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HD 110073
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Centaurus
Right ascension	12h 39m 52.52839s
Declination	−55° 58′ 31.8904″
Apparent magnitude (V)	+4.63
Characteristics
Spectral type	B8II/III
B−V color index	−0.082±0.013
Astrometry
Radial velocity (Rv)	+15.1±2.8 km/s
Proper motion (μ)	RA: −43.38 mas/yr ; Dec.: −25.25 mas/yr
Parallax (π)	8.94 ± 0.24 mas
Distance	365 ± 10 ly ; (112 ± 3 pc)
Absolute magnitude (MV)	−0.61
Details
HD 110073 A
Mass	4.0±0.2 M☉
Radius	3.7 R☉
Luminosity	385 L☉
Surface gravity (log g)	3.35 cgs
Temperature	12,900 K
Metallicity [Fe/H]	−0.90 dex
Rotational velocity (v sin i)	46±10 km/s
Age	129 Myr
HD 110073 B
Mass	1.13 M☉
Luminosity	1.2 L☉
Temperature	5,662 K
Other designations
	l Cen, CD−39°7748, HD 110073, HIP 61789, HR 4817, SAO 203681
Database references
SIMBAD	data

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 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

^ ^a ^b ^c ^d ^e 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, S2CID 18759600
^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ 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, S2CID 17507782
^ 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, S2CID 425754.
^ ^a ^b ^c 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.
^ 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, S2CID 122985118.
^ "HD 110073". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-30.
^ 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, S2CID 119273467, A85.
^ 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 (2): 219–227, Bibcode:1997A&AS..125..219A, doi:10.1051/aas:1997375.