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Angular motion of a star about its axis
Stellar rotation is the angular motion of a star about its axis. The rate of rotation can be measured from the spectrum of the star, or by timing the
Stellar_rotation
Rotation of Earth around its axis
Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space
Earth's_rotation
Magnetic field generated inside a star
Measurements of the time variation in stellar activity can be useful for determining the differential rotation rates of a star. A star with a magnetic
Stellar_magnetic_field
Variations in rotation rates
rotation affects stellar optical absorption-line spectra through line broadening caused by lines being differently Doppler-shifted across the stellar
Differential_rotation
Movement of an object which leaves at least one point unchanged
Rotation, also known as rotational motion or rotary motion, is the movement of an object that leaves at least one point unchanged. In 2 dimensions, a plane
Rotation
Changes to stars over their lifespans
composition and energetics Stellar population – Grouping of stars by similar metallicity (metallicity) Stellar rotation § After formation – Angular motion
Stellar_evolution
Creation of chemical elements within stars
In astrophysics, stellar nucleosynthesis is the creation of chemical elements by nuclear fusion reactions within stars. Stellar nucleosynthesis has occurred
Stellar_nucleosynthesis
Time that it takes to complete one rotation relative to the background stars
Rotation (astronomy) Rotational speed Stellar rotation Synodic day See Solar rotation for more detail. This rotation is negative because the pole which points
Rotation_period_(astronomy)
American astronomer (1927–2015)
American astronomer. He performed pioneering work on Cepheid variables, stellar rotation, novae, and the chemical evolution of the Milky Way. His name is also
Robert_Kraft_(astronomer)
Single yellow-hued star in the constellation Cetus
negative), c (whose weakly defined apparent signal was correlated to stellar rotation), and d (which did not show up in all data sets). Instead, they found
Tau_Ceti
American astronomer (1925–1999)
astronomy department there. His principal research interests were in stellar rotation and Be stars, and he published over 90 papers, abstracts and articles
Arne_Slettebak
Outermost layer of a star's atmosphere
Scientists have greater access to the solar corona than they do to other stellar coronae, since it is inside our solar system. This means that the coronae
Stellar_corona
Study of the movement of stars
impetus for its stellar motion. Examples of using kinematics combined with modeling to construct an astrophysical system include: Rotation of the Milky Way's
Stellar_kinematics
Timekeeping system on Earth relative to the celestial sphere
the stellar day, Earth's actual period of rotation relative to the fixed stars. The slightly longer stellar period is measured as the Earth rotation angle
Sidereal_time
Observed discrepancy in galactic angular momenta
The rotation curve of a disc galaxy (also called a velocity curve) is a plot of the orbital speeds of visible stars or gas in that galaxy versus their
Galaxy_rotation_curve
Triple star system in the constellation Eridanus
caused by a planetary companion. The 42-day period is close to the stellar rotation period, which made the possible planetary nature of the signal difficult
40_Eridani
Star whose brightness fluctuates, as seen from Earth
understood, being variously ascribed to pulsations, binarity, and stellar rotation. Mira variables Mira variables are aging red giant stars nearing the
Variable_star
physics Stellar planetary Stellar population Stellar precession Stellar pulsations Stellar quake Stellar radius Stellar remnant Stellar rotation Stellar scintillation
List_of_stellar_properties
Large self-illuminated object in space
magnetic field can act upon a star's stellar wind, functioning as a brake to gradually slow the rate of rotation with time. Thus, older stars such as
Star
Catalogue of rotational velocities of the stars is the name for catalogue of projected stellar rotation, published in 1982 by Uesugi, A. and Fukuda, I
Catalogue of rotational velocities of the stars
Catalogue_of_rotational_velocities_of_the_stars
Alpha-enhanced stars with young age indicators
