Gliese 908

A visual band light curve for BR Piscium, plotted from ASAS-SN data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Pisces
Right ascension 23h 49m 12.52790s[2]
Declination 02° 24′ 04.4072″[2]
Apparent magnitude (V) 8.93 - 9.03[3]
Characteristics
Spectral type M1V Fe-1[4]
Variable type BY Dra[3]
Astrometry
Radial velocity (Rv) −71.79[5] km/s
Proper motion (μ) RA: 992.665[5] mas/yr
Dec.: −968.648[5] mas/yr
Parallax (π) 169.2163 ± 0.0281 mas[6]
Distance 19.275 ± 0.003 ly
(5.9096 ± 0.0010 pc)
Absolute magnitude (MV) +10.1[7]
Details
Mass 0.37[8] M☉
Radius 0.39[9] R☉
Luminosity (bolometric) 0.022[9] L☉
Surface gravity (log g) 4.86[9] cgs
Temperature 3,570[9] K
Metallicity [Fe/H] −0.51±0.05[10] dex
Rotational velocity (v sin i) 2.25[11] km/s
Other designations
BR Piscium, BD+01°4774, GJ 908[12], HIP 117473[2], SAO 128397, PPM 174453, G 29-68, G 31-6, LHS 550[13], LTT 17014, PLX 5763[14], TYC 586-610-1[15], GSC 00586-00610, IRAS 23466+0207, 2MASS J23491255+0224037
Database references
SIMBAD data
Gliese 908 is located in the constellation Pisces
Gliese 908 is located in the constellation Pisces
Gliese 908
Location of Gliese 908 in the constellation Pisces

Gliese 908 is a red dwarf star, located in constellation Pisces at 19.3 light-years from Earth. It is a BY Draconis variable star with a variable star designation of BR Piscium. Its apparent magnitude varies between magnitude 8.93 and magnitude 9.03 as a result of starspots and varying chromospheric activity.

The variability of Gliese 908 was confirmed in 1994, although no period could be detected in its brightness changes.[16] It was entered into the General Catalogue of Variable Stars in 1997.[17]

Gliese 908 is a cool main sequence star, a red dwarf, with a spectral class of M1V Fe-1. The suffix indicates a noticeable deficiency in heavy elements.[4]

References

  1. ^ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 6 January 2022.
  2. ^ a b c Perryman; et al. (1997). "HIP 117473". The Hipparcos and Tycho Catalogues.
  3. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  4. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  5. ^ a b c 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.
  6. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  7. ^ Boro Saikia, S.; et al. (2018), "Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles", Astronomy and Astrophysics, 616: A108, arXiv:1803.11123, Bibcode:2018A&A...616A.108B, doi:10.1051/0004-6361/201629518, S2CID 118915212.
  8. ^ Perger, M.; García-Piquer, A.; Ribas, I.; Morales, J. C.; Affer, L.; Micela, G.; Damasso, M.; Suárez-Mascareño, A.; González-Hernández, J. I.; Rebolo, R.; Herrero, E.; Rosich, A.; Lafarga, M.; Bignamini, A.; Sozzetti, A.; Claudi, R.; Cosentino, R.; Molinari, E.; Maldonado, J.; Maggio, A.; Lanza, A. F.; Poretti, E.; Pagano, I.; Desidera, S.; Gratton, R.; Piotto, G.; Bonomo, A. S.; Martinez Fiorenzano, A. F.; Giacobbe, P.; et al. (2017). "HADES RV Programme with HARPS-N at TNG. II. Data treatment and simulations". Astronomy and Astrophysics. 598: A26. arXiv:1610.08698. Bibcode:2017A&A...598A..26P. doi:10.1051/0004-6361/201628985. S2CID 56341358.
  9. ^ a b c d Maldonado, J.; Affer, L.; Micela, G.; Scandariato, G.; Damasso, M.; Stelzer, B.; Barbieri, M.; Bedin, L. R.; Biazzo, K.; Bignamini, A.; Borsa, F.; Claudi, R. U.; Covino, E.; Desidera, S.; Esposito, M.; Gratton, R.; González Hernández, J. I.; Lanza, A. F.; Maggio, A.; Molinari, E.; Pagano, I.; Perger, M.; Pillitteri, I.; Piotto, G.; Poretti, E.; Prisinzano, L.; Rebolo, R.; Ribas, I.; Shkolnik, E.; et al. (2015). "Stellar parameters of early-M dwarfs from ratios of spectral features at optical wavelengths". Astronomy and Astrophysics. 577: A132. arXiv:1503.03010. Bibcode:2015A&A...577A.132M. doi:10.1051/0004-6361/201525797. S2CID 53582613.
  10. ^ Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics. 604: A97. arXiv:1705.08785. Bibcode:2017A&A...604A..97L. doi:10.1051/0004-6361/201730715. S2CID 119216828.
  11. ^ Houdebine, E. R. (2010). "Observation and modelling of main-sequence star chromospheres - XIV. Rotation of dM1 stars". Monthly Notices of the Royal Astronomical Society. 407 (3): 1657–1673. Bibcode:2010MNRAS.407.1657H. doi:10.1111/j.1365-2966.2010.16827.x.
  12. ^ Gliese, W.; Jahreiß, H. (1991). "Gl 908". Preliminary Version of the Third Catalogue of Nearby Stars.
  13. ^ Luyten, Willem Jacob (1979). "LHS 550". LHS Catalogue, 2nd Edition.
  14. ^ Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 5763". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.).
  15. ^ Perryman; et al. (1997). "HIP 117473". The Hipparcos and Tycho Catalogues.
  16. ^ Weis, Edward W. (1994). "Long Term Variability in Dwarf M Stars". The Astronomical Journal. 107: 1135. Bibcode:1994AJ....107.1135W. doi:10.1086/116925.
  17. ^ Kazarovets, E. V.; Samus, N. N. (1997). "The 73rd Name-List of Variable Stars". Information Bulletin on Variable Stars. 4471: 1. Bibcode:1997IBVS.4471....1K.