Categories
  • Durchmusterung objects
  • Henry Draper Catalogue objects
  • Hipparcos objects
    •   Encyclosphere.org ENCYCLOREADER
      supported by EncyclosphereKSF

    HD 29587

    Topic: Astronomy

     From Handwiki - Reading time: 3 min
    Short description: Star in the constellation Perseus
    HD 29587
    Observation data
    Equinox J2000.0]] (ICRS)
    Constellation Perseus
    Right ascension  04h 41m 36.31645s[1]
    Declination +42° 07′ 06.4209″[1]
    Apparent magnitude (V) 7.29[2]
    Characteristics
    Spectral type G2 V[3]
    B−V color index 0.633[3]
    Astrometry
    Radial velocity (Rv)+112.67±0.20[1] km/s
    Proper motion (μ) RA: +534.004[1] mas/yr
    Dec.: −414.768[1] mas/yr
    Parallax (π)36.3130 ± 0.0697[1] mas
    Distance89.8 ± 0.2 ly
    (27.54 ± 0.05 pc)
    Absolute magnitude (MV)5.08[3]
    Orbit[4]
    Period (P)1,474.9±10.2 d
    Eccentricity (e)0.713±0.006[5]
    Periastron epoch (T)JD 2,447,763.5±45.8
    Argument of periastron (ω)
    (secondary)    		80.2±13.3°
    Semi-amplitude (K1)
    (primary)    		1.02±0.16 km/s
    Details[3]
    Mass1.033±0.010[5] M☉
    Luminosity0.798+0.040−0.038 L☉
    Surface gravity (log g)4.54±0.22 cgs
    Temperature5,709±35 K
    Metallicity [Fe/H]−0.51±0.05 dex
    Age14.7+3.8
    −2.7     Gyr
    Other designations
    BD+41° 931, FK5 4419, HD 29587, HIP 21832, SAO 39690, TYC 2901-00064-1, 2MASS J04413631+4207065[6]
    Database references
    SIMBADdata
    Exoplanet Archivedata
    Extrasolar Planets
    Encyclopaedia    		data

    HD 29587 is a Sun-like[7] star with a candidate brown dwarf companion[8] in the northern constellation of Perseus. It has an apparent visual magnitude of 7.29,[2] which means it is too faint to be viewed with the naked eye. Based upon an annual parallax shift of 36.3 mas,[1] it is located 89.8 light years away. The star is moving away from the Earth with a heliocentric radial velocity of +113 km/s,[1] having come to within 55.8 ly some 148,000 years ago.[2] It is a hyper-velocity halo[7] star moving at a rate of 170 km/s relative to the local standard of rest.[9]

    This ancient star has a stellar classification of G2 V,[3] matching a G-type main-sequence star. It has 78% of the mass of the Sun and is radiating 80% of the Sun's luminosity from its photosphere at an effective temperature of 5,709 K.[3]

    Planetary system

    Formerly an IAU radial velocity standard, this star was found to have a variable radial velocity due to a suspected orbiting companion.[8] The a sin i value for the unseen object is 0.0957 ± 0.0108 astronomical unit|AU (14.31 ± 1.62 Gm),[4] where a is the semimajor axis and i is the orbital inclination – providing a lower bound for the semimajor axis. The secondary object most likely has a mass in the range 41.0–97.8 Jupiter mass, making it a probable brown dwarf.[10]

    The HD 29587 planetary system[10]
    Companion
    (in order from star)     		Mass Semimajor axis
    (AU)     		Orbital period
    (days)     		Eccentricity Inclination Radius
    b ≥ 55.2±9.2[5] MJ ≥0.0957±0.0108 1,474.9±10.2 0.356±0.095 — —

    References

    1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
    2. ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
    3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Da Silva, Ronaldo et al. (2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy & Astrophysics 580: A24. doi:10.1051/0004-6361/201525770. Bibcode: 2015A&A...580A..24D. 
    4. ↑ 4.0 4.1 Halbwachs, J. L. et al. (March 2000). "Exploring the brown dwarf desert with Hipparcos". Astronomy and Astrophysics 355: 581–594. Bibcode: 2000A&A...355..581H. 
    5. ↑ 5.0 5.1 5.2 Kiefer, F. et al. (2019), "Detection and characterisation of 54 massive companions with the SOPHIE spectrograph", Astronomy & Astrophysics 631: A125, doi:10.1051/0004-6361/201935113 
    6. ↑ "HD 29587". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+29587. 
    7. ↑ 7.0 7.1 Fossati, L. et al. (2017). "The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies". Astronomy & Astrophysics 601: 17. doi:10.1051/0004-6361/201630339. A104. Bibcode: 2017A&A...601A.104F. 
    8. ↑ 8.0 8.1 Mazeh; Latham, David W.; Stefanik, Robert P. (1996). "Spectroscopic Orbits for Three Binaries with Low-Mass Companions and the Distribution of Secondary Masses near the Substellar Limit". Astrophysical Journal 466: 415–427. doi:10.1086/177521. Bibcode: 1996ApJ...466..415M. 
    9. ↑ Hobbs, L. M.; Duncan, Douglas K. (June 15, 1987). "The lithium abundance in halo stars". Astrophysical Journal, Part 1 317: 796–809. doi:10.1086/165328. Bibcode: 1987ApJ...317..796H. 
    10. ↑ 10.0 10.1 Reffert, S.; Quirrenbach, A. (March 2011). "Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs". Astronomy & Astrophysics 527: 22. doi:10.1051/0004-6361/201015861. A140. Bibcode: 2011A&A...527A.140R. 



    Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:HD_29587&oldid=3345827"
    This article is licensed under CC BY-SA 3.0.
    Original source: https://handwiki.org/wiki/HD 29587
    Status: article is cached
    Encyclosphere.org EncycloReader is supported by the EncyclosphereKSF