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Variable stars of late spectral types
BY Draconis variables are variable stars of late spectral types, usually K or M, and typically belong to the main sequence. The name comes from the archetype
BY_Draconis_variable
Variable star in the constellation Draco
4 Draconis, also known as HR 4765 and CQ Draconis, is a star about 570 light years from the Earth, in the constellation Draco. It is a 5th magnitude star
4_Draconis
Star in the constellation Draco
(CMEs). EK Draconis is classified as a BY Draconis variable, exhibiting brightness variations due to large starspots and rapid rotation. EK Draconis is a G-type
EK_Draconis
Star in the constellation Draco
General Catalogue of Variable Stars, at least one of the components is a flare star and at least one is a BY Draconis variable. The white dwarf star
CM_Draconis
Star in the constellation Draco
a class of variable stars known as BY Draconis variables. The third component (C) is, by comparison, widely separated from the A-B pair by an angular
BY_Draconis
Star in the constellation of Draco
from the Sun, it is one of the 200 or so closest stars. Chi Draconis (Latinized from χ Draconis, abbreviated χ Dra, Chi Dra) is the star system's Bayer designation
Chi_Draconis
Star in the constellation Draco
Iota Draconis (ι Draconis, abbreviated Iota Dra, ι Dra), also named Edasich /ˈɛdəsɪk/, is a star in the northern circumpolar constellation of Draco. A
Iota_Draconis
Star in the constellation Draco
since earlier observations. It was given the variable star designation AG Draconis in 1964. AG Draconis spends most of its time in a quiescent phase near
AG_Draconis
Star system in the constellation Pictor
secondary star is a K-type star. The primary star is a young BY Draconis variable, a class of variable stars that derive their variability from stellar rotation
AK_Pictoris
Binary star system in the constellation Draco
Beta Draconis (β Draconis, abbreviated Beta Dra, β Dra) is a binary star system and the third-brightest star in the northern circumpolar constellation
Beta_Draconis
Subdwarf star in the constellation Pictor
metallicity, is about 14% of the abundance in the Sun. It is a variable star of the BY Draconis type with the identifier VZ Pictoris. This means that the luminosity
Kapteyn's_Star
Binary star in the constellation of Draco
YY Draconis and DO Draconis are separate identifiers for what is likely the same cataclysmic variable system in the northern constellation of Draco, abbreviated
DO_Draconis/YY_Draconis
Star in the constellation Andromeda
attributed to spots on its photosphere as it rotates, a class known as BY Draconis variables. Examining the proper motion of Ross 248 has found no evidence of
Ross_248
Sextuple star system in Gemini
lines of certain metals. Castor C is a variable star, classified as a BY Draconis type. BY Draconis variables are cool dwarf stars which vary as they
Castor_(star)
Variable star in the constellation Draco
Omicron Draconis (Latinised as ο Draconis, abbreviated to ο Dra) is a giant star in the constellation Draco located 322.93 light years from the Earth
Omicron_Draconis
Star in the constellation Coma Berenices
111395 is a variable star, in 1997. It was given its variable star designation in 2006. It is a BY Draconis variable that varies in brightness by about 0
HD_111395
Red dwarf star in the constellation Ophiuchus
the variable star designation V2500 Ophiuchi. In 2003, Barnard's Star presented the first detectable change in the radial velocity of a star caused by its
Barnard's_Star
Star in the constellation Libra
planets. Gliese 581 is classified as a variable star of the BY Draconis type, and has been given the variable star designation HO Librae. This is a star
Gliese_581
Star in the constellation Ursa Major
21185 is listed as a BY Draconis type variable star in the General Catalogue of Variable Stars. It is identified by the variable star designation NSV
Lalande_21185
Binary star system in the constellation Vulpecula
luminosity by 1.5 percent in visible light. As a result, in 2006 it was added to the General Catalogue of Variable Stars as a BY Draconis variable with the
