Chi Lupi

χ Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 50m 57.5376s[1]
Declination −33° 37′ 37.796″[1]
Apparent magnitude (V) 3.957[1]
Characteristics
Spectral type B9.5V + A2Vm[2]
U−B color index −0.13[3]
B−V color index −0.04[3]
R−I color index −0.07[3]
Astrometry
Radial velocity (Rv)5 ± 20[1] km/s
Proper motion (μ) RA: −5.92[1] mas/yr
Dec.: −24.91[1] mas/yr
Parallax (π)15.86 ± 0.84 mas[1]
Distance210 ± 10 ly
(63 ± 3 pc)
Details[4]
χ Lup A
Mass2.84±0.12 M☉
Radius2.85±0.15 R☉
Luminosity63[5] L☉
Surface gravity (log g)4.08[5] cgs
Temperature10,200[5] K
Rotational velocity (v sin i)0[3] km/s
Age280±30 Myr
χ Lup B
Mass1.94±0.09 M☉
Radius1.75±0.18 R☉
Surface gravity (log g)4.2 cgs
Temperature9,200 K
Other designations
χ Lup, Chi Lupi, Chi Lup, 5 Lupi, 5 Lup, CD−33 10754, CPD−33 3933, FK5 586, GC 21281, HD 141556, HIP 77634, HR 5883, PPM 294334, SAO 207040.[1]
Database references
SIMBADdata

Chi Lupi (Chi Lup, χ Lupi, χ Lup) is a spectroscopic binary star in the constellation of Lupus.[1] It has an apparent visual magnitude of approximately 3.957.[1] The primary star in the binary is a mercury-manganese star of spectral type B9.5V; the secondary is a metallic-lined star of type A2Vm.[2]

This system is a proper motion member of the Upper Scorpius sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[5] The Upper Scorpius subgroup contains thousands of stars with an average age of 11 million years old at mean distances of 145 parsecs (470 light years).[6]

References

  1. ^ a b c d e f g h i j "chi Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 14, 2008.
  2. ^ a b On the Ga II and Ga III Resonance Lines and the Implication for Chemical Stratification in HgMn Stars, K. E. Nielsen et al., Astronomical Journal 130, #5 (November 2005), pp. 2312–2317, Bibcode:2005AJ....130.2312N, doi:10.1086/491703.
  3. ^ a b c d HR 5883, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line August 14, 2008.
  4. ^ Le Bouquin, J.-B.; Beust, H.; Duvert, G.; Berger, J. P.; Ménard, F.; Zins, G. (March 2013), "Masses and age of the chemically peculiar double-lined binary χ Lupi", Astronomy & Astrophysics, 551: 9, arXiv:1302.5014, Bibcode:2013A&A...551A.121L, doi:10.1051/0004-6361/201220454, S2CID 13860888, A121.
  5. ^ a b c d 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
  6. ^ Mark J. Pecaut; Eric E. Mamajek & Eric J. Bubar (February 2012). "A Revised Age for Upper Scorpius and the Star Formation History among the F-type Members of the Scorpius–Centaurus OB Association". Astrophysical Journal. 746 (2): 154. arXiv:1112.1695. Bibcode:2012ApJ...746..154P. doi:10.1088/0004-637X/746/2/154. S2CID 118461108.