145 G. Canis Majoris

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145 G. Canis Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 07h 16m 36.83456s[1]
Declination −23° 18′ 56.1383″[1]
Apparent magnitude (V) 4.79[2]
Characteristics
Spectral type K3Ib-[3] or K4III[4]
B−V color index 1.710[2]
Distance
2,700 ± 200 ly
(820 ± 70 pc)
Details
If a giant star
Myr
HR 2764, SAO 173349, WDS J07166-2319A[9]
Database references
SIMBADdata

145 G. Canis Majoris (HD 56577) is a single

supergiant star in the southern constellation of Canis Major. This star is Gould's 145th of Canis Major in his Uranometria Argentina. [11] Kostjuk erroneously lists it as simply "145 CMa". SIMBAD follows this error in its object query result as "* 145 CMa – Star".[12]

The properties and evolutionary state of 145 G. CMa are disputed, it being classed either as a young massive supergiant or a somewhat older and less massive giant. It has been given two MK

spectral classifications: K3Ib[3] (corresponding to a supergiant) and K4III[4]
(corresponding to a giant). Tezzlaff et al. gives a large mass of 7.8 
K-type stars.[13]

Based on the assumption that it is a

Gaia DR2 parallax, it would have a luminosity of 14,000 L☉, rather high for a giant.[5] An older measurement based on the Hipparcos distance of 435 parsecs (1,420 ly) give a lower luminosity of 5,960 L☉.[14]

The star is one component of a close

″.[15] The two stars appear to be unrelated and the close alignment accidental, with HD 56578 being a much closer and less luminous Am star.[16]

Notes

  1. ^ a b Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    .

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    S2CID 118505114
    .
  3. ^
    doi:10.1086/191373
    .
  4. ^
    Bibcode:1988mcts.book.....H
    .
  5. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  6. ^
    S2CID 118629873
    .
  7. ^
    ISSN 0035-8711
    .
  8. doi:10.1051/0004-6361:20021214
    .
  9. ^ "HD 56577". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-06.
  10. S2CID 14878976
    .
  11. ^ Gould, B. A., (2009) Uranometria Argentina, (Reprinted and updated by Pilcher, F.)[1] Archived 2016-03-05 at the Wayback Machine
  12. ^ SIMBAD query * 145 CMa – Star
  13. ^ "The Colour of Stars". Australia National Telescope Facility. Retrieved 2024-05-27.
  14. ISSN 0035-8711. 145 CMa's database entry at VizieR
    .
  15. doi:10.1086/323920
    .
  16. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
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