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Grouping of stars by similar metallicity
Walter Baade categorized groups of stars within the Milky Way into stellar populations. In the abstract of the article by Baade, he recognizes that Jan
Stellar_population
Topics referred to by the same term
for some question or experiment Stellar population, categorized groups of stars within the Milky Way World population, total number of living humans on
Population
Rotational center of the Milky Way galaxy
center is suspected to have a large population of stellar mass black holes. There are probably around 25,000 stellar mass black holes in the central parsecs
Galactic_Center
Changes to stars over their lifespans
Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few
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
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
American astrophysicist
Astronomical Union. Rich pioneered the modern study of the central bulge/bar stellar population of the Milky Way galaxy, obtaining the first spectroscopy and metal
R._Michael_Rich
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
Irregular dwarf galaxy in the constellation Cetus
found five cepheids of Population II in IC 1613, giving self-evident support for the existence of a very old stellar population component of IC 1613. In
IC_1613
Study of the movement of stars
In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space. Stellar kinematics encompasses
Stellar_kinematics
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
Large self-illuminated object in space
affects the strength of its stellar wind. Older, population II stars have substantially less metallicity than the younger, population I stars due to the composition
Star
Type of star larger than main-sequence but smaller than a giant
Cassisi, Santi (2005). "Evolution of Stars and Stellar Populations". Evolution of Stars and Stellar Populations: 400. Bibcode:2005essp.book.....S. Pols, Onno
Subgiant
Component of disc galaxies comprising gas and stars
a stellar component (composed of most of the galaxy's stars) and a gaseous component (mostly composed of cool gas and dust). The stellar population of
Galactic_disc
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
Study of the chemical composition and chemical processes in stars
among different stellar populations: Population I stars (e.g., the Sun) are metal‑rich and predominantly found in galactic disks. Population II stars are
Stellar_chemistry
Structure of stars
Stellar structure models describe the internal structure of a star in detail and make predictions about the luminosity, the color and the future evolution
Stellar_structure
Star in its early stage of evolution
Young stellar object (YSO) denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence
Young_stellar_object
Relative abundance of heavy elements in a star or other astronomical object
different populations of stars. These became commonly known as population I (metal-rich) and population II (metal-poor) stars. A third, earliest stellar population
Metallicity
Extremely faint candidate satellite galaxy of the Milky Way
The Astrophysical Journal in January 2024. It contains a metal-poor stellar population, indicating an extreme age of 11 billion years. Located about 32,600
Ursa_Major_III
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
Type of emission nebula created by dying red giants
elements. Known examples are the metal poor Population II stars. (See Stellar population.) Identification of stellar metallicity content is found by spectroscopy
Planetary_nebula
Coming together of two stars
A stellar collision is the coming together of two stars caused by stellar dynamics within a star cluster, or by the orbital decay of a binary star due
Stellar_collision
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)
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
Barred spiral galaxy in the Local Group
than the Sun, but still a fraction of the galaxy's total estimated stellar population. The estimated distance of the Andromeda Galaxy from our own was doubled
Andromeda_Galaxy
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
Curve on the Hertzsprung-Russell diagram representing stars of a particular age
In stellar evolution, an isochrone is a curve on the Hertzsprung-Russell diagram, representing a population of stars of the same age but with different
Stellar_isochrone
Star not gravitationally bound to any galaxy
intergalactic stars are referred to as the intracluster stellar population, or IC population for short, in the scientific literature. The hypothesis that
Intergalactic_star
Region at the center of a star
A stellar core is the extremely hot, dense region at the center of a star. For an ordinary main sequence star, the core region is the volume where the
