EL Canum Venaticorum

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Double star
EL Canum Venaticorum
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Hunting dogs
Right ascension 13 h 23 m 57.02 s
declination + 43 ° 35 ′ 55.4 ″
Apparent brightness 9.42 (9.42 to 9.59) mag
Typing
B − V color index (0.16) 
Spectral class A3 V
Variable star type EA / EL 
Astrometry
Radial velocity (-58.6 ± 0.3) km / s
parallax (3.75 ± 0.04)  mas
distance (869 ± 9)  ly
(267)  pc
Proper movement 
Rec. Share: (19.46 ± 0.04)  mas / a
Dec. portion: (-18.76 ± 0.05)  mas / a
Physical Properties
Dimensions (1.75 / 0.19)  M ☉
Other names
and catalog entries
Bonn survey BD +44 2271
Henry Draper Catalog HD 116608 [1]
Hipparcos catalog HIP 65380 [2]
SAO catalog SAO 44595 [3]
Tycho catalog TYC 3031-620-1 [4]
2MASS catalog 2MASS J13235701 + 4335553 [5]
Other names EL Canum Venaticorum, WASP 1323 + 43

EL Canum Venaticorum is a binary star system consisting of a relatively massive main sequence star of the spectral class A1 and a post-AGB star at a distance of about 850  light years . It is the prototype of the so-called EL Canum Venaticorum stars , which belong to the eclipsed stars .

There is a presumption that the smaller companion was originally the massive star and that the two stars switched roles through mass transfer . According to today's knowledge, this theory best explains why the companion is already in this late stage of development despite its low mass .

Individual evidence

  1. ↑ a b c d e f EL CVn. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 16, 2018 .
  2. ↑ a b c EL CVn. In: VSX. AAVSO, accessed September 16, 2018 .
  3. ↑ PFL Maxted t al .: EL CVn-type binaries - Discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems . In: MNRAS . tape 437 , no. 2 , 2014, p. 1681–1697 , doi : 10.1093 / mnras / stt2007 , arxiv : 1310.4863 , bibcode : 2014MNRAS.437.1681M .