23 Leonis Minoris

23 Leonis Minoris (23 LMi) is a solitary,^[16] bluish-white hued star located in the northern constellation Leo Minor. It is positioned 7° south and 11" west from β Leonis Minoris. It is rarely called 7 H. Leonis Minoris, which is its Hevelius designation.^[14]

23 Leonis Minoris

Location of 23 LMi (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Leo Minor
Right ascension	10h 16m 14.43013s[1]
Declination	+29° 18′ 37.7075″[1]
Apparent magnitude (V)	5.49±0.01[2]
Characteristics
Evolutionary stage	main sequence star[3]
Spectral type	A0 Vn[4]
U−B color index	0.00[5]
B−V color index	+0.01[5]
Astrometry
Radial velocity (Rv)	16.4±2.8[6] km/s
Proper motion (μ)	RA: −70.765 mas/yr[1] Dec.: −22.844 mas/yr[1]
Parallax (π)	11.6971 ± 0.0923 mas[1]
Distance	279 ± 2 ly (85.5 ± 0.7 pc)
Absolute magnitude (MV)	+0.98[7]
Details
Mass	2.55[8] M☉
Radius	2.38±0.23[9] R☉
Luminosity	44.3±2.1[3] L☉
Surface gravity (log g)	4.14±0.07[10] cgs
Temperature	10,377±353[8] K
Metallicity [Fe/H]	0.00[11] dex
Rotational velocity (v sin i)	235±15[12] km/s
Age	285+24 −22[13] Myr
Other designations
7 H. Leonis Minoris,[14] 23 LMi, AG+29°1104, BD+30°1981, FK5 2823, GC 14086, HD 88960, HIP 50303, HR 4024, SAO 81258[15]
Database references
SIMBAD	data

The object has an apparent magnitude of 5.49, allowing it to be faintly visible to the naked eye. Based on parallax measurements from the Gaia satellite, it is estimated to be 279 light years distant. 23 LMi is receding from the Solar System with a fairly constrained radial velocity of 16 km/s.^{[citation needed]} At its current distance, the star's brightness is diminished by a tenth of a magnitude due to interstellar dust.^[17] 23 LMi's kinematics matches that of the Hyades moving group and it is considered a probable member.^[18]

23 LMi was catalogued as a chemically peculiar star with a stellar classification of A0 Vpn due to a lack of magnesium in its spectrum by Helmut Abt and Nidia Irene Morrell.^[12] However, A.P. Cowley and colleagues instead listed it as an ordinary A-type main-sequence star with nebulous absorption lines as a result of rapid rotation, with the class being A0 Vn.^[4] It has 2.55 times the mass of the Sun^[8] and is said to be 285 million years old,^[13] having completed 60.8% of its main sequence lifetime.^[3] It has double the radius of the Sun^[9] and shines with a luminosity 44.3 times that of the Sun^[3] from its photosphere at an effective temperature of 10,377 K.^[8] 42 LMi is currently spinning rapidly with a projected rotational velocity of 235 km/s.^[12]

References

1. 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.
2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
3. 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.
4. 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.
5. Oja, T. (April 1983). "UVB photometry of FK4 and FK4 Supplement stars". Astronomy and Astrophysics Supplement Series. 52: 131–134. Bibcode:1983A&AS...52..131O. ISSN 0365-0138.
6. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
7. 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.
8. David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357.
9. Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; et al. (20 August 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. eISSN 1538-3881.
10. Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. ISSN 0004-6361.
11. Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. eISSN 1562-6873. ISSN 1063-7737.
12. 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.
13. Grosbol, P. J. (June 1978). "Space velocities and ages of nearby early-type stars". Astronomy and Astrophysics Supplement Series. 32: 409–421. Bibcode:1978A&AS...32..409G. ISSN 0365-0138.
14. Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius". Astronomy and Astrophysics. 516: A29. Bibcode:2010A&A...516A..29V. doi:10.1051/0004-6361/201014003. eISSN 1432-0746. ISSN 0004-6361.
15. "23 LMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 November 2022.
16. 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.
17. Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711.
18. Eggen, Olin J. (October 1992). "The Hyades supercluster in the FK5". The Astronomical Journal. 104: 1482. Bibcode:1992AJ....104.1482E. doi:10.1086/116333. ISSN 0004-6256.