Stellar_core
Outer region of the volume of a star
The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone. The stellar atmosphere
Stellar_atmosphere
Process where a red giant star engulfs a planet
Stellar engulfment is the process in which a star at the end of its main sequence phase of its life expands into a red giant star and engulfs some or
Stellar_engulfment
Spherical collection of stars
reveals multiple stellar populations as indicated by the presence of closely separated curves, each corresponding to a distinct population of stars with
Globular_cluster
Main sequence star that is more luminous and bluer than expected
across metal poor stellar populations. The identification of blue stragglers among field stars however is more difficult than in stellar clusters, because
Blue_straggler
Constellation in the southern celestial hemisphere
globular cluster discovered by James Dunlop on May 28, 1826. Its stellar population is inhomogeneous, varying with distance from the core. The effective
Vela_(constellation)
One of the most massive and metal-rich blueberry galaxies
often associated with dust with a range from dense to porous. Its stellar population is a mix of old, intermediate and massive young stars such as massive
SHOC_579
Astrophysical phenomenon
(2001). "The Influence of Binaries on Stellar Population Studies". Influence of Binaries on Stellar Population Studies. Astrophysics and Space Science
Supernova
Dwarf irregular galaxy
of 2,000 light years. The stellar population of this galaxy consist of old metal-poor AGB branch stars with a small population of slightly more metal-rich
PGC_2933
Faint irregular dwarf galaxy in the local group
in gas, Antlia B shows no evidence of active star formation. The stellar population of Antlia B is composed of prominent old, metal-poor red giant branch
Antlia_B
typically around 6.5 apparent magnitude. The known 133 objects are bound in 95 stellar systems. Of those, 103 are main sequence stars: 78 red dwarfs and 25 "typical"
List_of_nearest_stars
Galaxy morphology classification
compact progenitor in the heart of NGC 3311 revealed with MUSE 2D stellar population analysis". Astronomy & Astrophysics. 649: 19. arXiv:2012.11609. Bibcode:2021A&A
Type-cD_galaxy
Galaxy undergoing an exceptionally high rate of star formation
a galaxy and the youth of its stellar population, with more lopsided galaxies having younger central stellar populations. As lopsidedness can be caused
Starburst_galaxy
2015 composite photograph
than the Sun, but still a fraction of the galaxy’s total estimated stellar population. This new mosaic was the result of the December 2021 to January 2024
Zooming In on the Andromeda Galaxy
Zooming_In_on_the_Andromeda_Galaxy
Dwarf galaxy in the constellation of Sagittarius
intermediate-age population of stars. Twenty-seven candidate carbon stars have been identified inside SagDIG. Analysis shows that the underlying stellar population of
Sagittarius Dwarf Irregular Galaxy
Sagittarius_Dwarf_Irregular_Galaxy
Study of the Milky Way galaxy and its contents
open clusters and associations of stars Solar neighborhood – nearby stars stellar content – numbers and types of stars in the Milky Way structure – the structure
Galactic_astronomy
Galaxy in the constellation Vela
have different colors, suggesting different stellar populations. The eastern tail has mean stellar population age determined to be 841+125−157 Myr and a
NGC_3256
Quasar in the constellation Cetus
its regions with a steeper blue continuum spectrum, it has a young stellar population of stars aged between 180 and 290 million years old. These stars are
Markarian_1014
Succession of methods by which astronomers determine the distances to celestial objects
clusters. The following four indicators all use stars in the old stellar populations (Population II): Tip of the red-giant branch (TRGB) distance indicator
Cosmic_distance_ladder
Magnetic field generated inside a star
A stellar magnetic field is a magnetic field generated by the motion of conductive plasma inside a star. This motion is created through convection, which
Stellar_magnetic_field
Isolated dwarf galaxy
and KKR25. It shows no sign of recent star formation and has an old stellar population. Hedgehog is most likely to originate from the Cen A group, given
Hedgehog_(galaxy)
point of light seen from the Earth. More globally, statistics on stellar populations seem to indicate that the upper mass limit is in the 120-solar-mass
List_of_most_massive_stars
Unexplained gamma rays from the Galactic Center
hypotheses include ties to a yet unseen population of millisecond pulsars or young pulsars, burst events, the stellar population of the galactic bulge, or the Milky
Galactic_Center_GeV_excess
Galaxy with an annular appearance
