30 Leonis Minoris

30 Leonis Minoris is a single[11] star in the northern constellation of Leo Minor. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.72.[2] The distance to this star, as estimated from parallax measurements, is 233 light years.[1] It is drifting away from the Earth with a heliocentric radial velocity of +13.7 km/s.[6]

30 Leonis Minoris
Location of 30 Leonis Minoris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Leo Minor
Right ascension  10h 25m 54.81535s[1]
Declination 33° 47′ 46.0309″[1]
Apparent magnitude (V) 4.72[2]
Characteristics
Spectral type kF0hF2mF2[3] or A9IIIa[4]
U−B color index +0.18[5]
B−V color index +0.25[5]
Astrometry
Radial velocity (Rv)+13.70[6] km/s
Proper motion (μ) RA: -73.66[1] mas/yr
Dec.: -59.21[1] mas/yr
Parallax (π)13.98 ± 0.21[1] mas
Distance233 ± 4 ly
(72 ± 1 pc)
Absolute magnitude (MV)0.45[2]
Details
Mass2.28[7] M☉
Radius4.182[8] R☉
Luminosity58[7] L☉
Surface gravity (log g)3.82[9] cgs
Temperature7,292[9] K
Metallicity [Fe/H]+0.19[9] dex
Rotational velocity (v sin i)34[7] km/s
Other designations
30 LMi, BD+34°2128, GC 14315, HD 90277, HIP 51056, HR 4090, SAO 62038[10]
Database references
SIMBADdata

This object has been catalogued as an Am star[12] and was given a stellar classification of kF0hF2mF2[3] by Abt and Morrell (1995). This notation indicates the calcium K line matches an F0 star, while the hydrogen and metal lines fit an F2 star. However, Gray et al. (2001) assigned it a class of A9IIIa,[4] matching an A-type giant star.

30 Leonis Minoris has 2.3[7] times the mass of the Sun and 4.2[8] times the Sun's radius. It has a moderate rate of spin, showing a projected rotational velocity of 34 km/s.[7] The star is radiating 58[7] times the Sun's luminosity from its photosphere at an effective temperature of 7,292 K.[9]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. Vizier catalog entry
  3. Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. Gray, R. O.; et al. (April 2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148–2158. Bibcode:2001AJ....121.2148G. doi:10.1086/319956.
  5. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  6. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. Vizier catalog entry
  8. Masana, E.; et al. (2006). "Effective temperature scale and bolometric corrections from 2MASS photometry". Astronomy and Astrophysics. 450 (2): 735. arXiv:astro-ph/0601049. Bibcode:2006A&A...450..735M. doi:10.1051/0004-6361:20054021. Vizier catalog entry
  9. Wu, Yue; et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014.
  10. "30 LMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-19.
  11. Eggleton, P. P.; Tokovinin, A. A. (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.
  12. Shorlin, S. L. S.; et al. (September 2002). "A highly sensitive search for magnetic fields in B, A and F stars". Astronomy and Astrophysics. 392: 637–652. Bibcode:2002A&A...392..637S. doi:10.1051/0004-6361:20021192.
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