HD_189733
Star in the constellation Aquarius
many low-mass stars, Gliese 876 is a variable star, classified as a BY Draconis variable. Its brightness fluctuates by around 0.04 magnitudes. This type
Gliese_876
Triple star system in the constellation Piscis Austrinus
astronomical nomenclature for a variable star. Fomalhaut B is a flare star of the type known as a BY Draconis variable. It varies slightly in apparent
Fomalhaut
Star whose brightness fluctuates, as seen from Earth
binary system. BY Draconis variable stars BY Draconis stars are a common type of variable with spectral class F, G, K or M that vary by less than 0.5 magnitudes
Variable_star
Constellation in the northern celestial hemisphere
starlight was discovered in 1728 when James Bradley observed Gamma Draconis. Nearby Beta Draconis, traditionally called Rastaban, is a yellow giant star of magnitude
Draco_(constellation)
Star in the constellation Cassiopeia
HR 511 (also designated V987 Cassiopeiae and Gliese 75 among others) is an orange dwarf of spectral type K0V in the constellation Cassiopeia. With an apparent
HR_511
Binary star system in the Cygnus constellation
is a characteristic of a BY Draconis variable. Because of differential rotation, this star's surface rotation period varies by latitude from 27 to 45 days
61_Cygni
Star in the constellation Boötes
the 'e' notation indicates emission lines in the spectrum. It is a BY Draconis variable with an apparent magnitude that varies from +4.52 to +4.67 with a
Xi_Boötis
Star in the constellation Cetus
brightness caused by starspots or chromospheric features moving as the star rotates. This class of variable stars are known as BY Draconis variables. The periodic
YZ_Ceti
Binary star in the constellation Cetus
are both flare stars with the variable star designations BL Ceti and UV Ceti. The star system was discovered in 1948 by Willem Jacob Luyten in the course
Gliese_65
Carbon-rich Mira variable star in Draco
T Draconis (abbreviated T Dra) is a carbon-rich Mira variable star located in the constellation Draco. The star's carbon-rich atmosphere produces a spectrum
T_Draconis
Star in the constellation Microscopium
Patrick Byrne discovered that it is a flare star, and it was given the variable star designation AX Microscopii, or AX Mic. As a flare star it is relatively
Lacaille_8760
Star in the constellation Orion
temperature is much cooler than the Sun's, about 3,330 K. It is a BY Draconis variable, a star which whose brightness varies across its rotation, having
Ross_47
Star in the constellation Piscis Austrinus
star designation. This is a variable star of the type known as a BY Draconis variable, with surface brightness variations causing the changes as the star
TW_Piscis_Austrini
Variable star in the Alpha Persei Cluster
to be variable. The star AP 70, later called V488 Persei was found to be variable with a period of 123.5 hours. The star is a BY Draconis variable, which
V488_Persei
Binary star in the constellation Draco
Epsilon Draconis, Latinized from ε Draconis, is a binary star in the constellation Draco, with a combined apparent magnitude of 3.84, it is the eleventh-brightest
Epsilon_Draconis
Star in the constellation Draco
Kappa Draconis, Latinized from κ Draconis, is a blue giant star located in the northern circumpolar constellation of Draco. At an apparent magnitude of
Kappa_Draconis
Star in the constellation Andromeda
variation period. KX Andromedae is thus classified as a BY Draconis variable, and the variability is caused by the large spots on the surface. "MAST: Barbara A
KZ_Andromedae
Star in the constellation Draco
Lambda Draconis (λ Draconis, abbreviated Lam Dra, λ Dra), also named Giausar (/ˈdʒɔːzɑːr/ JAW-zar), is a solitary, orange-red star in the northern circumpolar
Lambda_Draconis
Libra 14h 34m 16.8s −12° 31′ 10″ M4.0V 10.3–10.33 159.9225±0.0546 BY Draconis variable; has 1 known planet, 1 candidate EQ Pegasi (Gliese 896, BD+19 5116)
List of star systems within 20–25 light-years
List_of_star_systems_within_20–25_light-years
Red dwarf star in the constellation of Sculptor
