Gamma Lupi
{{Short description|Triple star system in the constellation Lupus}}
{{Starbox begin}}
{{Starbox image
| image =
{{Location mark
| image=Lupus IAU.svg
| float=center | width=240 | position=right
| mark=Red circle.svg | mark_width=10 | mark_link=γ Lup
| x%=43.1 | y%=44.5
}}
| caption = Location of γ Lupi (circled)
}}
{{Starbox observe
| epoch = J2000.0
| constell = Lupus
| dec = {{DEC|–41|10|00.3247}}
}}
{{Starbox character
| variable =
}}
{{Starbox astrometry
| parallax = 7.75
| p_error = 0.50
}}
{{Starbox orbit
| primary = Aa
| name = Ab
| period_unitless = 2.85 days
| axis_unitless = {{val|16.0|-|19.3|ul=solar radius}}
| eccentricity = 0
| k1 = {{val|26.7|1.0}}
}}
{{Starbox orbit
| primary = A
| name = B
| period = {{Val|167.3|21.5|7.2}}
| axis_unitless = {{Val|0.970|0.343|0.240|ul="}}
(125 AU)
| eccentricity= {{Val|0.826|0.082|0.181}}
| inclination = {{Val|93.04|1.45|0.89}}
| node = {{Val|91.20|0.52|0.35}}
| periastron = {{Val|1885.7|2.9|4.0|fmt=none}}
| periarg = {{Val|286.9|12.0|5.9}}
}}
{{Starbox detail
| component1 = γ Lup Aa
| mass = {{val|6|-|10}}
| radius = {{Val|3.92|-|5.39}}
| luminosity = {{val|2570|-|4700|fmt=commas}}
| gravity = {{Val|3.867|-|4.130}}
| age_myr = {{val|16.7|5.0|6.6}}
| component2 = γ Lup Ab
| mass2 = {{Val|0.72|-|1.93}}
| luminosity2 = {{val|2.39|-|10.7}}
| radius2 = {{val|2.00|-|3.47}}
| temperature2= {{val|4140|-|7210|fmt=commas}}
| gravity2 = {{val|3.515|-|3.803}}
}}
{{Starbox catalog
| names = {{odlist | B=γ Lup | CD=−40° 9760 | HD=138690 | HIP=76297 | HR=5776 | SAO=225938 }}
}}
{{Starbox reference
| Simbad = gam+Lup
}}
{{Starbox end}}
Gamma Lupi, Latinized from γ Lupi, is a triple star system in the constellation of Lupus. It is easily visible to the naked eye, having an apparent magnitude of 2.77. 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.
File:GammaLupLightCurve.png for Gamma Lupi, plotted from TESS data]]
The system has a hierarchical architecture. The primary, Gamma Lupi A is itself a spectroscopic binary with an orbital period of 2.849769 days. Although the system does not show eclipses, the hotter star of the pair heats the side of the cooler star that faces it, and as they orbit each other the combined starlight varies in brightness by about 0.02 magnitudes, as seen from the Earth. The outer component, Gamma Lupi B, is widely-separated (125 astronomical units) and has an orbital period of 170 years.
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.
{{clear left}}
See also
References
{{Reflist|30em|refs=
{{cite simbad | title=* gam Lup | access-date=2007-01-18 }}
{{citation | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=1 | pages=190–200 |date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T |arxiv = 1007.4883 | s2cid=118629873 }}
{{citation | last=Evans | first=D. S. | date=June 20–24, 1966 | editor1-last=Batten | editor1-first=Alan Henry | editor2-last=Heard | editor2-first=John Frederick | title=The Revision of the General Catalogue of Radial Velocities | work=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | volume=30 | page=57 | location=University of Toronto | publisher=International Astronomical Union | bibcode=1967IAUS...30...57E }}
}}
{{Stars of Lupus}}
Category:Upper Centaurus Lupus