Astronomy:Omega Lupi
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 38m 03.20372s[1] |
| Declination | −42° 34′ 02.4444″[1] |
| Apparent magnitude (V) | 4.33[2] (4.33 + 11.0)[3] |
| Characteristics | |
| Spectral type | K4.5 III[4] |
| U−B color index | +1.72[2] |
| B−V color index | +1.43[2] |
| Astrometry | |
| Radial velocity (Rv) | −6.8±2.7[5] km/s |
| Proper motion (μ) | RA: −21.37[1] mas/yr Dec.: −29.98[1] mas/yr |
| Parallax (π) | 8.97 ± 0.27[1] mas |
| Distance | 360 ± 10 ly (111 ± 3 pc) |
| Absolute magnitude (MV) | +0.21[6] |
| Details | |
| A | |
| Radius | 22[7] R☉ |
| Luminosity | 122[7] L☉ |
| Temperature | 4,087[7] K |
| B | |
| Radius | 0.8[8] R☉ |
| Luminosity | 0.21[8] L☉ |
| Surface gravity (log g) | 4.56[8] cgs |
| Temperature | 4,480[8] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omega Lupi, Latinised from ω Lupi, is a double star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 4.33,[2] showing up as a red-hued star just to the south of Gamma Lupi.[10] Based upon an annual parallax shift of 8.97[1] mas as seen from Earth, it is located around 360 light-years from the Sun.
As of 2007, the components of this system had an angular separation of 11.4 arcseconds along a position angle of 29°,[11] and are most likely gravitationally bound as a wide binary star system.[3] The primary component is a magnitude 4.48 evolved giant star with a stellar classification of K4.5 III.[4] The measured angular diameter, after correction for limb darkening, is 3.39±0.04 mas.[12] At the estimated distance of Omega Lupi, this yields a physical size of about 40 times the radius of the Sun.[13] The companion is a magnitude 11.0 star.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 3.2 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 4.0 4.1 Landi Dessy, J.; Keenan, P. C. (November 1966), "Spectral Types on the MK System for Forty-Three Bright Southern Stars, K2-M6", Astrophysical Journal 146: 587, doi:10.1086/148925, Bibcode: 1966ApJ...146..587L.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 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. Gaia DR2 record for this source at VizieR.
- ↑ 8.0 8.1 8.2 8.3 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. Gaia DR2 record for this source at VizieR.
- ↑ "ome Lup". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ome+Lup.
- ↑ Arnold, H.J.P et al. (1999), The Photographic Atlas of the Stars, CRC Press, p. 176, ISBN 0750306548, https://books.google.com/books?id=YjcvJUfnWBAC&pg=PA176.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
- ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R.
- ↑ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:
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