0V by various sources. Gliese 1 is estimated to have 33% of the Sun's mass and 38% of the Sun's radius. This star is suspected of being a BY Draconis-type
Gliese_1
Star in the constellation Pyxis
star with a mild overabundance of iron in the spectrum. It is a BY Draconis variable with a period of 13.97 days, showing a variation of 0.03 in magnitude
HD_73256
Star in the constellation Ophiuchus
it possesses a dust ring. This star is categorized as a BY Draconis variable, with variable star designation V2133. The variability is attributed to
12_Ophiuchi
Sun-like star in the constellation of Gemini
HD 63991; the two are separated by a distance of 2.7 light years. HD 63433 belongs to the class of BY Draconis variables, stars that vary in brightness
HD_63433
Star in the constellation Taurus
HD 29697 (Gliese 174, V834 Tauri) is a variable star of BY Draconis type in the constellation Taurus. It has an apparent magnitude around 8 and is 43 ly
HD_29697
Star in the constellation Aquila
stellar classification of K1/2 V This is a BY Draconis variable, with variations in luminosity being caused by star spots on a rotating stellar atmosphere
HD_192263
Red dwarf star in the constellation Ophiuchus
(10): 195–219. Bibcode:1919VeHei...7..195W. "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 6 January 2022. "Astronomers
Wolf_1061
Star in the constellation Draco
Sigma Draconis is a single star in the northern constellation of Draco. It has the proper name Alsafi /ælˈseɪfi/, while Sigma Draconis, which is latinised
Sigma_Draconis
Star in the constellation of Draco
Thuban (/ˈθjuːbæn/), with Bayer designation Alpha Draconis or α Draconis, is a binary star system in the northern constellation of Draco. A relatively
Thuban
Star in the constellation Gemini
constellation Gemini, located 90 light years away from the Sun. It is a BY Draconis variable, a cool dwarf which varies rapidly in brightness as it rotates. The
V429_Geminorum
Constellation in the southern celestial hemisphere
orange dwarf that has 80% the size and mass of the Sun, it is also a BY Draconis variable. These are a class of stars with starspots prominent enough that
Mensa_(constellation)
Star in the constellation Libra
O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep
HN_Librae
Star in the constellation Serpens
to become a red giant. The star was once thought to be a BY Draconis variable with the variable star designation MQ Ser, but has been found not to be. From
5_Serpentis
Constellation in the northern celestial hemisphere
at a distance of 10.3 light-years. It is a red-hued main-sequence BY Draconis variable star of type M6. 14 And (Veritate) is a yellow-hued giant star of
Andromeda_(constellation)
Star in the constellation Cetus
that CD Ceti is a single star. CD Ceti is classified as a BY Draconis variable. These variables - among which DK Ceti and EX Ceti are found in the same
CD_Ceti
Star in the constellation Aquarius
Way. It is also known as Luyten 789-6, Gliese 866 and LHS 68. It is a variable star showing flares as well as smaller brightness changes due to rotation
EZ_Aquarii
K-type main sequence star in the constellation Vulpecula
et al. paper. It is now classified as a chromospherically active BY Draconis variable. The star has 97% of the mass of the Sun and 86% of the Sun's radius
HD_203030
Young flame star in the constellation of Orion
emission lines (e) in its spectrum. It is classified as a BY Draconis and UV Ceti variable, which means it is a magnetically active star that exhibits
V1005_Orionis
Quadruple star system in constellation Canis Major
G-type main sequence star with the spectral type G6.5V. It is a BY Draconis variable with a long brightness cycle lasting 11.7±0.5 years. Though estimates
HD_43162
Star in the constellation Pictor
part of the Carina association. The star has been classified as a BY Draconis variable, indicating it has an active chromosphere. It is an X-ray source
AB_Pictoris
Binary star in constellation Canes Venatici
DG Canum Venaticorum is a variable binary star system in the northern constellation of Canes Venatici. As of 2009, the pair have an angular separation