processes that form ring galaxies appear to cause significant effects on stellar populations. Based on observations of the spectrum of the ring structures, there
Ring_galaxy
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
Spiral galaxy in the constellation Coma Berenices
The inner disk contains the prominent dust lanes of the galaxy. The stellar population of the galaxy exhibits no measurable counter-rotation. Possible formation
Black_Eye_Galaxy
Measure of a civilization's evolution
would then be the Galactic Center, due to the high density of the stellar population it harbors. He then recommended that the search programs for such
Kardashev_scale
Set of non-stellar objects in orbit around a star
A planetary system consists of a set of non-stellar bodies which are gravitationally bound to and in orbit of a star or star system. Generally speaking
Planetary_system
Scientist
Florida Atlantic University. Sarajedini's research focuses on resolved stellar populations in galaxies, pulsating variable stars, globular clusters and open
Ata_Sarajedini
List of the hottest known stars
T.; Sander, A. A. C.; Todt, H.; Gallagher, J. S. (2018-07-01). "Stellar population of the superbubble N 206 in the LMC. II. Parameters of the OB and
List_of_hottest_stars
Astronomical object without the mass to sustain hydrogen fusion
enough mass to fuse hydrogen and helium, hence do not undergo the usual stellar evolution that limits the lifetime of stars. A substellar object with a
Substellar_object
Process by which stars are named
In astronomy, stars have a variety of different stellar designations and names, including catalogue designations, current and historical proper names
Stellar designations and names
Stellar_designations_and_names
Elliptical galaxy in the constellation Virgo
M86 galaxy is more similar to the rest of the universe than its own stellar population. This suggests that even ram pressure stripping is insufficient to
Messier_86
Low-surface brightness Milky Way satellite dwarf galaxy in the constellation Eridanus
Eridanus II, they attributed 94% (~5.6 ± 1.5 × 104 L☉) to the old stellar population, and 6% (~3.5 ± 3 × 103 L☉) to the intermediate-age stars. Li et al
Eridanus_II
Low-luminosity galaxy of old stars and little dust
small, low-luminosity galaxies with very little dust and an older stellar population. They are found in the Local Group as companions to the Milky Way
Dwarf_spheroidal_galaxy
Star-forming region in the constellation Orion
complex (or, simply, the Orion complex) is a star-forming region with stellar ages ranging up to 12 Myr. Two giant molecular clouds are a part of it
Orion_molecular_cloud_complex
Type of stellar system
and star-forming regions within a few kpc, with no sign of an older stellar population. There is nothing in the vicinity of these blue blobs, as they are
Blue_blob
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
1051/0004-6361:20041280. S2CID 56424665. Jones, Olivia (2017). "Near-infrared Stellar Populations in the Metal-poor, Dwarf Irregular Galaxies Sextans a and Leo A"
List_of_coolest_stars
Diagram of stars in astronomy
of the Hertzsprung–Russell diagram for a given galaxy or resolved stellar population. The diagram is named after R. Hess who originated it in 1924. Its
Hess_diagram
Small number of stars that orbit each other
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction. It may sometimes be used to refer
Star_system
Early stage in the process of star formation
its parent molecular cloud. It is the earliest phase in the process of stellar evolution. For a low-mass star (i.e. that of the Sun or lower), it lasts
Protostar
physics Stellar planetary Stellar population Stellar precession Stellar pulsations Stellar quake Stellar radius Stellar remnant Stellar rotation Stellar scintillation
List_of_stellar_properties
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
Dim, low mass stars on the main sequence
definition is synonymous with stellar M dwarfs, yielding a maximum temperature of 3,900 K and 0.6 M☉. Another includes all stellar M-type main-sequence and
Red_dwarf
Open cluster in the constellation Taurus
A.; Silvotti, R. (2019-02-27). "A 3D view of the Hyades stellar and sub-stellar population". Astronomy & Astrophysics. 623: A35. arXiv:1901.07534. Bibcode:2019A&A
Hyades_(star_cluster)
Theoretical stellar remnant
A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently to no longer emit significant heat or light. Because
Black_dwarf
Hypothetical compact star
conserved particle number. A Q-star may be mistaken for a stellar black hole. Some stellar black holes might be grey holes, two of which are V404 Cygni
Q_star
Group of stars
move in broadly the same direction through space and are then known as stellar associations, sometimes referred to as moving groups. Globular clusters
