Astronomy:Gliese 908

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Short description: Star in the constellation Pisces

Coordinates: Sky map 23h 49m 12.52790s, +02° 24′ 04.4072″

Gliese 908
320px
A visual band light curve for BR Piscium, plotted from ASAS-SN data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pisces
Right ascension  23h 49m 12.52508s[2]
Declination 02° 24′ 04.4055″[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)−71.37±0.12[2] km/s
Proper motion (μ) RA: +992.720[2] mas/yr
Dec.: −968.806[2] mas/yr
Parallax (π)169.2163 ± 0.0281[2] mas
Distance19.275 ± 0.003 ly
(5.9096 ± 0.0010 pc)
Absolute magnitude (MV)+10.1[5]
Details
Mass0.37[6] M☉
Radius0.409±0.023[7] R☉
Luminosity (bolometric)0.0253±0.0006[7] L☉
Surface gravity (log g)4.86[8] cgs
Temperature3,600±100[7] K
Metallicity [Fe/H]−0.51±0.05[9] dex
Rotation50.83±0.35[10] days
Rotational velocity (v sin i)2.25[11] km/s
Other designations
BR Piscium, BD+01°4774, GJ 908[12], HIP 117473[13], SAO 128397, PPM 174453, G 29-68, G 31-6, LHS 550[14], LTT 17014, PLX 5763[15], TYC 586-610-1[16], GSC 00586-00610, IRAS 23466+0207, 2MASS J23491255+0224037, Lalande 46650
Database references
SIMBADdata
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.[17] It was entered into the General Catalogue of Variable Stars in 1997.[18]

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. https://asas-sn.osu.edu/variables/lookup. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Samus, N. N. 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. ↑ 4.0 4.1 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. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K. 
  5. ↑ 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. doi:10.1051/0004-6361/201629518. Bibcode: 2018A&A...616A.108B. 
  6. ↑ Perger, M.; García-Piquer, A.; Ribas, I.; Morales, J. C.; Affer, L.; Micela, G.; Damasso, M.; Suárez-Mascareño, A. et al. (2017). "HADES RV Programme with HARPS-N at TNG. II. Data treatment and simulations". Astronomy and Astrophysics 598: A26. doi:10.1051/0004-6361/201628985. Bibcode: 2017A&A...598A..26P. 
  7. ↑ 7.0 7.1 7.2 Kesseli, Aurora Y. et al. (February 2019). "Radii of 88 M Subdwarfs and Updated Radius Relations for Low-metallicity M-dwarf Stars". The Astronomical Journal 157 (2): 17. doi:10.3847/1538-3881/aae982. 63. Bibcode: 2019AJ....157...63K. 
  8. ↑ Maldonado, J.; Affer, L.; Micela, G.; Scandariato, G.; Damasso, M.; Stelzer, B.; Barbieri, M.; Bedin, L. R. et al. (2015). "Stellar parameters of early-M dwarfs from ratios of spectral features at optical wavelengths". Astronomy and Astrophysics 577: A132. doi:10.1051/0004-6361/201525797. Bibcode: 2015A&A...577A.132M. 
  9. ↑ Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics 604: A97. doi:10.1051/0004-6361/201730715. Bibcode: 2017A&A...604A..97L. 
  10. ↑ Kemmer, J.; Lafarga, M.; Fuhrmeister, B.; Shan, Y.; Schöfer, P.; Jeffers, S. V.; Caballero, J. A.; Quirrenbach, A. et al. (2025-04-11). "The CARMENES search for exoplanets around M dwarfs. Cluster analysis of signals from spectral activity indicators to search for shared periods". Astronomy and Astrophysics 697. doi:10.1051/0004-6361/202347056. Bibcode: 2025A&A...697A.225K. 
  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. doi:10.1111/j.1365-2966.2010.16827.x. Bibcode: 2010MNRAS.407.1657H. 
  12. ↑ "Gl 908". Preliminary Version of the Third Catalogue of Nearby Stars. 1991. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=V/70A&Name=Gl%20908. 
  13. ↑ Perryman (1997). "HIP 117473". The Hipparcos and Tycho Catalogues. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/hip_main&HIP=117473. 
  14. ↑ Luyten, Willem Jacob (1979). "LHS 550". LHS Catalogue, 2nd Edition. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/87B&LHS=550. 
  15. ↑ "GCTP 5763". The General Catalogue of Trigonometric Stellar Parallaxes. 1995. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/238A/picat&GCTP=5763. 
  16. ↑ Perryman (1997). "HIP 117473". The Hipparcos and Tycho Catalogues. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/tyc_main&HIP=117473. 
  17. ↑ Weis, Edward W. (1994). "Long Term Variability in Dwarf M Stars". The Astronomical Journal 107: 1135. doi:10.1086/116925. Bibcode: 1994AJ....107.1135W. 
  18. ↑ 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. 



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