Xi1 Lupi

Xi¹ Lupi
	The location of Xi1 Lupi (ξ1) in the constellation of Lupus (shown as a red target's bullseye)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Lupus
Right ascension	15h 56m 53.49808s
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 (Rv)	−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
	ξ1 Lup, CD−33° 10826A, HD 142629, HIP 78105, HR 5925, SAO 207144, WDS J15569-3358A.
Database references
SIMBAD	data

Xi¹ Lupi (ξ¹ Lup, ξ¹ Lupi) is a probable binary star^[8] in the southern constellation of Lupus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.1,^[2] and forms a visual double star with Xi² Lupi. Based upon an annual parallax shift of 23.60^[1] 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.^[9]

This star shows periodic radial velocity variations that can be best explained as a spectroscopic binary system.^[8] The visible component is an A-type main-sequence star with a stellar classification of A3 V.^[3] It has twice^[5] the mass of the Sun and shines with about 12^[6] times the Sun's luminosity from its outer atmosphere at an effective temperature of 9,206 K.^[5] The star is an estimated 237 million years old and is spinning with a projected rotational velocity of 78 km/s.^[5]

References

^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b ^c ^d 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.
^ ^a ^b 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h 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.
^ ^a ^b 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.
^ ^a ^b 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.

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f 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.

[Slawson1992-2] 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.

[Levato1975-3] 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.

[deBruijne2012-4] 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.

[David2015-5] ^ ^a ^b ^c ^d ^e ^f ^g ^h 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.

[Mcdonald2012-6] 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.

[SIMBAD-7] "ksi01 Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-08.

[Antolenno2006-8] 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.

[Brown1997-9] 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.

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Xi1 Lupi

References

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