7 Leonis Minoris

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7 Leonis Minoris
Leo Minor constellation map.svg
Red circle.svg
Location of 7 LMi on the map (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Leo Minor
Right ascension 09h 30m 43.22705s [1]
Declination +33° 39′ 20.5700″ [1]
Apparent magnitude  (V)5.86±0.01 [2]
Characteristics
Evolutionary stage horizontal branch [3]
Spectral type G9 III [4]
B−V color index +1.05 [5]
Astrometry
Radial velocity (Rv)1.7±0.9 [6] km/s
Proper motion (μ)RA: −23.939 mas/yr [1]
Dec.: −48.160 mas/yr [1]
Parallax (π)7.0542±0.1338  mas [1]
Distance 462 ± 9  ly
(142 ± 3  pc)
Absolute magnitude  (MV)−0.03 [7]
Details
Mass 2.74+0.24
−0.25 [3]   M☉
Radius 13.41±0.68 [8]   R☉
Luminosity 96.0+3.3
−3.6 [1]   L☉
Surface gravity (log g)2.49+0.07
−0.06 [3]   cgs
Temperature 4,923±122 [9]   K
Metallicity [Fe/H]−0.03±0.10 [10]   dex
Rotational velocity (v sin i)0.24 [11]  km/s
Age 575+201
−139 [3]   Myr
Other designations
7 LMi, AG+33°953, BD+34°1999, FK5 2755, GC 13112, HD 82087, HIP 46652, HR 3764, SAO 61529, CCDM J09307+3339A, WDS J09307+3339A, TIC 8855140 [12]
Database references
SIMBAD data

7 Leonis Minoris (7 LMi) is a star located in the northern constellation Leo Minor. It is also designated as HD 82087 and HR 3764. 7 LMi is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.86. [2] Gaia DR3 parallax measurements imply a distance of 462 light-years [1] and it is currently receding with a heliocentric radial velocity of 1.7  km/s . [6] At its current distance, 7 LMi's brightness is diminished by 0.12 magnitudes due to interstellar extinction [13] and it has an absolute magnitude of −0.03. [7]

There have been disagreements on the object's stellar classification. 7 LMi is either a G-type giant star with a class of either G8 or G9 III, [4] or it is a K-type giant with a class of K0 III. [14] It is most likely on the horizontal branch (95% fit), [3] generating energy via helium fusion at its core. It has 2.74 times the mass of the Sun but at the age of 575 million years, [3] it has expanded to 13.41 times the radius of the Sun. [8] It radiates 96 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,923  K . [9] 7 LMi has a near solar metallicity at [Fe/H] = −0.03 [10] and it spins very slowly with a projected rotational velocity of 0.24  km/s . [11]

7 LMi has two visual companions. AG +33°954 is a background star located much farther away than 7 LMi [15] and it is a close spectroscopic binary itself. [16]

7 Leonis Minoris' companions [17]
Companion Stellar classification PA (deg)Separation (arcsec)Apparent magnitude
AG +33°954 (B)G8 IV-V [4] 12561.39.7
CG5 V [4] 21795.911.6

References

  1. 1 2 3 4 5 6 7 8 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. S2CID   17128864.
  3. 1 2 3 4 5 6 Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas (August 2018). "Precise radial velocities of giant stars: X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search". Astronomy & Astrophysics. 616: A33. arXiv: 1805.04094 . Bibcode:2018A&A...616A..33S. doi: 10.1051/0004-6361/201833111 . ISSN   0004-6361. S2CID   247657118.
  4. 1 2 3 4 Abt, H. A. (May 1986). "The ages and dimensions of Trapezium systems". The Astrophysical Journal. 304. American Astronomical Society: 688. Bibcode:1986ApJ...304..688A. doi:10.1086/164207. ISSN   0004-637X. S2CID   121295060.
  5. ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode:1970Priv.........0H. S2CID   231475662.
  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. 1 2 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 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361.
  9. 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.
  10. 1 2 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (December 15, 2014). "Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity". Astronomy & Astrophysics. 574. EDP Sciences: A116. arXiv: 1412.4634 . Bibcode:2015A&A...574A.116R. doi: 10.1051/0004-6361/201322360 . ISSN   0004-6361. S2CID   59334290.
  11. 1 2 Hekker, S.; Meléndez, J. (December 2007). "Precise radial velocities of giant stars: III. Spectroscopic stellar parameters". Astronomy & Astrophysics. 475 (3): 1003–1009. arXiv: 0709.1145 . Bibcode:2007A&A...475.1003H. doi: 10.1051/0004-6361:20078233 . ISSN   0004-6361. S2CID   10436552.
  12. ↑ "* 7 LMi". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved August 8, 2023.
  13. ↑ 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. S2CID   118879856.
  14. ↑ Pertersson, J. H. (1927). "Distribution of stars in Carrington zone". Meddelanden Fran Astronomiska Observatorium Uppsala. 29: 1. Bibcode:1927MeUpp..29....1P.
  15. ↑ 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.
  16. ↑ Gaia Collaboration (2022). "VizieR Online Data Catalog: Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1357....0G.
  17. ↑ 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. S2CID   119533755.
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