Chi Lupi
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| 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[1] mas |
| Distance | 210 ± 10 ly (63 ± 3 pc) |
| Details | |
| Radius | 3.70[4] R☉ |
| Luminosity | 63[5] L☉ |
| Surface gravity (log g) | 4.08[5] cgs |
| Temperature | 10,200[5] K |
| Rotational velocity (v sin i) | 0[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 with mean distances of 145 parsecs (470 light years).[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 HD 141556 -- Spectroscopic binary, database entry, SIMBAD. Accessed on line August 14, 2008.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 3.2 3.3 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.
- ↑ HD 141556, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line August 14, 2008.
- ↑ 5.0 5.1 5.2 5.3 de Geus, P. T.; de Zeeuw; 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
- ↑ 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.
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