View source for Astronomy:Gliese 908

{{short description|Star in the constellation Pisces}}
{{Sky|23|49|12.52790|+|02|24|04.4072|19.275}}
{{Starbox begin}}
{{Starbox image
| image = [[Image:BRPscLightCurve.png|320px]]
| caption = A [[Astronomy:Photometric system#Photometric letters|visual band]] [[Astronomy:Light curve|light curve]] for BR Piscium, plotted from ''[[Astronomy:All Sky Automated Survey for SuperNovae|ASAS-SN]]'' data<ref name="ASAS-SN"/>
}}
{{Starbox observe
| epoch = [[Astronomy:J2000|J2000]]
| constell = [[Astronomy:Pisces (constellation)|Pisces]]
| ra = {{RA|23|49|12.52790}}{{r|van Leeuwen2007}}
| dec = {{DEC|02|24|04.4072}}{{r|van Leeuwen2007}}
| appmag_v = 8.93 - 9.03<ref name=gcvs/>
}}
{{Starbox character
| class =  M1V Fe-1<ref name=perkins/>
| variable = [[Astronomy:BY Draconis variable|BY Dra]]<ref name=gcvs/> 
}}
{{Starbox astrometry 
| radial_v = {{val|-71.79}}<ref name=dr2/>
| prop_mo_ra = {{val|992.665}}<ref name=dr2/>
| prop_mo_dec = {{val|-968.648}}<ref name=dr2/>
| parallax = 169.2163
| p_error = 0.0281
| parallax_footnote = <ref name="GaiaEDR3">{{Cite Gaia EDR3|2739689239311660672}}</ref>
| absmag_v = +10.1<ref name=borosaikia/>
}}
{{Starbox detail
| mass = 0.37<ref name=hades/>
| radius = 0.39<ref name=maldonado/>
| luminosity_bolometric = 0.022<ref name=maldonado/>
| gravity = 4.86<ref name=maldonado/>
| temperature = 3,570<ref name=maldonado/>
| metal_fe = {{val|−0.51|0.05}}<ref name="Lindgren2017"/>
| rotational_velocity = 2.25<ref name=houdebine/>
| age_gyr = 
}}

{{Starbox catalog|names={{Odlist
|BD=+01°4774
|V=BR Piscium
|G=29-68
|G2=31-6
|GJ=908<ref name="Gliese1991">{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=V/70A&Name=Gl%20908|title=Gl 908|work=Preliminary Version of the Third Catalogue of Nearby Stars|author1=Gliese, W.  |author2=Jahreiß, H.|year=1991}}</ref>
|SAO=128397
|LTT=17014
|LHS=550<ref name="Luyten1979 LHS">{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/87B&LHS=550|title=LHS 550|work=LHS Catalogue, 2nd Edition|author=Luyten, Willem Jacob|year=1979}}</ref>
|PPM=174453
|IRAS=23466+0207
|GSC=00586-00610
|PLX=5763<ref name="van Altena1995">{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/238A/picat&GCTP=5763|title=GCTP 5763|work=The General Catalogue of Trigonometric Stellar Parallaxes |edition=Fourth |author1=Van Altena W. F. |author2=Lee J. T. |author3=Hoffleit E. D. |year=1995}}</ref>
|HIP=117473<ref name="van Leeuwen2007">{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/hip_main&HIP=117473|title=HIP 117473|work=The Hipparcos and Tycho Catalogues|author=Perryman|year=1997|display-authors=0}}</ref>
|TYC=586-610-1<ref name="Perryman1997_tyc">{{cite web|url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-source=I/239/tyc_main&HIP=117473|title=HIP 117473|work=The Hipparcos and Tycho Catalogues|author=Perryman|year=1997|display-authors=0}}</ref>
|2MASS=J23491255+0224037
}}, Lalande 46650}}
{{Starbox reference
|Simbad=BR+Psc
}}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Pisces_constellation_map.svg
|alt=Gliese 908 is located in the constellation Pisces
|caption=Location of Gliese 908 in the constellation [[Astronomy:Pisces (constellation)|Pisces]]|border=infobox|mark=Red_pog.png|width=320
|label=Gliese 908
|position=left
|lat=28.9
|long=68.9
}}|caption=
}}
{{Starbox end}}

