27 Canis Majoris

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27 Canis Majoris

Blue band light curves for EW Canis Majoris. The main plot shows the long term variability, and the inset plot shows the short term variability. Adapted from Mennickent et al. (1994) and Balona & Rozowsky (1991).[1][2]
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 07h 14m 15.21192s[3]
Declination −26° 21′ 09.0312″[3]
Apparent magnitude (V) +4.65[4] (+4.92 + 5.39)[5]
Characteristics
Spectral type B3 IIIpe[6]
B−V color index −0.17±0.16[7]
Variable type γ Cas + β Cep:[8]
Distance
approx. 1,700 ly
(approx. 530 pc)
Absolute magnitude (MV)−4.13[7]
Argument of periastron
(ω)
(secondary)		85.0±3.6°
Details
27 CMa A
Myr
HR 2745, SAO 173264, CCDM J07143-2621, WDS J07143-2621[12]
Database references
SIMBADdata

27 Canis Majoris is a

apparent visual magnitude of +4.65.[4] It is moving away from the Earth with a heliocentric radial velocity of 16 km/s.[7]

The pair of stars in this system were first resolved by

projected rotational velocity of 290 km/s, compared to a critical velocity of 389 km/s.[11] The star appears to be a Beta Cephei variable[14] with a pulsation period of 0.0919 days and an amplitude of 0.0080 in magnitude.[15]

The magnitude 5.39[5] secondary, component B, is classified as a Gamma Cassiopeiae type variable star. Due to its variable nature, the brightness of the system varies from magnitude +4.42 to +4.82.[8]

References

  1. Bibcode:1994A&AS..108..237M
    .
  2. doi:10.1093/mnras/251.1.66P
    .
  3. ^
    S2CID 18759600
    .
  4. ^
    S2CID 111387483
    .
  5. ^
    S2CID 14878976
    .
  6. ^
    Bibcode:1955MmMtS..12..125W
    .
  7. ^
    S2CID 119257644
    .
  8. ^
    S2CID 125853869
    .
  9. ^ a b Hartkopf, W. I.; et al. (June 30, 2006), Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, archived from the original on 2017-04-30, retrieved 2017-06-02.
  10. ^
    S2CID 118629873
    .
  11. ^
    S2CID 19016751
    .
  12. ^ a b "27 CMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 1, 2019.
  13. doi:10.1086/118630
    .
  14. Bibcode:1994IBVS.4022....1B
    .
  15. S2CID 119526948
    .
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