8 Leonis Minoris

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8 Leonis Minoris
Leo Minor constellation map.svg
Red circle.svg
Location of 8 Leonis Minoris (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Leo Minor
Right ascension 09h 31m 32.41045s [1]
Declination +35° 06′ 11.7793″ [1]
Apparent magnitude  (V)5.37 [2]
Characteristics
Evolutionary stage AGB [3]
Spectral type M1 IIIab [4]
U−B color index +1.81 [2]
B−V color index +1.53 [2]
Variable type suspected [5]
Astrometry
Radial velocity (Rv)39.83±0.18 [6]  km/s
Proper motion (μ)RA: −54.488  mas/yr [1]
Dec.: −97.434  mas/yr [1]
Parallax (π)6.6271 ± 0.0238  mas [1]
Distance 492 ± 2  ly
(150.9 ± 0.5  pc)
Absolute magnitude  (MV)−0.43 [7]
Details
Mass 1.59 [8]   M☉
Radius 48.5 [9]   R☉
Luminosity 417±17 [10]   L☉
Surface gravity (log g)1.153 [11]   cgs
Temperature 3,978±122 [12]   K
Metallicity [Fe/H]−0.25 [1]   dex
Other designations
8 Leonis Minoris, AG+35°938, BD+35°2015, GC  13133, HD  82198, HIP  46735, HR  3769, SAO  61450 [13]
Database references
SIMBAD data

8 Leonis Minoris (8 LMi) is a solitary, [14] red hued star located in the northern constellation Leo Minor. It has an apparent magnitude 5.37, [2] making it faintly visible to the naked eye. Based on parallax measurements from the Gaia satellite, the object is estimated to be 492 light years distant. [1] It is receding with a heliocentric radial velocity of 40  km/s . [6] At its current distance, 8 LMi is diminshed by 0.12 magnitudes due to interstellar dust. [15]

This is an asymptotic giant branch star [3] with stellar classification of M1 IIIab. [4] It has 1.59 times the mass of the Sun [8] but has expanded to 48.5 times its girth. [9] It radiates 417 times the luminosity of the Sun [10] from its enlarged photosphere at an effective temperature of 3,978  K . [12] 8 LMi has an iron abundance only half of the Sun's, making it metal deficient. [1]

8 LMi's variability was first observed to be variable in 1930 by Joel Stebbins. [16] However, Eggen (1967) instead lists it as an ordinary M-type giant and used the object for comparison. [17] In 1978-9, 8 LMi was again listed as a variable star but did not provide further insight. [18] As of 2017, the star has not been confirmed to be variable. [5]

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<span class="mw-page-title-main">HD 198716</span> Star in the constellation of Microscopium

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<span class="mw-page-title-main">V718 Coronae Australis</span> Slow irregular variable; Corona Australis

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<span class="mw-page-title-main">32 Leonis Minoris</span> Star in the constellation Leo Minor

32 Leonis Minoris, also known as HD 90840, is a solitary star located in the northern constellation Leo Minor. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.78. The object is located relatively far at a distance of 729 light-years based on Gaia DR3 parallax measurements and it is currently receding with a heliocentric radial velocity of 2 km/s, which is somewhat constrained. At its current distance, 32 LMi's brightness is diminished by 0.14 magnitudes due to interstellar extinction and it has an absolute magnitude of −1.02.

<span class="mw-page-title-main">HD 85709</span> Suspected variable in Sextans.

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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 3 4 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D.
  3. 1 2 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi: 10.1086/116239 . ISSN   0004-6256.
  4. 1 2 Yamashita, Y. (1967). "MK Spectral Types of Bright M-Type Stars". Publications of the Dominion Astrophysical Observatory Victoria. 13: 44. Bibcode:1967PDAO...13...47Y. ISSN   0078-6950.
  5. 1 2 Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN   1562-6881. ISSN   1063-7729. S2CID   125853869.
  6. 1 2 Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (18 February 2009). "Spectroscopic binaries among Hipparcos M giants". Astronomy & Astrophysics. 498 (2): 627–640. arXiv: 0901.0934 . Bibcode:2009A&A...498..627F. doi: 10.1051/0004-6361/200810698 . eISSN   1432-0746. ISSN   0004-6361.
  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 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2". Astronomy & Astrophysics. 623 (4): A72. arXiv: 1901.09170 . Bibcode:2019MNRAS.484.4619G. doi: 10.1051/0004-6361/201834371 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (20 December 2021). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  10. 1 2 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  11. ↑ Ghosh, Supriyo; Mondal, Soumen; Das, Ramkrishna; Khata, Dhrimadri (29 January 2019). "Spectral Calibration of K−M Giants from medium resolution near-infrared HK-band spectra". Monthly Notices of the Royal Astronomical Society. 484 (4): 4619. arXiv: 1901.09170 . Bibcode:2019MNRAS.484.4619G. doi: 10.1093/mnras/stz299 . eISSN   1365-2966. ISSN   0035-8711.
  12. 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.
  13. ↑ "8 Leonis Minoris". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 13, 2022.
  14. ↑ 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.
  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. ↑ Stebbins, Joel; Huffer, Charles Morse (1930). "The constancy of the light of red stars". Publications of the Washburn Observatory. 15: 140–174. Bibcode:1930PWasO..15..140S.
  17. ↑ Eggen, Olin J. (September 1967). "- and Broad-Band Photometry of Red Stars. Northern Giants". The Astrophysical Journal Supplement Series. 14: 307. Bibcode:1967ApJS...14..307E. doi: 10.1086/190158 . eISSN   1538-4365. ISSN   0067-0049.
  18. ↑ Pyl'skaja, O. P.; Zakharova, P. E.; Polushina, T. S. (December 1978). "V-R Colours of Red Variable Stars". Information Bulletin on Variable Stars. 1513: 1. Bibcode:1978IBVS.1513....1P. ISSN   0374-0676.
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