| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 12h 39m 52.52839s[2] |
| Declination | −55° 58′ 31.8904″[2] |
| Apparent magnitude (V) | +4.63[1] |
| Characteristics | |
| Spectral type | B8II/III[3] |
| B−V color index | −0.082±0.013[1] |
| Astrometry | |
| Radial velocity (Rv) | +15.1±2.8[1] km/s |
| Proper motion (μ) | RA: −43.38[2] mas/yr Dec.: −25.25[2] mas/yr |
| Parallax (π) | 8.94±0.24 mas[2] |
| Distance | 365 ± 10 ly (112 ± 3 pc) |
| Absolute magnitude (MV) | −0.61[1] |
| Details | |
| HD 110073 A | |
| Mass | 4.0±0.2[4] M☉ |
| Radius | 3.7[5] R☉ |
| Luminosity | 385[4] L☉ |
| Surface gravity (log g) | 3.35[6] cgs |
| Temperature | 12,900[4] K |
| Metallicity [Fe/H] | −0.90[6] dex |
| Rotation | 3.03 days[7] |
| Rotational velocity (v sin i) | 46±10[8] km/s |
| Age | 129[4] Myr |
| HD 110073 B | |
| Mass | 1.13[4] M☉ |
| Luminosity | 1.2[4] L☉ |
| Temperature | 5,662[4] K |
| Other designations | |
| l Cen, CD−39°7748, HD 110073, HIP 61789, HR 4817, SAO 203681[9] | |
| 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.[1] 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.[1]
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.[10] 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.[11] 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
[edit]- ^ a b c d e f g 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. XHIP record for this object at VizieR.
- ^ 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 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.
- ^ Kochukhov, O.; Khalack, V.; Kobzar, O.; Neiner, C.; Paunzen, E.; Labadie-Bartz, J.; David-Uraz, A. (2021). "TESS survey of rotational and pulsational variability of mercury-manganese stars". Monthly Notices of the Royal Astronomical Society. 506 (4): 5328. arXiv:2107.09096. Bibcode:2021MNRAS.506.5328K. doi:10.1093/mnras/stab2107.
- ^ 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.