'''Gliese 908''' is a [[Astronomy:Red dwarf|red dwarf]] star, located in constellation [[Astronomy:Pisces (constellation)|Pisces]] at 19.3 [[Astronomy:Light-year|light-year]]s from Earth.  It is a [[Astronomy:BY Draconis variable|BY Draconis variable]] star with a [[Astronomy:Variable star designation|variable star designation]] of '''BR Piscium'''.  Its apparent magnitude varies between magnitude 8.93 and magnitude 9.03 as a result of [[Astronomy:Starspot|starspot]]s and varying [[Astronomy:Chromosphere|chromospheric]] activity.

The variability of Gliese 908 was confirmed in 1994, although no period could be detected in its brightness changes.<ref name=weis/>  It was entered into the [[Astronomy:General Catalogue of Variable Stars|General Catalogue of Variable Stars]] in 1997.<ref name=ibvs/>

Gliese 908 is a cool [[Astronomy:Main sequence|main sequence]] star, a red dwarf, with a [[Astronomy:Stellar classification|spectral class]] of M1V Fe-1.  The suffix indicates a noticeable deficiency in heavy elements.<ref name=perkins/>

==References==
{{reflist|refs=

<ref name="ASAS-SN">{{cite web |url=https://asas-sn.osu.edu/variables/lookup |website=ASAS-SN Variable Stars Database|title=ASAS-SN Variable Stars Database|publisher=ASAS-SN |access-date=6 January 2022}}</ref>

<ref name="Lindgren2017">{{cite journal | title=Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature | last1=Lindgren | first1=Sara | last2=Heiter | first2=Ulrike | journal=Astronomy and Astrophysics | volume=604 | pages=A97 | year=2017 | arxiv=1705.08785 | bibcode=2017A&A...604A..97L | doi=10.1051/0004-6361/201730715 | s2cid=119216828 }}</ref>

<ref name=perkins>{{cite journal|bibcode=1989ApJS...71..245K|title=The Perkins Catalog of Revised MK Types for the Cooler Stars|journal=The Astrophysical Journal Supplement Series|volume=71|pages=245|last1=Keenan|first1=Philip C.|last2=McNeil|first2=Raymond C.|year=1989|doi=10.1086/191373}}</ref>

<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/gcvs|display-authors=0|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>

<ref name=dr2>{{cite DR2|2739689239311660672}}</ref>

<ref name=borosaikia>{{citation
 | last1=Boro Saikia |first1=S. |last2=Marvin |first2=C. J.
 | last3=Jeffers |first3=S. V. |last4=Reiners |first4=Ansgar
 | last5=Cameron |first5=R. |last6=Marsden |first6=S. C.
 | last7=Petit |first7=P. |last8=Warnecke |first8=J.
 | last9=Yadav |first9=A. P. |last10=Teske |first10=J. K. 
 | last11=Shectman |first11=S. A. |last12=Crane |first12=J. D.
 | last13=Thompson |first13=I. |last14=Keiser |first14=S.
 | last15=Jenkins |first15=J. S. |last16=Berdiñas |first16=Z.
 | last17=Diaz |first17=M. |last18=Kiraga |first18=M.
 | last19=Barnes |first19=J. R. |display-authors=1
 | title=Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles
 | journal=Astronomy and Astrophysics
 | volume=616 | pages=A108 | year=2018
 | bibcode=2018A&A...616A.108B | arxiv=1803.11123
 | doi=10.1051/0004-6361/201629518 | s2cid=118915212 | postscript=. }}</ref>

