Astronomy:HD 69863

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Short description: Binary star system in the constellation Carina
HD 69863
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000.0      [[Astronomy:Equinox (celestial coordinates)|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[1] mas
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[3] mas
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: {{{names2}}}
B: {{{names3}}}
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. Jump up to: 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. Jump up to: 2.0 2.1 2.2 2.3 2.4 Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode2001AJ....122.3466M. 
  3. Jump up to: 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  4. Jump up to: 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode1978mcts.book.....H 
  5. Jump up to: 5.0 5.1 Corbally, C. J. (1984), "Close visual binaries. I. MK classifications", Astrophysical Journal Supplement Series 55: 657, doi:10.1086/190973, Bibcode1984ApJS...55..657C. 
  6. Jump up to: 6.0 6.1 6.2 6.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A. 
  7. Jump up to: 7.0 7.1 7.2 7.3 7.4 Gullikson, Kevin et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal 152 (2): 40, doi:10.3847/0004-6256/152/2/40, Bibcode2016AJ....152...40G. 
  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, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode2012MNRAS.427..343M. 
  9. Jump up to: 9.0 9.1 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, doi:10.1051/0004-6361:20020943, Bibcode2002A&A...393..897R 
  10. "HD 69863". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+69863.  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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode2008MNRAS.389..869E. 
  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, Bibcode2017JDSO...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, doi:10.1051/0004-6361:20077429, Bibcode2007A&A...475..677S.