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{{Short description|Binary star system in the constellation Carina}}
{{about|e<sup>2</sup> Carinae|e<sup>1</sup> Carinae|HD 73390|E Carinae|V345 Carinae}}
{{about|e<sup>2</sup> Carinae|e<sup>1</sup> Carinae|HD 73390|E Carinae|V345 Carinae}}
{{distinguish|ε Carinae}}
{{distinguish|ε Carinae}}
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| journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012
| journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | postscript=. }}</ref>
| doi=10.1134/S1063773712050015 | s2cid=119257644 | postscript=. }}</ref>


<ref name=houk1978>{{citation
<ref name=houk1978>{{citation
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| journal=Monthly Notices of the Royal Astronomical Society
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869 | date=2008
| volume=389 | issue=2 | pages=869 | date=2008
| doi=10.1111/j.1365-2966.2008.13596.x | arxiv=0806.2878
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878
| bibcode=2008MNRAS.389..869E | postscript=. }}</ref>
| bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}</ref>


<ref name=Mason2014>{{citation
<ref name=Mason2014>{{citation
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| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| title=The Washington Visual Double Star Catalog
| title=The Washington Visual Double Star Catalog
| year=2014 | bibcode=2001AJ....122.3466M | doi=10.1086/323920
| journal=The Astronomical Journal | year=2014 | volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | doi=10.1086/323920
| url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds
| url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds
| access-date=2015-07-22 | doi-access=free }}</ref>
| access-date=2015-07-22 | doi-access=free }}</ref>
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{{Stars of Carina}}
{{Stars of Carina}}


{{DEFAULTSORT:HD 73389}}
[[Category:K-type giants]]
[[Category:K-type giants]]
[[Category:Binary stars]]
[[Category:Binary stars]]
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[[Category:Henry Draper Catalogue objects|073389]]
[[Category:Henry Draper Catalogue objects|073389]]
[[Category:Hipparcos objects|042134]]
[[Category:Hipparcos objects|042134]]
[[Category:HR objects|3414]]
[[Category:Bright Star Catalogue objects|3414]]

Latest revision as of 19:54, 18 July 2024

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

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]
  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.
  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", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
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