evolved stars (dwarfs and subgiants), where lithium abundances and stellar rotation provide additional age diagnostics. The central question is whether
Alpha-enhanced stars with anomalous ages
Alpha-enhanced_stars_with_anomalous_ages
Chemical element with atomic number 11 (Na)
because interstellar lines are much narrower than those broadened by stellar rotation. Sodium has also been detected in numerous Solar System environments
Sodium
Classification of stars based on spectral properties
In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is
Stellar_classification
Nearest star to the Solar System
red dwarf is expected to steadily wane over billions of years as its stellar rotation rate decreases. The activity level appears to vary with a period of
Proxima_Centauri
Binary star system whose component stars are very close
93..133K. doi:10.1086/144252. Tassoul, Jean Louis; et al. (2000). Stellar Rotation. Cambridge, UK, New York: Cambridge University Press. p. 231. ISBN 0-521-77218-4
Contact_binary
Astronomical phenomenon due to the gravitational lens effect
objects like brown dwarfs and black holes, study starspots, measure stellar rotation, and probe quasars including their accretion disks. Microlensing was
Gravitational_microlensing
Type of neutron star with beams of radiation
appearance of emission. Neutron stars are very dense and have short, regular rotational periods. This produces a very precise interval between pulses that ranges
Pulsar
Constellation straddling the celestial equator
BVRI synthetic photometry. Influence of interstellar extinction and stellar rotation". Astronomy and Astrophysics. 388: 309–319. arXiv:astro-ph/0203341
Ophiuchus
Russian-American astronomer (1897–1963)
Struve's research was mostly focused on binary and variable stars, stellar rotation and interstellar matter. He was one of the few eminent astronomers
Otto_Struve
Subdwarf star in the constellation Pictor
fraction (1/3) of their estimated stellar rotation period, and thus the planetary signal is most likely an artifact of stellar activity. The authors did not
Kapteyn's_Star
Long-period gas giant orbiting 109 Piscium
astrometry. The inclination estimate is consistent with that of the stellar rotation. 54 Piscium b – another nearby planet in the constellation of Pisces
109_Piscium_b
Scatter plot of stars showing the relationship of luminosity to stellar classification
difficult; it is known to be a function of stellar composition and can be affected by other factors like stellar rotation. When converting luminosity or absolute
Hertzsprung–Russell_diagram
Study of how astronomical objects change with time
which results from eclipses (in binary stars, planetary transits), stellar rotation (in pulsars, spotted stars), or gravitational microlensing events.
Time-domain_astronomy
Subfield of astronomy
(astrophysics) – Measure of disorder in stellar interiors driving convection. Moment of inertia factor – Normalizes stellar rotation rates for evolution models. Photo-meson
Outline_of_astrophysics
Strong explosion observed on stars
interpreted as evidence of starspots carried around by stellar rotation. This allows an estimate of the rotation period of the star; values range from less than
Superflare
Star in the constellation Vela
previous estimates of the stellar rotation period. This indicates that the signal is very likely to be caused by the stellar rotation, rather than an orbiting
HD_85512
Star system in the Centaurus constellation
12300+200 −100 AU. Asteroseismic studies, chromospheric activity, and stellar rotation (gyrochronology) are all consistent with the Alpha Centauri system
Alpha_Centauri
Star system in the constellation Taurus
0D. Fritzewski, D. J.; Kemp, A.; Li, G.; Aerts, C. (2026). "Probing stellar rotation in the Pleiades with gravity-mode pulsators". Astronomy & Astrophysics
Alcyone_(star)
Spectroscopic phenomenon in astronomy
are involved. J. R. Holt in 1893 proposed a method to measure the stellar rotation of stars by using radial velocity measurements. He predicted that when
Rossiter–McLaughlin_effect
Theory to explain slowing of a star's spin
young star's rotation and reducing centrifugal forces. Magnetic braking occurs as a result of ionized material captured by the stellar magnetic field
Magnetic_braking_(astronomy)
