Astronomy:19 Leonis Minoris

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Short description: Spectroscopic binary in the constellation Leo Minor
19 Leonis Minoris
Leo Minor constellation map.svg
Red circle.svg
Location of 19 LMi (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Leo Minor
Right ascension  09h 57m 41.0544s[1]
Declination +41° 03′ 20.275″[1]
Apparent magnitude (V) 5.10±0.01[2]
Characteristics
Spectral type F6 V[3]
U−B color index 0.00[4]
B−V color index +0.46[4]
Astrometry
Radial velocity (Rv)−8.6±2.6[5] km/s
Proper motion (μ) RA: −116.432[1] mas/yr
Dec.: −25.860[1] mas/yr
Parallax (π)34.5809 ± 0.0926[1] mas
Distance94.3 ± 0.3 ly
(28.92 ± 0.08 pc)
Absolute magnitude (MV)+2.86[6]
Orbit[7]
Period (P)9.2835 d
Eccentricity (e)0.048[8]
Periastron epoch (T)2,443,858.21 JD
Argument of periapsis (ω)
(primary)		351[8]°
Semi-amplitude (K1)
(primary)		18.9 km/s
Semi-amplitude (K2)
(secondary)		25.3 km/s
Details
A
Mass1.29±0.19[9] M☉
Radius2±0.1[9] R☉
Luminosity6.41±0.04[1] L☉
Surface gravity (log g)3.98±0.03[10] cgs
Temperature6,483±80[11] K
Metallicity [Fe/H]+0.09[11] dex
Rotational velocity (v sin i)5[12] km/s
Age2.474[1] Gyr
B
Mass1.01[13] M☉
Other designations
19 LMi, BD+41°2033, FK5 374, GC 13700, GJ 3574, HD 86146, HIP 48833, HR 3928, SAO 43115[14]
Database references
SIMBADdata

19 Leonis Minoris (19 LMi) is a spectroscopic binary[15] located in the northern constellation Leo Minor. It has an apparent magnitude of 5.1,[2] making it one of the brighter members of the constellation. The system is relatively close at a distance of 94 light years[1] but is drifitng closer with a heliocentric radial velocity of 8.6 km/s.[5]

This spectroscopic binary can be classified as single lined[3] because only the primary's spectrum can be observed clearly, with it having a stellar classification of F6 V.[3] This makes it an ordinary F-type main-sequence star. The companion is probably a G-type main-sequence star of G0,[7] having a mass 101% that of the Sun.[13] The pair have a relatively circular orbit of about 9 days.[13]

19 LMi has 129% the mass of the Sun[9] and an effective temperature of 6,483 K, giving a yellow white hue. The object is somewhat evolved at an age of 2.5 billion years,[1] having a slightly enlarged radius of 2 R☉[9] and a luminosity of 6.4 L☉,[1] high for its class. 19 LMi has an iron abundance 123% that of the Sun,[11] making it slightly metal enriched. It spins modestly with a projected rotational velocity of 5 km/s.[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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. ↑ 2.0 2.1 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 Abt, Helmut A. (23 December 2008). "Mk Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement Series 180 (1): 117–118. doi:10.1088/0067-0049/180/1/117. ISSN 0067-0049. Bibcode: 2009ApJS..180..117A. 
  4. ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 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. 
  7. ↑ 7.0 7.1 Batten, A. H.; Morbey, C. L. (February 1980). "The orbital elements of 19 Leo Minoris". Publications of the Astronomical Society of the Pacific 92: 98. doi:10.1086/130625. ISSN 0004-6280. Bibcode: 1980PASP...92...98B. 
  8. ↑ 8.0 8.1 Kraicheva, Z.; Popova, E.; Tutukov, A.; Yungelson, L. (July 1980). "Catalogue of physical parameters of spectroscopic binary stars.". Bulletin d'Information du Centre de Donnees Stellaires 19: 71. ISSN 1169-8837. Bibcode: 1980BICDS..19...71K. 
  9. ↑ 9.0 9.1 9.2 9.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  10. ↑ Ramírez, I.; Allende Prieto, C.; Lambert, D. L. (29 January 2013). "Oxygen Abundances in Nearby FGK Stars and the Galactic Chemical Evolution of the Local Disk and Halo". The Astrophysical Journal 764 (1): 78. doi:10.1088/0004-637X/764/1/78. ISSN 0004-637X. Bibcode: 2013ApJ...764...78R. 
  11. ↑ 11.0 11.1 11.2 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics 530: A138. doi:10.1051/0004-6361/201016276. ISSN 0004-6361. Bibcode: 2011A&A...530A.138C. 
  12. ↑ 12.0 12.1 Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S. et al. (May 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs". Astronomy & Astrophysics 418 (3): 989–1019. doi:10.1051/0004-6361:20035959. ISSN 0004-6361. Bibcode: 2004A&A...418..989N. 
  13. ↑ 13.0 13.1 13.2 Tokovinin, Andrei (14 March 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal 147 (4): 87. doi:10.1088/0004-6256/147/4/87. ISSN 0004-6256. Bibcode: 2014AJ....147...87T. 
  14. ↑ "19 LMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=19+LMi. 
  15. ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G. et al. (23 August 2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy & Astrophysics 424 (2): 727–732. doi:10.1051/0004-6361:20041213. ISSN 0004-6361. Bibcode: 2004A&A...424..727P. 



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