Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Leo Minor |
Right ascension | 10h 33m 30.91104s[1] |
Declination | +34° 59′ 19.3006″[1] |
Apparent magnitude (V) | 5.58±0.01[2] |
Characteristics | |
Evolutionary stage | subgiant[3] |
Spectral type | A2 V[4] |
U−B color index | +0.04[4] |
B−V color index | +0.02[4] |
Astrometry | |
Radial velocity (Rv) | 7±10[5] km/s |
Proper motion (μ) | RA: −28.397 mas/yr[1] Dec.: −3.072 mas/yr[1] |
Parallax (π) | 6.3892 ± 0.0706 mas[1] |
Distance | 510 ± 6 ly (157 ± 2 pc) |
Absolute magnitude (MV) | −1.02[6] |
Details | |
Mass | 2.40±0.42[7] M☉ |
Radius | 4.85±0.25[8] R☉ |
Luminosity | 323+54 −46[3] L☉ |
Surface gravity (log g) | 3.50±0.25[7] cgs |
Temperature | 9,333+152 −149[3] K |
Metallicity [Fe/H] | −0.03[9] dex |
Rotational velocity (v sin i) | 165±8[10] km/s |
Age | 406+134 −172[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
34 Leonis Minoris (34 LMi), also known as HD 91365 or 11 H. Leonis Minoris is a solitary star[13] located in the northern constellation Leo Minor. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.58.[2] Gaia DR3 parallax measurements imply a distance of 510 light-years,[1] and it is currently receding with a poorly constrained heliocentric radial velocity of 7 km/s.[5] At its current distance, 34 LMi's brightness is diminished by interstellar extinction of 0.16 magnitudes and it has an absolute magnitude of −1.02.[6]
The object has received several stellar classifications over the years. Most sources generally agree that it is an early A-type main-sequence star with the classes ranging from A0 to A2.[4][14][10] Anne Cowley and colleagues found that 34 LMi has broad or nebulous absorption lines in its spectrum,[15] which could be a result of rapid rotation. However, D. R. Palmer gave a class of A0 IV,[16] indicating that it is an evolved A-type subgiant.[16] Richard O. Gray and Robert F. Garrison found a class of A1 III-IV, indicating that it has a luminosity class intermediate between a subgiant and giant star.[17]
34 LMi has 2.4 times the mass of the Sun[7] and an enlarged radius of 4.85 R☉.[8] It radiates 323 times the luminosity of the Sun from its photosphere at an effective temperature of 9,333 K.[3] At the age of 406 million years[7] 34 LMi is 1.9% past its main sequence lifetime,[3] meaning that it has evolved to the subgiant branch. The star has a near-solar metallicity at [Fe/H] = −0.03 (93% solar).[9] Like many hot stars 34 LMi spins rapidly, having a projected rotational velocity of 165 km/s.[10]
References
[edit]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415. Bibcode:1991A&AS...89..415O. ISSN 0365-0138.
- ^ a b c d e Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. eISSN 1432-0746. ISSN 0004-6361. S2CID 55586789.
- ^ a b c d Osawa, Kiyoteru (July 1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars". The Astrophysical Journal. 130. American Astronomical Society: 159. Bibcode:1959ApJ...130..159O. doi:10.1086/146706. ISSN 0004-637X. S2CID 120004061.
- ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. eISSN 1521-3994. ISSN 0004-6337. S2CID 119323941.
- ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d e Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (25 July 2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 40. arXiv:1604.06456. Bibcode:2016AJ....152...40G. doi:10.3847/0004-6256/152/2/40. eISSN 1538-3881. S2CID 119179065.
- ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
- ^ a b c Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. ISSN 0067-0049. S2CID 120495962.
- ^ Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius: Machine-readable version and comparison with the modern Hipparcos Catalogue". Astronomy and Astrophysics. 516: A29. Bibcode:2010A&A...516A..29V. doi:10.1051/0004-6361/201014003. eISSN 1432-0746. ISSN 0004-6361. S2CID 54171435.
- ^ "34 Leonis Minoris". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 27, 2023.
- ^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
- ^ Cucchiaro, A.; Macau-Hercot, D.; Jaschek, M.; Jaschek, C. (July 1978). "Spectral classification from the ultraviolet line features of S2/68 spectra. III. Early A-type stars". Astronomy and Astrophysics Supplement Series. 33: 15–26. Bibcode:1978A&AS...33...15C. ISSN 0365-0138.
- ^ Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi:10.1086/110819. ISSN 0004-6256. S2CID 121555804.
- ^ a b Palmer, D. R.; Walker, E. N.; Jones, D. H. P.; Wallis, R. E. (1968). "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars". Royal Greenwich Observatory Bulletins. 135: 385. Bibcode:1968RGOB..135..385P. S2CID 119068648.
- ^ Gray, R. O.; Garrison, R. F. (December 1987). "The early A type stars - Refined MK classification, confrontation with Stroemgren photometry, and the effects of rotation". The Astrophysical Journal Supplement Series. 65. American Astronomical Society: 581. Bibcode:1987ApJS...65..581G. doi:10.1086/191237. ISSN 0067-0049.