21 CVn, BK Canum Venaticorum, BD+50° 1994, FK5 3063, HD 115735, HIP 64906, HR 5023, SAO 44556[8]
Database references
SIMBAD
data
21 Canum Venaticorum is a single[9] variable star[5] in the northern constellation of Canes Venatici, located 277 light years away from the Sun.[1] This object has the variable star designation BK Canum Venaticorum; 21 Canum Venaticorum is the Flamsteed designation. It is visible to the naked eye as a faint white-hued star with a baseline apparent visual magnitude of +5.14.[2]
According to Garrison et al. (1994)[3] this is a B-type subgiant star with a stellar classification of B9 IV (Si), where the suffix notation indicates this is a Silicon star. Cowley et al. (1969) listed it with a class of A0 V Si:,[4] which would match an A-type main-sequence star with the ':' indicating some uncertainty in the classification. It is a marginally chemically-peculiar star[10] with weaker than normal helium absorption lines and displaying helium line variability.[11] The widths of the lines of ionized silicon vary with a period of 21.12 ± 0.48 hours.[12]
21 Canum Venaticorum is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies by 0.04 magnitudes over a period of 18.4 hours.[5] It is around 201 million years old and is spinning with a relatively high projected rotational velocity of 96 km/s.[7] The star has 2.73[7] times the mass of the Sun and 2.8[6] times the Sun's radius. It is radiating 72[2] times the luminosity of the Sun from its photosphere at an effective temperature of 11,036 K.[7]
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and 29 Related for: 21 Canum Venaticorum information
21CanumVenaticorum is a single variable star in the northern constellation of Canes Venatici, located 277 light years away from the Sun. This object...
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RS CanumVenaticorum is a binary star system in the northern constellation of Canes Venatici. It serves as the prototype to the class of RS Canum Venaticorum...
20 CanumVenaticorum is a single variable star in the northern constellation of Canes Venatici, located 238 light years from the Sun. This object has...
La Superba (Y CVn, Y CanumVenaticorum) is a strikingly red giant star in the constellation Canes Venatici. It is a carbon star and semiregular variable...
AW CanumVenaticorum is a variable star in the constellation Canes Venatici. It is visible to the naked eye with a nominal apparent visual magnitude of...
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to 25 CanumVenaticorum (CVn); however, 1 CVn turned out to be in Ursa Major, 13 CVn was in Coma Berenices, and 22 CVn did not exist. Alpha Canum Venaticorum...
HR 5110, also known as BH CanumVenaticorum, is a binary star system in the northern constellation of Canes Venatici. It is visible to the naked eye with...
6 CanumVenaticorum is a single star in the northern constellation Canes Venatici, located 246 light years from the Sun. It is visible to the naked eye...
10 CanumVenaticorum is the Flamsteed designation for an ordinary star in the northern constellation of Canes Venatici. It has an apparent visual magnitude...
19 CanumVenaticorum is a binary star system in the northern constellation of Canes Venatici, located approximately 238 light years from Sun based on...
magnitude derived from adding the magnitudes of Alpha2 CanumVenaticorum (2.88) and Alpha1 CanumVenaticorum (5.60) as per the formula: 2.79 ≈ − 2.5 log 10 ...
966 days. It is a detached Algol-type eclipsing binary of the RS CanumVenaticorum class with a subgiant component. (This means the pair have a close...
"p" stands for peculiar, as its spectrum is characteristic of an α2 CanumVenaticorum variable. Epsilon Ursae Majoris, as a representative of this type...
publications by Rieke included "A study of the spectrum of alpha2 CanumVenaticorum" (Astrophysical Journal 1929), "Wave-Length Standards in the Extreme...
1, 1785. It is positioned 1+1⁄4° to the southeast of the star 25 CanumVenaticorum. The morphological classification of this galaxy is SA0(s), indicating...
H-alpha emission lines. In 1979, this object was shown to be an RS CanumVenaticorum variable (RS CVn) by D. Crampton and associates, which indicated this...
the lines of helium are weaker than expected. The star is an Alpha2 CanumVenaticorum-type variable, ranging in magnitude from 5.35 down to 5.43 with a...
appears to have an active chromosphere and is classified as an RS CanumVenaticorum variable with a variable star designation of BU Cet. The star was...
separation about 4,000 AU. ξ Ursae Majoris is classified as an RS CanumVenaticorum variable and its brightness varies by 0.01 magnitude. Component B...
the secondary has been detected using interferometry. It is an RS CanumVenaticorum variable system with eclipses. The total amplitude of variation is...
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supergiant with an apparent magnitude of 6.05. This star is an Alpha-2 CanumVenaticorum variable, showing small changes in brightness as it rotates. There...
GU Piscium is a star in the constellation Pisces. An RS CanumVenaticorum variable, it ranges from magnitude 12.96 to 13.24 over 1.04 days. It is 48 Parsecs...
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iron-peak element chromium, as well as strontium. This is an Alpha2 CanumVenaticorum (ACV) variable, which indicates it varies in luminosity as it rotates...
exist in the cluster. The luminosity of the sources was typical of RS CanumVenaticorum variables, close binaries that could retain very active coronal sources...
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