HD 69863
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
A
Right ascension 08h 15m 16.42864s[1]
Declination −62° 54′ 56.5007″[1]
Apparent magnitude (V) 5.27[2]
B
Right ascension 08h 15m 16.47622s[3]
Declination −62° 54′ 54.8700″[3]
Apparent magnitude (V) 7.62[2]
Characteristics
Spectral type A2V[4] + F2V[5]
B−V color index 0.086±0.003[6]
Astrometry
Radial velocity (Rv)4.0±3.7[6] km/s
Absolute magnitude (MV)0.71[6]
A
Proper motion (μ) RA: −26.674[1] mas/yr
Dec.: -12.060[1] mas/yr
Parallax (π)12.5410 ± 0.1714 mas[1]
Distance260 ± 4 ly
(80 ± 1 pc)
B
Proper motion (μ) RA: −20.911[3] mas/yr
Dec.: -14.466[3] mas/yr
Parallax (π)12.7714 ± 0.0329 mas[3]
Distance255.4 ± 0.7 ly
(78.3 ± 0.2 pc)
Details
A
Mass2.10+0.20
−0.17[7] M☉
Luminosity42[8] L☉
Surface gravity (log g)3.90±0.14[7] cgs
Temperature8774+601
−210[1] K
Rotational velocity (v sin i)191[9] km/s
B
Radius1.43+0.12
−0.08[3] R☉
Luminosity3.966±0.016[3] L☉
Temperature6806+203
−258[3] K
Age635±88[7] Myr
Other designations
RMK8, C Carinae, CPD−62°985, HD 69863, HIP 40429, HR 3260, CCDM J08153-6255[10]
A: GC 11275, SAO 250164
B: GC 11276, SAO 250165
Database references
SIMBADdata

HD 69863 is a binary star[11] system in the southern constellation of Carina. It is visible to the naked eye as a dim point of light with a combined apparent visual magnitude of 5.16.[6] The system is located at a distance of about255 light years from the Sun based on parallax.[1][3] The dual nature of this system was announced in 1832 by German astronomer Carl Rümker.[12] As of 2015, the pair had an angular separation of 4.10″ along a position angle of 70°.[2]

The brighter primary, designated component A, has a visual magnitude of 5.27[2] and is an A-type main-sequence star with a stellar classification of A2V.[4] It is 635[7] million years old and is spinning with a projected rotational velocity of 191 km/s.[9] The star has 2.1 times the mass of the Sun.[7]

The magnitude 7.62[2] companion, component B, is a F-type main-sequence star with a class of F2V.[5] It is radiating four[3] times the luminosity of the Sun from its photosphere at an effective temperature of 6,806 K.[3] The system is a source for X-ray emission, which is most likely coming from the secondary.[13]

References

  1. 1 2 3 4 5 6 7 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 5 Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  3. 1 2 3 4 5 6 7 8 9 10 11 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. 1 2 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
  5. 1 2 Corbally, C. J. (1984), "Close visual binaries. I. MK classifications", Astrophysical Journal Supplement Series, 55: 657, Bibcode:1984ApJS...55..657C, doi:10.1086/190973.
  6. 1 2 3 4 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, S2CID 119257644.
  7. 1 2 3 4 5 Gullikson, Kevin; et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
  8. ↑ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  9. 1 2 Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763
  10. ↑ "HD 69863". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-07. Component B.
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  12. ↑ Letchford, Roderick; et al. (April 2017), "The Southern Double Stars of Carl Rümker I: History, Identification, Accuracy", Journal of Double Star Observations, 13 (2): 220–232, Bibcode:2017JDSO...13..220L.
  13. ↑ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677−684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
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