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Gliese 908 
Summary
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.
| 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 | |
| Database references | |
| SIMBAD | data |
  Gliese 908 Location of Gliese 908 in the constellation Pisces | |
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 edit
- ^ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 6 January 2022.
- ^ a b c Perryman; et al. (1997). "HIP 117473". The Hipparcos and Tycho Catalogues.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Gliese, W.; Jahreiß, H. (1991). "Gl 908". Preliminary Version of the Third Catalogue of Nearby Stars.
- ^ Luyten, Willem Jacob (1979). "LHS 550". LHS Catalogue, 2nd Edition.
- ^ Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 5763". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.).
- ^ Perryman; et al. (1997). "HIP 117473". The Hipparcos and Tycho Catalogues.
- ^ Weis, Edward W. (1994). "Long Term Variability in Dwarf M Stars". The Astronomical Journal. 107: 1135. Bibcode:1994AJ....107.1135W. doi:10.1086/116925.
- ^ 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.