HD 110073

HD 110073 is a star in the southern constellation Centaurus, near the southern constellation border with Crux. It has the Bayer designation l Centauri (lower case L), while HD 110073 is the star's identifier from the Henry Draper catalogue. This system is faintlyvisible to the naked eye with an apparent visual magnitude of +4.63.[2] It is located at a distance of approximately 365 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +15 km/s.[2]

This article is about l centauri. It is not to be confused with i Centauri or λ Centauri.
HD 110073
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension  12h 39m 52.52839s[1]
Declination −55° 58′ 31.8904″[1]
Apparent magnitude (V) +4.63[2]
Characteristics
Spectral type B8II/III[3]
B−V color index −0.082±0.013[2]
Astrometry
Radial velocity (Rv)+15.1±2.8[2] km/s
Proper motion (μ) RA: −43.38[1] mas/yr
Dec.: −25.25[1] mas/yr
Parallax (π)8.94 ± 0.24[1] mas
Distance365 ± 10 ly
(112 ± 3 pc)
Absolute magnitude (MV)−0.61[2]
Details
HD 110073 A
Mass4.0±0.2[4] M☉
Radius3.7[5] R☉
Luminosity385[4] L☉
Surface gravity (log g)3.35[6] cgs
Temperature12,900[4] K
Metallicity [Fe/H]−0.90[6] dex
Rotational velocity (v sin i)46±10[7] km/s
Age129[4] Myr
HD 110073 B
Mass1.13[4] M☉
Luminosity1.2[4] L☉
Temperature5,662[4] K
Other designations
l Cen, CD−39°7748, HD 110073, HIP 61789, HR 4817, SAO 203681[8]
Database references
SIMBADdata

This is a single-lined spectroscopic binary star system that belongs to the Pleiades stream.[4] As of 2011, the pair had a linear projected separation of 130.8±12.1 AU.[9] The primary component is a mercury-manganese star[6] with a stellar classification of B8II/III.[3] These stars are often helium-weak, but this is one of the most normal members of this group in terms of helium abundance.[10] The system is a source for X-ray emission, which is most likely coming from the lower mass companion – it may even be a pre-main-sequence star.[4]

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
  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.
  3. Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
  4. Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics, 372: 152–164, arXiv:astro-ph/0103201, Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452
  5. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  6. Adelman, S. J.; Philip, A. G. Davis (November 1990), "Elemental abundances of the mercury-manganese stars HR 4817 and KHI Lupi", Astronomy and Astrophysics, 238: 111, Bibcode:1990A&A...238..111A.
  7. Buscombe, W.; Stoeckley, T. R. (October 1975), "Absorption Line Profiles and Rotational Velocities for 59 Stars", Astrophysics and Space Science, 37 (1): 197–220, Bibcode:1975Ap&SS..37..197B, doi:10.1007/BF00646073.
  8. "HD 110073". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-30.
  9. Schöller, M.; et al. (November 2010), "Multiplicity of late-type B stars with HgMn peculiarity", Astronomy and Astrophysics, 522: 12, arXiv:1010.3643, Bibcode:2010A&A...522A..85S, doi:10.1051/0004-6361/201014246, A85.
  10. Adelman, S. J.; Pintado, O. I. (October 1997), "Elemental abundance analyses with Complejo Astronomico EL Leoncito REOSC echelle spectrograms", Astronomy and Astrophysics Supplement Series, 125: 219–227, Bibcode:1997A&AS..125..219A, doi:10.1051/aas:1997375.
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