Sigma Leonis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Leo |
| Right ascension | 11h 21m 08.1943s[1] |
| Declination | +06° 01′ 45.558″[1] |
| Apparent magnitude (V) | 4.044[2] |
| Characteristics | |
| Spectral type | B9.5Vs[2] |
| U−B color index | –0.12[3] |
| B−V color index | –0.06[3] |
| Astrometry | |
| Radial velocity (Rv) | –5.3[4] km/s |
| Proper motion (μ) | RA: –91.76[1] mas/yr Dec.: –12.83[1] mas/yr |
| Parallax (π) | 15.24 ± 0.81[1]mas |
| Distance | 210 ± 10 ly (66 ± 3 pc) |
| Details | |
| Radius | 3.3[5]R☉ |
| Surface gravity (log g) | 3.83 ± 0.03[6] |
| Temperature | 10,250[5]K |
| Metallicity [Fe/H] | +0.0[5]dex |
| Rotational velocity (v sin i) | 70[7] km/s |
| Other designations | |
Sigma Leonis (σ Leo) is a blue-white 4th-magnitude star in the constellation Leo.
Sigma Leonis is of the spectral class B9.5Vs and has an apparent magnitude of +4.04.
References
- ^ a b c d e Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ a b c "sig Leo -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-23.
- ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode:1966CoLPL...4...99J.
- ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495.....
- ^ a b c Lipski, Ł.; Stȩpień, K. (March 2008). "Effective temperatures of magnetic chemically peculiar stars from full spectral energy distributions". Monthly Notices of the Royal Astronomical Society 385 (1): 481–492. arXiv:0712.3664. Bibcode:2008MNRAS.385..481L. doi:10.1111/j.1365-2966.2008.12856.x.
- ^ Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855
- ^ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1). Bibcode:1970CoAsi.239....1B.
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