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Gamma Lupi, Latinized from γ Lupi, is a 3rd-magnitude, B-type blue giant star in the constellation of Lupus. It is also known in ancient Chinese astronomy as 騎官一 or "the 1st (star) of the Cavalry Officer". With a telescope, Gamma Lupi can be resolved into a binary star system in close orbit. This is known as the Gamma Lupi AB system, often abbreviated as γ Lupi AB or γ Lup AB. Gamma Lupi A is itself a spectroscopic binary with a period of 2.8081[9] days.

Gamma Lupi
Location of γ Lupi (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lupus
Right ascension 15h 35m 08.44835s[1]
Declination –41° 10′ 00.3247″[1]
Apparent magnitude (V) 2.77[2]
Characteristics
Spectral type B2 IV[3]
U−B color index –0.82[4]
B−V color index –0.20[4]
Astrometry
Radial velocity (Rv)+2.3[5] km/s
Proper motion (μ) RA: −15.62[1] mas/yr
Dec.: −25.43[1] mas/yr
Parallax (π)7.75 ± 0.50 mas[1]
Distance420 ± 30 ly
(129 ± 8 pc)
Absolute magnitude (MV)–2.4[2]
Orbit[6]
Period (P)190.0 yr
Semi-major axis (a)0.655″
Eccentricity (e)0.51
Inclination (i)95.0°
Longitude of the node (Ω)94.6°
Periastron epoch (T)1885.0
Argument of periastron (ω)
(secondary)		311.5°
Details
γ Lup A
Mass9.5±0.2[3] M☉
Luminosity5,000[2] L☉
Surface gravity (log g)3.96[2] cgs
Temperature20,900[2] K
Rotational velocity (v sin i)270[7] km/s
Age18.6±2.4[3] Myr
Other designations
Thusia[citation needed], γ Lup, CD−40° 9760, HD 138690, HIP 76297, HR 5776, SAO 225938[8]
Database references
SIMBADdata

This star is a proper motion member of the Upper Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[2]


See also



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, S2CID 18759600
  2. de Geus, E. J.; de Zeeuw, P. T.; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics, 216 (1–2): 44–61, Bibcode:1989A&A...216...44D
  3. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873
  4. 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
  5. Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E
  6. Hartkopf, W. I.; Mason, B. D.; Worley, C. E., Sixth Catalog of Orbits of Visual Binary Stars, archived from the original on 2011-05-17, retrieved 2010-11-10
  7. Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B
  8. "* gam Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-01-18.
  9. Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088

На других языках

- [en] Gamma Lupi

[es] Gamma Lupi

Gamma Lupi (γ Lup / HD 138690 / HR 5776)[1] es una estrella de magnitud aparente +2,77, la tercera más brillante de la constelación de Lupus, el lobo, sólo superada por α Lupi y β Lupi. Aunque sin denominación propia habitual, ocasionalmente es conocida como Thusia, nombre proveniente del griego Thusia Therou (θυσια θηριον), «el sacrificio animal».

[ru] Гамма Волка

Гамма Волка (лат. γ Lupi), HD 138690 — кратная звезда в созвездии Волка на расстоянии (вычисленном из значения параллакса) приблизительно 420 световых лет (около 129 парсеков) от Солнца. Возраст звезды определён как около 24 млн лет[10].


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