Methods for estimating the age of a star
in stellar age estimation, an attempt to identify within reasonable degrees of confidence what the age of a star is. These methods include stellar evolutionary
Stellar_age_estimation
across spectral line profiles due to the stellar rotation. The technique to reconstruct these structures on the stellar surface is called Doppler-imaging, often
Doppler_imaging
Collapsed core of a massive star
neutron stars are the second-smallest and second-densest known class of stellar objects. Neutron stars have a radius on the order of 10 kilometers (6 miles)
Neutron_star
Flow of gas ejected from the upper atmosphere of a star
A stellar wind is a flow of gas ejected from the upper atmosphere of a star. It is distinguished from the bipolar outflows characteristic of young stars
Stellar_wind
Star in the constellation Monoceros
the radial velocity signal was more likely to be an artifact of the stellar rotation. However, a 2022 study provided strong evidence for the existence of
CoRoT-7
Black hole formed by a collapsed star
A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a star. They have masses ranging from about five
Stellar_black_hole
Star that has a supergiant luminosity class, with a spectral type of F or G
Bibcode:2000A&A...353..287A. Meynet, G.; Maeder, A. (2000). "Stellar evolution with rotation. V. Changes in all the outputs of massive star models". Astronomy
Yellow_supergiant
Brightest star in the constellation of Carina
strengths indicate the size and luminosity of Canopus. When the effects of stellar rotation speed on spectral lines are accounted for, the MK spectral class of
Canopus
Star in the constellation Pavo
2002, but found a different periodicity of 7 days possibly due to stellar rotation. Zeta Herculis van Leeuwen, F. (2007), "Validation of the new Hipparcos
Phi2_Pavonis
American astrophysicist
Eric E.; Henry, Gregory W. (2011). "The Stellar-Activity-Rotation Relationship and The Evolution of Stellar Dynamos". The Astrophysical Journal. 743
Eric_Mamajek
Changed position of star vs background
Stellar parallax is the apparent shift of position (parallax) of any nearby star (or other object) against the background of distant stars. By extension
Stellar_parallax
luminosity. stellar designation stellar dynamics stellar envelope 1. The region within the volume of a star that transports energy from the stellar core to
Glossary_of_astronomy
Extrasolar planet in the constellation Cancer
period is close to the rotation period of 55 Cancri A, which led to the possibility that the 43-day period was caused by stellar rotation rather than a planet
55_Cancri_Ac
Branch of astrophysics
Stellar dynamics is the branch of astrophysics which describes in a statistical way the collective motions of stars subject to their mutual gravity. The
Stellar_dynamics
Orbits where planets may have liquid surface water
However, further analysis concluded that this claim was an artefact of stellar rotation and activity. On 6 January 2015, NASA announced the 1000th confirmed
Habitable_zone
Measurement and interpretation of the polarization of transverse waves
dust in the interstellar medium, supernovae, gamma-ray bursts, stellar rotation, stellar magnetic fields, debris disks, reflection in binary stars and
Polarimetry
NASA satellite of the Explorer program
TRICERATOPS, DAVE, Lightkurve, Eleanor and Planet Patrol. TESS can estimate stellar rotation rates (which correlate with age), to find populations of similar age
Transiting Exoplanet Survey Satellite
Transiting_Exoplanet_Survey_Satellite
Skumanich and on the Skumanich Law, see: https://skumanich.wdrc.org and Stellar rotation. Magocsi, Paul Robert and Ivan Pop (2005). Encyclopedia of Rusyn History
List_of_Rusyn_Americans
3847/1538-4357/ad6b0d. Kraft, R. P. (1967), "Studies of Stellar Rotation. V. The Dependence of Rotation on Age among Solar-Type Stars", Astrophysical Journal
Kraft_break
Investigative astrophysics technique
lines formed in the stellar atmosphere (the Zeeman effect). The periodic modulation of Zeeman signatures during the stellar rotation is employed to make
Zeeman–Doppler_imaging
Contested super-Earth orbiting Gliese 581
their habitable zones may have orbital periods coinciding with the stellar rotation period (or in rare cases, such as Gliese 581d, half of it, if the standard
