HD 73389

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]

This article is about e2 Carinae. For e1 Carinae, see HD 73390. For E Carinae, see V345 Carinae.
Not to be confused with ε Carinae.
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]
Distance225 ± 4 ly
(69 ± 1 pc)
Absolute magnitude (MV)0.68[2]
Details
A
Radius11.13+1.11
−0.39[1] R☉
Luminosity64.4±1.4[1] L☉
Temperature4,903+87
−229[1] K
Other designations
e2 Car, CPD−57°1591, GC 11797, HD 73389, HIP 42134, HR 3414, SAO 236106, CCDM J08353-5801[5]
Database references
SIMBADdata

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
  1. 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. 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.
  3. 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.
  4. 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.
  5. "HD 73389". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-11.
  6. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
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