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    HR 4177

    From Wikipedia - Reading time: 6 min
    This article is about t2 Carinae. For t1 Carinae, see HD 92063.
    HR 4177
    Observation data
    Epoch J2000      Equinox J2000
    Constellation Carina
    Right ascension 10h 38m 44.99524s[1]
    Declination −59° 10′ 58.7927″[1]
    Apparent magnitude (V) 4.77 (4.85 + 7.67)[2]
    Characteristics
    A
    Spectral type K4.5Ib-II[3]
    B−V color index 1.562±0.015[3]
    B
    Spectral type B9II/III[3]
    B−V color index 0.100±0.020[3]
    Astrometry
    A
    Radial velocity (Rv)+11.0±0.8[3] km/s
    Proper motion (μ) RA: −14.284±0.338[1] mas/yr
    Dec.: +1.117±0.329[1] mas/yr
    Parallax (π)2.0056±0.1809 mas[1]
    Distance1,600 ± 100 ly
    (500 ± 40 pc)
    Absolute magnitude (MV)−3.66[3]
    B
    Proper motion (μ) RA: −14.380±0.089[1] mas/yr
    Dec.: +0.932±0.085[1] mas/yr
    Parallax (π)2.1854 ± 0.0512 mas[1]
    Distance1,490 ± 30 ly
    (460 ± 10 pc)
    Details
    A
    Mass11.9±0.2[4] M☉
    Radius202+5
    −6    [1] R☉
    Luminosity8,478±875[1] L☉
    Temperature3,900+63
    −48    [1] K
    Age16.4±1.0[4] Myr
    B
    Temperature8,316+1,256
    −1,389    [1] K
    Other designations
    t2 Car, CPD−58°2460, HR 4177, CCDM J10388-5911, WDS J10387-5911[5]
    A: GC 14647, HD 92397, HIP 52102, SAO 238295[5]
    B: GC 14649, HD 92398, HIP 52106, SAO 238297[6]
    Database references
    SIMBADA
    B

    HR 4177, also called t2 Carinae (t2 Car), is a double star[2] in the southern constellation of Carina. It is faintly visible to the naked eye with a combined apparent visual magnitude of +4.77.[2] The two components are HD 92397 and HD 92398. The primary component is located at a distance of approximately 1,600 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +11 km/s.[3] It has a peculiar velocity of 24.3+9.9
    −16.1     km/s     and may be a runaway star.[4] The star is a member of the BH 99 cluster.[7]

    The magnitude 4.85[2] primary, component A, is a massive K-type supergiant or bright giant with a stellar classification of K4.5Ib-II.[3] Houk (1978) instead listed it with a class of K4/5III: but with some uncertainty about the classification.[8] It has 12[4] times the mass of the Sun and has expanded to 202[1] times the Sun's radius. The star is radiating 8,478[1] times the luminosity of the Sun from its bloated photosphere at an effective temperature of 3,900 K.[1]

    The magnitude 7.48 companion star, component B, was discovered by J. Dunlop in 1829. As of 2015, it was located at an angular separation of 14.60″ along a position angle of 21°, relative to the primary.[9] It is a B-type giant/bright giant star with a class of B9II/III.[3] The pair show a common proper motion and roughly similar parallax measurements,[1] but it remains unclear whether they form a gravitationally-bound pair.[2]

    References

    [edit]
    1. ^ a b c d e f g h i j k l m n o p 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.
    2. ^ a b c d e 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.
    3. ^ a b c d e f g h i 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.
    4. ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
    5. ^ a b "HD 92397". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-13.
    6. ^ "HD 92398". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-13.
    7. ^ Cantat-Gaudin, T.; et al. (October 2018), "A Gaia DR2 view of the open cluster population in the Milky Way", Astronomy & Astrophysics, 618: 16, arXiv:1805.08726, Bibcode:2018A&A...618A..93C, doi:10.1051/0004-6361/201833476, S2CID 56245426, A93.
    8. ^ 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.
    9. ^ 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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    Original source: https://en.wikipedia.org/wiki/HR 4177
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