Star_cluster
Emission nebula in the constellation Monoceros
et al. (2015). "The Spatial Structure of Young Stellar Clusters. II. Total Young Stellar Populations". Astrophysical Journal. 802 (1): 60. arXiv:1501
Rosette_Nebula
Star-containing portion of a galactic halo
resolved stellar populations. Individual resolved stars in stellar halos can only be measured in the Milky Way and Andromeda. The furthest stellar halos
Stellar_halo
Open cluster in the Perseus constellation
1193 is usually classified as a Trumpler type II3m, indicating its stellar population have a wide range of brightness, from very bright to faint stars and
NGC_1193
Mass of a star in astronomy
Stellar mass is a phrase that is used by astronomers to describe the mass of a star. It is usually enumerated in terms of the Sun's mass as a proportion
Stellar_mass
Galaxy in the constellation Aries
substantial, corresponding to a mass-to-light ratio of about 650. The stellar population of Segue 2 consists mainly of old stars formed more than 12 billion
Segue_2
Stars with strong methylidyne absorption bands in their spectra
bands due to CH (methylidyne) in their spectra. They belong to the stellar population II, meaning they are metal poor and generally pretty middle-aged stars
CH_star
Star forming region in the constellation Chamaleon
pre-main sequence (PMS) stars have drifted into the field. The total stellar population is 200–300. The Cha I cloud is further divided into the North cloud
Chamaeleon_Cloud
Hypothetical early-universe star with a black hole core
resulted from the core of a large supermassive protostar collapsing into a stellar-mass black hole, where the outer layers of the protostar are massive enough
Quasi-star
Rare star with tremendous luminosity and high rates of mass loss by stellar winds
Negueruela, I.; Crowther, P. A.; Goodwin, S. P. (2005). "On the massive stellar population of the super star cluster Westerlund 1". Astronomy and Astrophysics
Hypergiant
Open cluster in the constellation Gemini
1600 and 3200 solar masses, consistent with the mass of a realistic stellar population within the same radius. Bouy et al. in 2015 found a mass of around
Messier_35
second brightest is Sirius at −1.46 mag. For comparison, the brightest non-stellar objects in the Solar System have maximum brightnesses of: Moon −12.7 mag
List_of_brightest_stars
Type of starburst galaxy
starburst galaxies that have very high ionization rates and some of the lowest stellar masses and metallicities. They are smaller counterparts of Green Pea galaxies
Blueberry_galaxy
Reflection nebula in the constellation Perseus
previous observations in most star-forming regions and the nearby stellar population. One source, called NIRISS-NGC1333-5 (NN5), shows infrared excess
NGC_1333
Galaxy in the constellation Hydra
Coccato, L.; Gerhard, O.; Arnaboldi, M.; Ventimiglia, G. (2011-09-01). "Stellar population and the origin of intra-cluster stars around brightest cluster galaxies:
NGC_3311
Dwarf irregular galaxy in the constellation of Pegasus
M. (1998). "A Wide Field Planetary Camera 2 Study of the Resolved Stellar Population of the Pegasus Dwarf Irregular Galaxy (DDO 216)". The Astronomical
Pegasus Dwarf Irregular Galaxy
Pegasus_Dwarf_Irregular_Galaxy
Possible type of luminous blue compact galaxy
Peas show an extended, old stellar population underlying the young starbursts, like those typically dominant in terms of stellar mass in most Blue Compact
Pea_galaxy
Globular cluster in Ophiuchus
the mass of the Sun and it is around 11.9 billion years old. The stellar population includes four Cepheids and RV Tauri variables, plus at least one RR
Messier_19
Emission nebula in the constellation Carina
1051/0004-6361/202141770. Persi, P.; et al. (February 1994). "The young stellar population associated with the HII region NGC 3576". Astronomy and Astrophysics
NGC_3576
Galaxy located in Boötes
e−t ) and also a delayed function (SFR ∝ t × e−t ) as well as the stellar population libraries written from Bruzual & Charlot and Convoy et al. Several
UGC_9684
Number of stars within a unit volume
Stellar density is the average number of stars within a unit volume. It is similar to the stellar mass density, which is the total solar masses (MSun)
Stellar_density
Spiral-shaped regions of enhanced brightness within the galactic disc in spiral galaxies
While spiral arms are primarily identifiable due to their young stellar population, there also exists an increased concentration of old stars within
Spiral_arm
Red supergiant star in the constellation Orion
"New Generation Stellar Spectral Libraries in the Optical and Near-infrared. I. The Recalibrated UVES-POP Library for Stellar Population Synthesis". The
Betelgeuse
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