Xi1 Lupi - Misplaced Pages

Probable binary star system in the constellation Lupus For other stars with this Bayer designation, see ξ Lupi.

Xi Lupi
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
The location of Xi Lupi (ξ) in the constellation of Lupus (shown as a red target's bullseye)
Constellation	Lupus
Right ascension	15 56 53.49808
Declination	−33° 57′ 58.0129″
Apparent magnitude (V)	5.114
Characteristics
Spectral type	A3 V
U−B color index	0.069
B−V color index	0.116
Astrometry

Radial velocity (R_v)	−10.0±4.2 km/s
Proper motion (μ)	RA: +23.27 mas/yr Dec.: −37.85 mas/yr
Parallax (π)	23.60 ± 3.48 mas
Distance	approx. 140 ly (approx. 42 pc)

Details

Mass	2.01 `M`_☉
Luminosity	12 `L`_☉
Surface gravity (log g)	4.14±0.14 cgs
Temperature	9,206±313 K
Rotational velocity (v sin i)	78 km/s
Age	237 Myr

Other designations
ξ Lup, CD−33° 10826A, HD 142629, HIP 78105, HR 5925, SAO 207144, WDS J15569-3358A.
Database references
SIMBAD	data

Xi Lupi (ξ Lup, ξ Lupi) is a probable binary star in the southern constellation of Lupus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.1, and forms a visual double star with Xi Lupi. Based upon an annual parallax shift of 23.60 mas as seen from Earth, it is located around 140 light-years from the Sun. It is a member of the Upper Scorpius sub-group of the nearby Sco OB2 association.

This star shows periodic radial velocity variations that can be best explained as a spectroscopic binary system. The visible component is an A-type main-sequence star with a stellar classification of A3 V. It has twice the mass of the Sun and shines with about 12 times the Sun's luminosity from its outer atmosphere at an effective temperature of 9,206 K. The star is an estimated 237 million years old and is spinning with a projected rotational velocity of 78 km/s.

References

^ van Leeuwen, F. (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.
^ Slawson, Robert W.; Hill, Robert J.; Landstreet, John D. (September 1992), "A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association", Astrophysical Journal Supplement Series, 82 (1): 117–144, Bibcode:1992ApJS...82..117S, doi:10.1086/191711.
^ Levato, H. (January 1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics Supplement Series, 19: 91–99, Bibcode:1975A&AS...19...91L.
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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
"ksi01 Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-08.
^ Antonello, E.; et al. (January 2006), "Probable nonradial g-mode pulsation in early A-type stars", Astronomy and Astrophysics, 445 (1): L15 – L18, arXiv:astro-ph/0511491, Bibcode:2006A&A...445L..15A, doi:10.1051/0004-6361:200500216, S2CID 15557098.
Brown, A. G. A.; Verschueren, W. (March 1997), "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2", Astronomy and Astrophysics, 319: 811–838, arXiv:astro-ph/9608089, Bibcode:1997A&A...319..811B.

Constellation of Lupus

Stars

Bayer	α β γ δ ε ζ η θ ι κ κ λ μ ν ν ξ ξ ο π ρ σ τ τ υ φ φ χ ψ ψ ω
Flamsteed	1 (i) 2 (f)
Variable	RU EX GG GQ HR II IL IM KT (d) V407
HR	5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967
HD	134004 142527
Other	Gliese 588 HIP 70849 Lupus-TR-3 SAO 206462 SSSPM J1549-3544 WASP-132

Exoplanets	GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b

Star clusters	NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986

Nebulae	IC 4406 NGC 5882

Galaxies	NGC 5643