Mu Lupi

Mu Lupi (μ Lup) is a system of three or four[7] stars in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 4.29[2] and lies roughly 340 light years from the Sun.

Mu Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 18m 32.02296s[1]
Declination −47° 52′ 30.9957″[1]
Apparent magnitude (V) 4.29[2]
Characteristics
Spectral type B8 Ve[3]
U−B color index −0.41[2]
B−V color index −0.03[2]
Astrometry
Radial velocity (Rv)+14.90±1.78[4] km/s
Proper motion (μ) RA: −29.59[1] mas/yr
Dec.: −35.07[1] mas/yr
Parallax (π)9.72 ± 0.71[1] mas
Distance340 ± 20 ly
(103 ± 8 pc)
Absolute magnitude (MV)−0.57[5]
Details[3]
Mass4.42±0.20 M☉
Luminosity603 L☉
Surface gravity (log g)3.80±0.10 cgs
Temperature13,470±500 K
Rotational velocity (v sin i)280±20 km/s
Age112 Myr
Other designations
μ Lup, CD−47° 9860, FK5 , HD 135734, HIP 74911, HR 5683, SAO 225638, WDS J15185-4753AB.[6]
Database references
SIMBADdata

Two of the components of this system, A and B, form a pair with an angular separation of 1.1 arc seconds. As of 2014, no orbit has been published. Component C lies at an angular separation of 22.6 arc seconds from the AB pair, and may be a common proper motion companion. It is an A-type main sequence star with a classification of A2 V. A fourth component at an angular separation of 6.15 arc seconds from component A, may be a brown dwarf.[7]

References
  1. 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.
  2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. Levenhagen, R. S.; Leister, N. V. (2006), "Spectroscopic analysis of southern B and Be stars", Monthly Notices of the Royal Astronomical Society, 371: 252, arXiv:astro-ph/0606149, Bibcode:2006MNRAS.371..252L, doi:10.1111/j.1365-2966.2006.10655.x.
  4. 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, A61.
  5. Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics, 372: 152–164, arXiv:astro-ph/0103201, Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452.
  6. "* mu. Lup -- Be Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-08.
  7. Veramendi, M. E.; González, J. F. (July 2014), "Spectroscopic study of early-type multiple stellar systems. II. New binary subsystems", Astronomy & Astrophysics, 567: 10, arXiv:1405.1084, Bibcode:2014A&A...567A..35V, doi:10.1051/0004-6361/201423736, A35.
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