Astronomy:Mu Lupi
| Observation data 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 (AB) + A2/3(V) (C)[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 |
| Distance | 340 ± 20 ly (103 ± 8 pc) |
| Absolute magnitude (MV) | −0.57[5] |
| Orbit[3] | |
| Primary | A |
| Companion | B |
| Period (P) | 772 yr |
| Semi-major axis (a) | 1.657″ |
| Eccentricity (e) | 0.43 |
| Inclination (i) | 114.6° |
| Periastron epoch (T) | 2048 |
| Orbit[6] | |
| Primary | Ca |
| Companion | Cb |
| Period (P) | 12.353±0.004 days |
| Eccentricity (e) | 0.4±0.1 |
| Periastron epoch (T) | 2,455,177.7 JD |
| Argument of periapsis (ω) (primary) | 324±18° |
| Semi-amplitude (K1) (primary) | 2.4±0.4 km/s |
| Details[3] | |
| A | |
| Mass | 3.16 M☉ |
| Rotational velocity (v sin i) | 280 km/s |
| B | |
| Mass | 3.07 M☉ |
| Rotational velocity (v sin i) | 50 km/s |
| Ca | |
| Mass | 1.78 M☉ |
| Temperature | 8,500[6] K |
| Cb | |
| Mass | 0.05[6] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Mu Lupi (μ Lup) is a system of three confirmed stars and one brown dwarf[3] 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.
Two of the components of this system, A and B, form a pair with an angular separation of 1.657 arcseconds. An orbital solution gives an orbital period of 772 years. Component C, an A-type main-sequence star, lies at an angular separation of 23.3 arcseconds from the AB pair,[3] and is itself a binary with an orbital period of 12.35 days. Its companion has a mass of 0.05 M☉, too low to fuse hydrogen, and thus it is considered a brown dwarf.[6] A fifth component, not confirmed to be a physical companion, lies at an angular separation of 6.10 arcseconds from component AB, and with a mass of 0.05 M☉ is also a brown dwarf.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Template:Ciation. Mu Lupi's database entry at VizieR.
- ↑ 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 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, doi:10.1051/0004-6361:20010452, Bibcode: 2001A&A...372..152H.
- ↑ 6.0 6.1 6.2 6.3 Veramendi, M. E.; González, J. F. (July 2014), "Spectroscopic study of early-type multiple stellar systems. II. New binary subsystems", Astronomy & Astrophysics 567: 10, doi:10.1051/0004-6361/201423736, A35, Bibcode: 2014A&A...567A..35V.
- ↑ "* mu. Lup -- Be Star". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+mu.+Lup+--+Be+Star.
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