Xi1 Canis Majoris

Xi1 Canis Majoris
Diagram showing star positions and boundaries of the Canis Major constellation and its surroundings
Location of ξ1 Canis Majoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 06h 31m 51.36636s[1]
Declination −23° 25′ 06.3181″[1]
Apparent magnitude (V) +4.33[2]
Characteristics
Spectral type B1 III[3]
U−B color index −0.98[2]
B−V color index −0.24[2]
Variable type β Cep[3]
Astrometry
Radial velocity (Rv)−26.9[4] km/s
Proper motion (μ) RA: −2.91[1] mas/yr
Dec.: +6.22[1] mas/yr
Parallax (π)2.36 ± 0.20[1] mas
Distance1,400 ± 100 ly
(420 ± 40 pc)
Absolute magnitude (MV)−3.78[5]
Details
Mass13.7±0.9[3] M☉
Radius7.1±0.9[3] R☉
Luminosity25,000[3] L☉
Surface gravity (log g)3.83±0.20[3] cgs
Temperature27100±1200[3] K
Metallicity [Fe/H]−0.18[5] dex
Rotational velocity (v sin i)20±7[3] km/s
Other designations
ξ1 CMa, 4 CMa, CD−23° 3991, GC 8496, HD 46328, HIP 31125, HR 2387, SAO 171895, ADS 5176, CCDM 06319-2325
Database references
SIMBADdata

Xi1 Canis Majoris, Latinized from ξ1 Canis Majoris, is a star in the constellation Canis Major. It is approximately 1,400 light years from Earth.

ξ1 Canis Majoris is a blue-white B-type subgiant with a mean apparent magnitude of +4.34. It is classified as a Beta Cephei type variable star[3] and its brightness varies from magnitude +4.33 to +4.36 with a period of 5.03 hours.

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. 1 2 3 4 5 6 7 8 9 Hubrig, S.; et al. (January 2009), "New magnetic field measurements of beta Cephei stars and Slowly Pulsating B stars", Astronomische Nachrichten, 330 (4): 317, arXiv:0902.1314, Bibcode:2009AN....330..317H, doi:10.1002/asna.200811187
  4. ↑ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E.
  5. 1 2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.


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