93 Leonis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo[1] |
| Right ascension | 11h 47m 59.13595s[2] |
| Declination | +20° 13′ 08.1500″[2] |
| Apparent magnitude (V) | 4.522[3] |
| Characteristics | |
| Spectral type | G5III + A7V[4] |
| U−B color index | +0.28[5] |
| B−V color index | +0.9 / +0.2[4] |
| Variable type | RS CVn[6] |
| Astrometry | |
| Radial velocity (Rv) | 0.750 ± 0.05[7] km/s |
| Proper motion (μ) | RA: −145.49[2] mas/yr Dec.: −4.34[2] mas/yr |
| Parallax (π) | 14.02±0.23 mas[2] |
| Distance | 233 ± 4 ly (71 ± 1 pc) |
| Absolute magnitude (MV) | +0.23[1] |
| Orbit[4] | |
| Period (P) | 71.69 d |
| Semi-major axis (a) | 7.5±0.1 mas |
| Eccentricity (e) | 0 |
| Inclination (i) | 50.1±0.5° |
| Longitude of the node (Ω) | 138±1° |
| Periastron epoch (T) | JD 2447642.6 ± 0.2 |
| Argument of periastron (ω) (secondary) | 0° |
| Semi-amplitude (K1) (primary) | 29.67±0.29 km/s |
| Semi-amplitude (K2) (secondary) | 33.8±2.1 km/s |
| Details[4] | |
| 93 Leo Aa | |
| Mass | 2.25±0.29 M☉ |
| Radius | 9.1±0.5 R☉ |
| Luminosity | 49.4±3.4 L☉ |
| Temperature | 5,100±100 K |
| 93 Leo Ab | |
| Mass | 1.97±0.15 M☉ |
| Radius | 2.7±0.2 R☉ |
| Luminosity | 23.9±1.9 L☉ |
| Temperature | 7,800±200 K |
| Other designations | |
| DQ Leo, BD+21°2358, FK5 1304, HD 102509, HIP 57565, HR 4527, SAO 81998[6] | |
| Database references | |
| SIMBAD | data |
93 Leonis (93 Leo) is a binary star in the constellation Leo. Its apparent magnitude is 4.522.[3] Based on the system's parallax, 93 Leonis is located about 233 light-years (71 parsecs) away.[2]
93 Leonis is a double-lined spectroscopic binary. Two components are known to exist, because their spectral lines shift periodically, due to the Doppler effect. The two stars are a G-type red giant and an A-type main-sequence star.[4] They complete an orbit once every 71.69 days. The system is also known to be an RS Canum Venaticorum variable, due to its binarity.[6] For that reason, it has been given the variable star designation DQ Leonis.[6]
In Chinese astronomy, 93 Leonis is called 太子, Pinyin: Tàizǐ, meaning Crown Prince, because this star is marking itself and stand alone in Crown Prince asterism, Supreme Palace enclosure mansion (see : Chinese constellation).[9]
See also
References
- ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- ^ a b c d e f van Leeuwen, F.; et al. (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. S2CID 18759600.
- ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H.
- ^ a b c d e Hummel, C. A.; et al. (July 1995). "Orbits of Small Angular Scale Binaries Resolved with the Mark III Interferometer". Astronomical Journal. 110: 376. Bibcode:1995AJ....110..376H. doi:10.1086/117528.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b c d "* 93 Leo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 July 2017.
- ^ Halbwachs, J.-L.; Mayor, M.; Udry, S. (2012). "Double stars with wide separations in the AGK3 - I. Components that are themselves spectroscopic binaries". Monthly Notices of the Royal Astronomical Society. 422 (1): 14–24. Bibcode:2012MNRAS.422...14H. doi:10.1111/j.1365-2966.2012.20308.x.
- ^ Strassmeier, Klaus G.; Hall, Douglas S.; Boyd, Louis J.; Genet, Russell M. (January 1989). "Photometric Variability in Chromospherically Active Stars. III. The Binary Stars". The Astrophysical Journal Supplement Series. 69: 141–215. Bibcode:1989ApJS...69..141S. doi:10.1086/191310.
- ^ Ian Ridpath's Startales - Leo the Lion