Astronomy:23 Leonis Minoris

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Short description: Star in the constellation of Leo Minor
23 Leonis Minoris
Leo Minor constellation map.svg
Red circle.svg
Location of 23 LMi (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas/yr
Dec.: −22.844[1] mas/yr
Parallax (π)11.6971 ± 0.0923[1] mas
Distance279 ± 2 ly
(85.5 ± 0.7 pc)
Absolute magnitude (MV)+0.98[7]
Details
Mass2.55[8] M☉
Radius2.38±0.23[9] R☉
Luminosity44.3±2.1[3] L☉
Surface gravity (log g)4.14±0.07[10] cgs
Temperature10,377±353[8] K
Metallicity [Fe/H]0.00[11] dex
Rotational velocity (v sin i)235±15[12] km/s
Age285+24−22[13] Myr
Other designations
7 H. Leonis Minoris,[14] 23 LMi, BD+30°1981, FK5 2823, GC 14086, HD 88960, HIP 50303, HR 4024, SAO 81258[15]
Database references
SIMBADdata

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]

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. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  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. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 3.2 3.3 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars IV: Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 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. doi:10.1086/110819. ISSN 0004-6256. Bibcode: 1969AJ.....74..375C. 
  5. ↑ 5.0 5.1 Oja, T. (April 1983). "UVB photometry of FK4 and FK4 Supplement stars.". Astronomy and Astrophysics Supplement Series 52: 131–134. ISSN 0365-0138. Bibcode: 1983A&AS...52..131O. 
  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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  7. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D. 
  9. ↑ 9.0 9.1 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. doi:10.3847/1538-3881/aad050. Bibcode: 2018AJ....156..102S. 
  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. ISSN 0004-6361. Bibcode: 1999A&A...352..555A. 
  11. ↑ Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 1063-7737. Bibcode: 2012AstL...38..771G. 
  12. ↑ 12.0 12.1 12.2 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. doi:10.1086/192182. ISSN 0067-0049. Bibcode: 1995ApJS...99..135A. 
  13. ↑ 13.0 13.1 Grosbol, P. J. (June 1978). "Space velocities and ages of nearby early-type stars.". Astronomy and Astrophysics Supplement Series 32: 409–421. ISSN 0365-0138. Bibcode: 1978A&AS...32..409G. 
  14. ↑ 14.0 14.1 Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius". Astronomy and Astrophysics 516: A29. doi:10.1051/0004-6361/201014003. ISSN 0004-6361. Bibcode: 2010A&A...516A..29V. 
  15. ↑ "23 LMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=23+LMi. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  18. ↑ Eggen, Olin J. (October 1992). "The Hyades supercluster in the FK5". The Astronomical Journal 104: 1482. doi:10.1086/116333. ISSN 0004-6256. Bibcode: 1992AJ....104.1482E. 



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