19 Leonis Minoris

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19 Leonis Minoris
Leo Minor constellation map.svg
Red circle.svg
Location of 19 LMi (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
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 mas/yr [1]
Dec.: −25.860 mas/yr [1]
Parallax (π)34.5809±0.0926  mas [1]
Distance 94.3 ± 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 periastron (ω)
(primary)		351 [8] °
Semi-amplitude (K1)
(primary)		18.9 km/s
Semi-amplitude (K2)
(secondary)		25.3 km/s
Details
A
Mass 1.29±0.19 [9]   M☉
Radius 2±0.1 [9]   R☉
Luminosity 6.41±0.04 [1]   L☉
Surface gravity (log g)3.98±0.03 [10]   cgs
Temperature 6,483±80 [11]   K
Metallicity [Fe/H]+0.09 [11]   dex
Rotational velocity (v sin i)5 [12]  km/s
Age 2.474 [1]   Gyr
B
Mass 1.01 [13]   M☉
Other designations
19 LMi , AG+41°966, BD+41°2033, FK5 374, GC 13700, GJ 3574, HD 86146, HIP 48833, HR 3928, SAO 43115 [14]
Database references
SIMBAD data

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 drifting 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 2 3 4 5 6 7 8 9 10 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 Abt, Helmut A. (23 December 2008). "Mk Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement Series. 180 (1): 117–118. Bibcode:2009ApJS..180..117A. doi:10.1088/0067-0049/180/1/117. eISSN   1538-4365. ISSN   0067-0049.
  4. 1 2 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. 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.
  6. ↑ 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.
  7. 1 2 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. Bibcode:1980PASP...92...98B. doi: 10.1086/130625 . eISSN   1538-3873. ISSN   0004-6280.
  8. 1 2 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. Bibcode:1980BICDS..19...71K. ISSN   1169-8837.
  9. 1 2 3 4 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 . ISSN   0004-6256.
  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. arXiv: 1301.1582 . Bibcode:2013ApJ...764...78R. doi: 10.1088/0004-637X/764/1/78 . eISSN   1538-4357. ISSN   0004-637X.
  11. 1 2 3 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. arXiv: 1103.4651 . Bibcode:2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276 . ISSN   0004-6361.
  12. 1 2 Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (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. arXiv: astro-ph/0405198 . Bibcode:2004A&A...418..989N. doi: 10.1051/0004-6361:20035959 . ISSN   0004-6361.
  13. 1 2 3 Tokovinin, Andrei (14 March 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal. 147 (4): 87. arXiv: 1401.6827 . Bibcode:2014AJ....147...87T. doi: 10.1088/0004-6256/147/4/87 . eISSN   1538-3881. ISSN   0004-6256.
  14. ↑ "19 LMi". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 25, 2022.
  15. ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (23 August 2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy & Astrophysics. 424 (2): 727–732. arXiv: astro-ph/0406573 . Bibcode:2004A&A...424..727P. doi: 10.1051/0004-6361:20041213 . eISSN   1432-0746. ISSN   0004-6361.
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