| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| A | |
| Right ascension | 08 15 16.42864 |
| Declination | −62° 54′ 56.5007″ |
| Apparent magnitude (V) | 5.27 |
| B | |
| Right ascension | 08 15 16.47622 |
| Declination | −62° 54′ 54.8700″ |
| Apparent magnitude (V) | 7.62 |
| Characteristics | |
| Spectral type | A2V + F2V |
| B−V color index | 0.086±0.003 |
| Astrometry | |
| Radial velocity (Rv) | 4.0±3.7 km/s |
| Absolute magnitude (MV) | 0.71 |
| A | |
| Proper motion (μ) | RA: −26.674 mas/yr Dec.: -12.060 mas/yr |
| Parallax (π) | 12.5410 ± 0.1714 mas |
| Distance | 260 ± 4 ly (80 ± 1 pc) |
| B | |
| Proper motion (μ) | RA: −20.911 mas/yr Dec.: -14.466 mas/yr |
| Parallax (π) | 12.7714 ± 0.0329 mas |
| Distance | 255.4 ± 0.7 ly (78.3 ± 0.2 pc) |
| Details | |
| A | |
| Mass | 2.10+0.20 −0.17 M☉ |
| Luminosity | 42 L☉ |
| Surface gravity (log g) | 3.90±0.14 cgs |
| Temperature | 8774+601 −210 K |
| Rotational velocity (v sin i) | 191 km/s |
| B | |
| Radius | 1.43+0.12 −0.08 R☉ |
| Luminosity | 3.966±0.016 L☉ |
| Temperature | 6806+203 −258 K |
| Age | 635±88 Myr |
| Other designations | |
| RMK8, C Carinae, CPD−62°985, HD 69863, HIP 40429, HR 3260, CCDM J08153-6255 | |
| A: GC 11275, SAO 250164 | |
| B: GC 11276, SAO 250165 | |
| Database references | |
| SIMBAD | data |
HD 69863 is a binary star 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. The system is located at a distance of about255 light years from the Sun based on parallax. The dual nature of this system was announced in 1832 by German astronomer Carl Rümker. As of 2015, the pair had an angular separation of 4.10″ along a position angle of 70°.
The brighter primary, designated component A, has a visual magnitude of 5.27 and is an A-type main-sequence star with a stellar classification of A2V. It is 635 million years old and is spinning with a projected rotational velocity of 191 km/s. The star has 2.1 times the mass of the Sun.
The magnitude 7.62 companion, component B, is a F-type main-sequence star with a class of F2V. It is radiating four times the luminosity of the Sun from its photosphere at an effective temperature of 6,806 K. The system is a source for X-ray emission, which is most likely coming from the secondary.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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
- ^ Corbally, C. J. (1984), "Close visual binaries. I. MK classifications", Astrophysical Journal Supplement Series, 55: 657, Bibcode:1984ApJS...55..657C, doi:10.1086/190973.
- ^ 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.
- ^ 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.
- 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.
- ^ 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
- "HD 69863". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-07. Component B.
- 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.
- 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.
- 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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