Gliese_581d
Grouping of stars by similar metallicity
1944, Walter Baade categorized groups of stars within the Milky Way into stellar populations. In the abstract of the article by Baade, he recognizes that
Stellar_population
Star in the constellation Draco, orbited by eight planets
Goldstein, Eyal S. (2015). "Photometric Amplitude Distribution of Stellar Rotation of KOIs—Indication for Spin-Orbit Alignment of Cool Stars and High
Kepler-90
List of largest planets by size
(2016). "Rossiter–Mc Laughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems". Monthly Notices of the Royal
List_of_largest_exoplanets
considered to be a false positive detection, an artifact caused by stellar rotation. Astrobiology Circumstellar habitable zone Habitability of G-type main-sequence
Habitability of K-type main-sequence star systems
Habitability_of_K-type_main-sequence_star_systems
Gravitational process studied in astronomy
within molecular clouds in interstellar space—sometimes referred to as "stellar nurseries" or "star-forming regions"—collapse and form stars. As a branch
Star_formation
Situation in which an astronomical object's orbital period matches its rotational period
change in its rotation rate over the course of a complete orbit. In the case where a tidally locked body possesses synchronous rotation, the object takes
Tidal_locking
GRAVITY is an instrument on the Very Large Telescope
sub-microarcsecond differential astrometry of β Pictoris, which showed that the stellar rotation axis is aligned with the warped inner disk and not with the outer disk
GRAVITY (Very Large Telescope)
GRAVITY_(Very_Large_Telescope)
Canadian astrophysicist
astrophysicist Subrahmanyan Chandrasekhar. Her thesis topic was multi-layered stellar atmospheres and contained the first model for this phenomenon. From 1948
Anne_Barbara_Underhill
M type star in the constellation Leo
star was found to rotate with the same period, suggesting that the stellar rotation may be the cause of the radial velocity signal, but it was thought
AD_Leonis
Structure of stars
Grids of Stellar Evolution Models (some of them including rotational induced mixing) The BaSTI database of stellar evolution tracks Stellar atmospheres:
Stellar_structure
Candidate gas giant exoplanet orbiting Pollux
might be the cause of the observed radial velocity variations. The stellar rotation period was found to be close to the proposed period of Pollux b, casting
Pollux_b
Type of emission nebula created by dying red giants
perhaps a few tens of millennia, compared to considerably longer phases of stellar evolution. Once all of the red giant's atmosphere has been dissipated,
Planetary_nebula
Binary star in the constellation Cepheus
paper which favoured K-giant variability with a period equal to the stellar rotation, but in 2002, the existence of a planet with an orbital period of about
Gamma_Cephei
Time of one rotation around a planet axis
of 60 seconds. A sidereal day or stellar day is the span of time it takes for the Earth to make one entire rotation with respect to the celestial background
Day
Star in the constellation Cancer
if the variations are caused by a planet or a magnetic cycle. The stellar rotation of HIP 41378 appears to be misaligned relative to the orbit of HIP
HIP_41378
Hypothesis proposing a modification of Newton's laws
mapped in detail the rotation velocities of stars in a large sample of spirals. While Newton's Laws predict that stellar rotation velocities should decrease
Modified_Newtonian_dynamics
Binary star system in the constellation Vulpecula
(2007). "The Transit Light Curve Project. V. System parameters and stellar rotation period of HD 189733". The Astronomical Journal. 133 (4): 1828–1835
HD_189733
Hypothetical class of star that develops from a red dwarf
Simulations have been conducted on the future evolution of red dwarfs with stellar mass between 0.06 M☉ and 0.25 M☉. Of the masses simulated, the bluest of
Blue_dwarf_(red-dwarf_stage)
Variable B-type star in the constellation Pegasus
30 G with the stellar rotation. The most probable rotational period is P_rot = 6.6538 ± 0.0016 days. Both the orbital and the rotational periods are integral
Gamma_Pegasi
Second brightest star in the southern constellation of Pictor