DG_Canum_Venaticorum
Star in the constellation Draco
Phi Draconis (φ Dra / φ Draconis) is a fourth-magnitude variable star in the constellation Draco. It has the Flamsteed designation 43 Draconis. It is also
Phi_Draconis
Young Sun-like star with a circumstellar disk
Science Institute. Retrieved 28 May 2025. "NZ Lup". The International Variable Star Index. AAVSO. Retrieved 28 May 2025. Marsden, S. C.; Jardine, M. M
HD_141943
Star in the constellation Andromeda
Andromeda, approximately 45 light-years away from Earth. It is a variable star of the BY Draconis type, varying between magnitudes 6.13 and 6.18 with a 6.23
HD_166
Star in the constellation Aquarius
effective temperature of 3,800 K. HK Aquarii is classified as a BY Draconis variable and has been observed ranging in brightness from visual magnitude
HK_Aquarii
Star in the constellation Eridanus
Eridani, such as those caused by an orbiting planet, more difficult. Epsilon Eridani is classified as a BY Draconis variable because it has regions of higher
Epsilon_Eridani
Star in the constellation Eridanus
type variable stars. This is an evolving subgiant star with a very slow rotation period of 308.8 days. It is classified as a BY Draconis variable that
EK_Eridani
Constellation in the southern celestial hemisphere
seen close by and is possibly associated with Fomalhaut as it lies within a light-year of it. Of magnitude 6.5, it is a BY Draconis variable. The second-brightest
Piscis_Austrinus
Triple star system in constellation Hercules
period of 25.7631 days without eclipses. The binary is a BY Draconis variable with the variable star designation V885 Herculis. The planetary orbits in
HD_165590
Star in the constellation Virgo
is classified as an eruptive variable of the UV Ceti type and a BY Draconis variable. It shows strong chromospheric activity with extensive star spots
EQ_Virginis
Star in the constellation Pisces
constellation Pisces at 19.3 light-years from Earth. It is a BY Draconis variable star with a variable star designation of BR Piscium. Its apparent magnitude
Gliese_908
Catalogue of Variable Stars (GCVS4.2)". Retrieved 10 April 2012. Samus, N. N.; Durlevich, O. V.; et al. (2012). "General Catalog of Variable Stars (GCVS
List_of_stars_in_Cassiopeia
Star in the constellation Perseus
Subsequently, it was classified as a RS Canum Venaticorum and BY Draconis variable by an automated program. This is probably a binary system with an
50_Persei
Star in the constellation Leo
358 from its entry in Max Wolf's star catalogue. Gliese 402 is a BY Draconis variable, with its apparent magnitude varying between 11.64 and 11.70. The
Gliese_402
Triple star system in the constellation Sagittarius
It was given its variable star designation, V4200 Sagittarii, in 1993. HR 7578 is a BY Draconis variable. This is a class of variable star whose variability
HR_7578
Visual binary in constellation Draco
It was formally classified as a BY Draconis variable in 1997, receiving the variable-star designation EW Draconis. Anderson, E.; Francis, Ch. (2012)
HD_147379
Star in the constellation Taurus
classified as a BY Draconis variable, cool stars with starspots and chromospheric activity that vary in brightness as they rotate. The variable period of 2
V830_Tauri
Star in the constellation Eridanus
group of stars that share a common motion through space. This is a BY Draconis variable with the designation IX Eridani, which ranges in magnitude from 5
58_Eridani
Star in the constellation Pegasus
days, which is caused by star spots that are modulated by the star's rotation period. MT Peg is classified as a BY Draconis variable. MT Peg is considered
MT_Pegasi
Binary star system in the constellation Draco
has the designation HD 174237 in the Henry Draper Catalogue; CX Draconis is the variable star designation. This is a double-lined spectroscopic binary system
CX_Draconis
Variable yellow dwarf star in the constellation Cetus
brightness varies by a few hundredths of a magnitude over a period of nine days and it is classified as a BY Draconis variable, a type of variable star where
Kappa1_Ceti
