40 Leonis Minoris

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40 Leonis Minoris
Leo Minor constellation map.svg
Red circle.svg
Location of 40 LMi (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Leo Minor
Right ascension 10h 43m 01.88241s [1]
Declination +26° 19′ 32.0287″ [1]
Apparent magnitude  (V)5.51±0.01 [2]
Characteristics
Evolutionary stage main sequence star [3]
Spectral type A4 Vn [4]
U−B color index +0.19 [5]
B−V color index +0.17 [5]
Astrometry
Radial velocity (Rv)10±4.3 [6] km/s
Proper motion (μ)RA: −98.971 mas/yr [1]
Dec.: −65.543 mas/yr [1]
Parallax (π)21.2215±0.0816  mas [1]
Distance 153.7 ± 0.6  ly
(47.1 ± 0.2  pc)
Absolute magnitude  (MV)+2.23 [7]
Details
Mass 1.69 [8]   M☉
Radius 1.54±0.04 [9]   R☉
Luminosity 14.3+1.8
−1.6 [3]   L☉
Surface gravity (log g)4.30±0.04 [9]   cgs
Temperature 7834±108 [10]   K
Metallicity [Fe/H]−0.15 [11]   dex
Rotational velocity (v sin i)211 [12]  km/s
Age 207 [8]   Myr
Other designations
14 H. Leonis Minoris, [13] 40 LMi, AG+26°1125, BD+27°1927, GC 14730, HD 92769, HIP 52422, HR 4189, SAO 81485, WDS J10430+2620A [14]
Database references
SIMBAD data

40 Leonis Minoris (40 LMi) is a white hued star located in the northern constellation Leo Minor. It is rarely called 14 H. Leonis Minoris, which is the designation given by Polish astronomer Johann Hevelius. [13]

It has an apparent magnitude of 5.51, [2] making it faintly visible to the naked eye. The object is located relatively close at a distance of 154 light years based on Gaia DR3 parallax measurements [1] but is receding with a somewhat constrained heliocentric radial velocity of 10  km/s . [6] At 40 LMi's current distance, its brightness is diminished by only 0.02 magnitudes due to interstellar dust. [15]

40 LMi is a chemically peculiar A-type main-sequence star with a stellar classification of A4 Vn. [4] This indicates that it is an A4 dwarf with nebulous absorption lines due to rapid rotation. It has 1.69 times the mass of the Sun [8] and 1.54 times its girth. [9] It radiates 14.3 times the luminosity of the Sun [3] from its photosphere at an effective temperature of 7,834  K . [10] The star is estimated to be 207 million years old, having completed 54.6% of its main sequence lifetime. [3] 40 LMi is slightly metal deficient and spins rapidly with a projected rotational velocity of 211  km/s . [12]

This star was part of a 2005 survey regarding proper motions from the Hipparcos satellite. [16] Its proper motion varied, indicating that an unseen companion may cause it. This led to Peter P. Eggleton and Andrei Tokovinin classifying it as an astrometric binary. [17] There also 3 optical companions located near 40 LMi. Their relative positions and brightness are listed below. [18]

40 Leonis Minoris' companions [18]
Companionmv PA (°)YearSep. (″)
B12.6108201523.8
C13.572201541.6
D13285201546.6

References

  1. 1 2 3 4 5 6 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. 1 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. 1 2 3 4 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. 1 2 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. 1 2 Osawa, Kiyoteru (July 1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of a0 V Stars". The Astrophysical Journal. 130: 159. Bibcode:1959ApJ...130..159O. doi: 10.1086/146706 . eISSN   1538-4357. ISSN   0004-637X.
  6. 1 2 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. 1 2 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. arXiv: 1501.03154 . Bibcode:2015ApJ...804..146D. doi: 10.1088/0004-637X/804/2/146 . eISSN   1538-4357.
  9. 1 2 3 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.
  10. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  11. ↑ Thevenin, F.; Vauclair, S.; Vauclair, G. (September 1986). "A new step towards the explanation of lithium-and beryllium-deficientF stars. I. The field stars". Astronomy and Astrophysics. 166: 216–224. Bibcode:1986A&A...166..216T. ISSN   0004-6361.
  12. 1 2 Wolff, S.; Simon, T. (July 1997). "The Angular Momentum of Main Sequence Stars and Its Relation to Stellar Activity". Publications of the Astronomical Society of the Pacific. 109: 759. Bibcode:1997PASP..109..759W. doi: 10.1086/133942 . eISSN   1538-3873. ISSN   0004-6280.
  13. 1 2 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.
  14. ↑ "40 LMi". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 15, 2022.
  15. ↑ 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.
  16. ↑ Makarov, V. V.; Kaplan, G. H. (May 2005). "Statistical Constraints for Astrometric Binaries with Nonlinear Motion". The Astronomical Journal. 129 (5): 2420–2427. Bibcode:2005AJ....129.2420M. doi:10.1086/429590. eISSN   1538-3881. ISSN   0004-6256.
  17. ↑ 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.
  18. 1 2 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . ISSN   0004-6256.
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