Observations with GRAVITY+ did show that the position angle (PA) of the stellar rotation is 32.09°±0.9° (east of north), which is better aligned with the inner
Beta_Pictoris
Star in the constellation Eridanus
existence. The 40-day radial velocity signal may instead be tied to the stellar rotation. The additional three candidates found in 2017 (e, f, g) could not
82_G._Eridani
Extrasolar planet in the constellation Monoceros
orbiting the star CoRoT-4. It is probably in synchronous orbit with stellar rotation. It was discovered by the French CoRoT mission in 2008. Moutou, C.;
CoRoT-4b
Galaxy containing the Solar System
Retrieved November 11, 2011. ^ Sauer, EGF (July 1971). "Celestial Rotation and Stellar Orientation in Migratory Warblers". Science 30: 459–461. "Reconciliation"
Milky_Way
Star in the constellation of Hercules
ISSN 0004-637X. Kraft, Robert P. (November 1967). "Studies of Stellar Rotation. V. The Dependence of Rotation on Age among Solar-Type Stars". The Astrophysical Journal
HD_162826
Star in the Ursa Major constellation
65..219H. doi:10.1086/126602. Mittag, M.; et al. (November 2017). "Stellar rotation periods determined from simultaneously measured Ca II H&K and Ca II
61_Ursae_Majoris
Binary star with at least five exoplanets 41 light-years away
this was close to the star's rotation period, which raised the possibility that the 43-day signal was caused by stellar activity. This possible planet
55_Cancri
tightens the mass estimate of GJ 3090 b and detects a planet near the stellar rotation period". Astronomy & Astrophysics. 706: A278. arXiv:2601.09330. Bibcode:2026A&A
List of exoplanets discovered in 2026
List_of_exoplanets_discovered_in_2026
Stream of ionized matter flowing away from a rotating astronomical object
narrow streams in opposite directions, aligned with the object's axis of rotation. When the matter in these streams is flowing at close to the speed of light
Astrophysical_jet
Triple star system in the constellation of Lyra
Mazeh, Tsevi; et al. (2015). "Photometric Amplitude Distribution of Stellar Rotation of KOIs—Indication for Spin-Orbit Alignment of Cool Stars and High
Kepler-444
Open star cluster in the constellation Cassiopeia
Twarog, Bruce A. (2026). "WOCS XCV: NGC 7789: The Evolution of Li, Stellar Rotation, and Extended Main-sequence Turnoff". The Astronomical Journal. 171:
NGC_7789
have longer rotational braking times (timescale for stellar rotation to slow), and show stronger activity based on their period of rotation. Deducing the
Stellar influences on an origin of life setting
Stellar_influences_on_an_origin_of_life_setting
Stellar classification distinguished by bright blue luminosity
Acrux. This class of stars was introduced with the Harvard sequence of stellar spectra and published in the Revised Harvard photometry catalogue. The
B-type_main-sequence_star
of the Crimean Astrophysical Observatory, co-developed a method for stellar rotation measurement Iosif Shklovsky, prominent radio astronomer, cosmic rays
List_of_Russian_people
Possible factors for life around red dwarf stars
near the stellar poles; if an exoplanet's orbit is aligned with the stellar rotation (as is the case with the planets of the Solar System), then it is less
Habitability of red dwarf systems
Habitability_of_red_dwarf_systems
Classification in astronomy
Since most compact object types represent endpoints of stellar evolution, they are also called stellar remnants, and accordingly may be called dead stars
Compact_object
Wave in general relativity
halos, offering an alternative explanation for the anomalies found in stellar rotation curves. Furthermore, gravisolitons are capable of deflecting light
Gravitational_soliton
Astrophysical Observatory, co-developed a method for measurement of stellar rotation Iosif Shklovsky, astronomer and astrophysicist, author of several discoveries
List_of_Russian_scientists
Astrophysical Observatory, co-developed a method for measurement of stellar rotation Inna Shcherbina-Samoylova, astronomer and astrophysicist, specialist
List of Russian astronomers and astrophysicists
List_of_Russian_astronomers_and_astrophysicists
Star in the constellation Virgo
period about 12 years. 59 Virginis has an unusually high stellar rotation velocity and stellar activity, which led some astronomers to believe that it
59_Virginis
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