Star in constellation Auriga
discovery in 2000. The star was given its variable star designation in 2006. This is a BY Draconis variable, which means it undergoes changes in luminosity
V538_Aurigae
Overview of the scientific field of astronomy
Cataclysmic variable star Dwarf nova Nova Supernova Z Andromedae Rotating Non-spherical Ellipsoidal Stellar spots FK Comae Berenices BY Draconis variable Magnetic
Outline_of_astronomy
Star in the constellation Ursa Major
about 200 million years. It is classified as a BY Draconis type variable star and its brightness varies by 0.08 magnitudes. In 1986, it became the first
Pi1_Ursae_Majoris
Star in the constellation Telescopium
174429, is a variable star. It was given its variable star designation, PZ Telescopii, in 1981. It is classified as a BY Draconis variable that ranges
PZ_Telescopii
Star in the constellation Aquila
star with a stellar classification of K5 V. It is classified as a BY Draconis variable, showing a moderate level of magnetic activity in its chromosphere
HD_190007
Constellation in the southern celestial hemisphere
Pictoris is a BY Draconis variable star with a substellar companion that is either a large planet or a brown dwarf, which was discovered by direct imaging
Pictor
Star in the constellation Hydra
main-sequence star with a stellar classification of G1/2V. It is a BY Draconis variable that ranges in brightness from magnitude 8.66 down to 8.77 with a
HD_70573
Star in the constellation Pyxis
The system is classified as either a RS Canum Venaticorum variable or a BY Draconis variable, stars that vary on account of prominent starspot activity
TY_Pyxidis
Star in the constellation Pegasus
surface magnetic field of the star has a complex and variable geometry. It is a BY Draconis variable star with an active chromosphere, which means there
HN_Pegasi
Star in the constellation Crater
discovered to be variable in 1985 and is classified as a marginal BY Draconis variable, with an optical variability cycle of 11.58 days. The star causing
SZ_Crateris
Star in the constellation Leo
with a period of 4.45 days. It was suspected that the star was a BY Draconis variable due to the period paired with the X-ray and EUV emissions. This was
GQ_Leonis
Star in the constellation Lepus
times the mass of the Sun. The third component, AM Leporis, is a BY Draconis variable of apparent magnitude 9.92, and spectral type G8Ve at an angular
Iota_Leporis
Star in the constellation Boötes
HD 130948 or HP Boötis is a variable star with 2 brown dwarfs in the constellation Boötes. With an apparent magnitude of 6.0, it is faintly visible to
HD_130948
Northern pole-star; brightest star in Ursa Minor
in August 1779 by William Herschel, with the inner Aa/Ab pair only confirmed in the early 20th century. As the closest Cepheid variable, Polaris Aa's distance
Polaris
Star in the constellation Andromeda
shows a regular variability within a rotation period, typical of BY Draconis variable stars, but occasionally increases its brightness in a stellar flare
FF_Andromedae
Spectroscopic binary in constellation Capricornus
brightness by Edward W. Weis at the Van Vleck Observatory. It was given the variable-star designation BB Capricorni and classified as a BY Draconis variable in
Wolf_922
Star in the constellation Cygnus
blue end of the spectrum) (see also Apparent magnitude.) It is a BY Draconis variable changing brightness slightly, probably from star-spots, with a period
Kepler-186
Star in the constellation Taurus
International Variable Star Index. AAVSO. Retrieved 2022-06-29. Naftilan, S. A.; Fairchild, K. (1993). "Abundance Analysis of the BY Draconis Variable, Hot Flare
HD_283750
Triple star in the constellation Cetus
star with a classification of G3 V. It is a BY Draconis variable with a periodicity of 8.92 days and a variable-star designation of EZ Ceti. The tertiary
Chi_Ceti
Binary star system in the constellation Aquila
such stars in 1919. It is a variable star with the variable star catalog name V1428 Aquilae. It is a BY Draconis type variable star subject to flare events
Gliese_752
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