11 Leonis Minoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo Minor |
| Right ascension | 09h 35m 39.50337s[1] |
| Declination | +35° 48′ 36.4874″[1] |
| Apparent magnitude (V) | 4.80/12.50[2] |
| Characteristics | |
| Spectral type | G8V[2] + M5V |
| U−B color index | 0.44/— |
| B−V color index | 0.77/— |
| Variable type | RS CVn |
| Astrometry | |
| Radial velocity (Rv) | +14.40[3] km/s |
| Proper motion (μ) | RA: -728.71[1] mas/yr Dec.: -259.81[1] mas/yr |
| Parallax (π) | 87.96 ± 0.32[1] mas |
| Distance | 37.1 ± 0.1 ly (11.37 ± 0.04 pc) |
| Orbit[2] | |
| Companion | 11 LMi B |
| Period (P) | 201 yr |
| Semi-major axis (a) | 3.84" |
| Eccentricity (e) | 0.88 |
| Inclination (i) | 117° |
| Details | |
| 11 LMi A | |
| Mass | 0.964[4] M☉ |
| Radius | 1.0029 ± 0.0158[4] R☉ |
| Luminosity | 0.7550 ± 0.0055[4] L☉ |
| Temperature | 5376 ± 43[4] K |
| Metallicity [Fe/H] | +0.33[5] dex |
| Rotation | 18.0 days[5] |
| Age | 7.9[4] Gyr |
| 11 LMi B | |
| Mass | 0.23[6] M☉ |
| Other designations | |
11 Leonis Minoris (11 LMi) is a star system located 37 light years away from Earth, in the northern constellation of Leo Minor. The primary component is a G-type main sequence star of spectral type G8V, which is slightly more massive but slightly dimmer than Sol. This is an RS Canum Venaticorum variable star with its luminosity varying by 0.033 magnitudes over a period of 18 days.[8] Compared to the Sun, it has more than double the abundance of elements more massive than helium—what astronomers term the star's metallicity.[5]
There is a secondary component, a red dwarf star much dimmer than the primary. It has a highly eccentric orbit ranging from roughly 4 AU to 63 AU from the primary.
Popular culture
John J. Lumpkin used the star system in his novel Through Struggle, the Stars.
References
- 1 2 3 4 5 van Leeuwen, F. (November 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 - 1 2 3 Malkov, O. Yu.; et al. (2012), "Dynamical masses of a selected sample of orbital binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
- ↑ Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788
- 1 2 3 4 5 Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 40, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40.
- 1 2 3 Maldonado, J.; et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics, 521: A12, arXiv:1007.1132, Bibcode:2010A&A...521A..12M, doi:10.1051/0004-6361/201014948
- ↑ Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, 87.
- ↑ "11 LMi -- Variable of RS CVn type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2015-06-02.
- ↑ Skiff, B. A.; et al. (March 1986), "The photometric variability of solar-type stars. V - The standard stars 10 and 11 Leonis Minoris", Publications of the Astronomical Society of the Pacific, 98: 338–341, Bibcode:1986PASP...98..338S, doi:10.1086/131763
External links
- "Binary Catalog". Retrieved April 4, 2007.
- "SIMBAD query". Retrieved April 4, 2007.