HD 73389
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | 08h 35m 19.70886s[1] |
| Declination | −58° 00′ 33.2714″[1] |
| Apparent magnitude (V) | +4.84[2] (5.08 + 8.02)[3] |
| Characteristics | |
| Spectral type | K0III[4] |
| B−V color index | 0.981±0.041[2] |
| Astrometry | |
| Radial velocity (Rv) | +25.62±0.13[1] km/s |
| Proper motion (μ) | RA: +52.848±0.555[1] mas/yr Dec.: +28.117±0.491[1] mas/yr |
| Parallax (π) | 14.5139 ± 0.2692 mas[1] |
| Distance | 225 ± 4 ly (69 ± 1 pc) |
| Absolute magnitude (MV) | 0.68[2] |
| Details | |
| A | |
| Radius | 11.13+1.11 −0.39[1] R☉ |
| Luminosity | 64.4±1.4[1] L☉ |
| Temperature | 4,903+87 −229[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 73389 is a binary star[3] system in the constellation Carina. It has the Bayer designation e2 Carinae; HD 73389 is the identifier from the Henry Draper Catalogue. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of +4.84.[2] Based on parallax measurements, it is located at a distance of approximately 225 light years from the Sun. The system is drifting further away with a radial velocity of +25.6 km/s.[1]
The visual magnitude 5.08 primary, component A, is an aging K-type giant star with a stellar classification of K0III.[4] With the supply of hydrogen at its core exhausted, it has cooled and expanded to 11 times the Sun's radius.[1] It is radiating 64 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,903 K.[1] The secondary companion, component B, has a visual magnitude of 8.02 and is located at an angular separation of 0.30″ along a position angle of 207° from the primary, as of 2015.[6]
References
[edit]- ^ a b c d e f g h i j k l 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.
- ^ a b c d 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.
- ^ a b Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- ^ "HD 73389". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-11.
- ^ 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, retrieved 2015-07-22
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