<ref name=hades>{{cite journal|bibcode=2017A&A...598A..26P|title=HADES RV Programme with HARPS-N at TNG. II. Data treatment and simulations|journal=Astronomy and Astrophysics|volume=598|pages=A26|last1=Perger|first1=M.|last2=García-Piquer|first2=A.|last3=Ribas|first3=I.|last4=Morales|first4=J. C.|last5=Affer|first5=L.|last6=Micela|first6=G.|last7=Damasso|first7=M.|last8=Suárez-Mascareño|first8=A.|last9=González-Hernández|first9=J. I.|last10=Rebolo|first10=R.|last11=Herrero|first11=E.|last12=Rosich|first12=A.|last13=Lafarga|first13=M.|last14=Bignamini|first14=A.|last15=Sozzetti|first15=A.|last16=Claudi|first16=R.|last17=Cosentino|first17=R.|last18=Molinari|first18=E.|last19=Maldonado|first19=J.|last20=Maggio|first20=A.|last21=Lanza|first21=A. F.|last22=Poretti|first22=E.|last23=Pagano|first23=I.|last24=Desidera|first24=S.|last25=Gratton|first25=R.|last26=Piotto|first26=G.|last27=Bonomo|first27=A. S.|last28=Martinez Fiorenzano|first28=A. F.|last29=Giacobbe|first29=P.|last30=Malavolta|first30=L.|display-authors=29|year=2017|arxiv=1610.08698|doi=10.1051/0004-6361/201628985|s2cid=56341358}}</ref>

<ref name=houdebine>{{cite journal|bibcode=2010MNRAS.407.1657H|title=Observation and modelling of main-sequence star chromospheres - XIV. Rotation of dM1 stars|journal=Monthly Notices of the Royal Astronomical Society|volume=407|issue=3|pages=1657–1673|last1=Houdebine|first1=E. R.|year=2010|doi=10.1111/j.1365-2966.2010.16827.x|doi-access=free}}</ref>

<ref name=maldonado>{{cite journal|bibcode=2015A&A...577A.132M|title=Stellar parameters of early-M dwarfs from ratios of spectral features at optical wavelengths|journal=Astronomy and Astrophysics|volume=577|pages=A132|last1=Maldonado|first1=J.|last2=Affer|first2=L.|last3=Micela|first3=G.|last4=Scandariato|first4=G.|last5=Damasso|first5=M.|last6=Stelzer|first6=B.|last7=Barbieri|first7=M.|last8=Bedin|first8=L. R.|last9=Biazzo|first9=K.|last10=Bignamini|first10=A.|last11=Borsa|first11=F.|last12=Claudi|first12=R. U.|last13=Covino|first13=E.|last14=Desidera|first14=S.|last15=Esposito|first15=M.|last16=Gratton|first16=R.|last17=González Hernández|first17=J. I.|last18=Lanza|first18=A. F.|last19=Maggio|first19=A.|last20=Molinari|first20=E.|last21=Pagano|first21=I.|last22=Perger|first22=M.|last23=Pillitteri|first23=I.|last24=Piotto|first24=G.|last25=Poretti|first25=E.|last26=Prisinzano|first26=L.|last27=Rebolo|first27=R.|last28=Ribas|first28=I.|last29=Shkolnik|first29=E.|last30=Southworth|first30=J.|display-authors=29|year=2015|arxiv=1503.03010|doi=10.1051/0004-6361/201525797|s2cid=53582613}}</ref>

<ref name=weis>{{cite journal|bibcode=1994AJ....107.1135W|title=Long Term Variability in Dwarf M Stars|journal=The Astronomical Journal|volume=107|pages=1135|last1=Weis|first1=Edward W.|year=1994|doi=10.1086/116925}}</ref>

<ref name=ibvs>{{cite journal|bibcode=1997IBVS.4471....1K|title=The 73rd Name-List of Variable Stars|journal=Information Bulletin on Variable Stars|volume=4471|pages=1|last1=Kazarovets|first1=E. V.|last2=Samus|first2=N. N.|year=1997}}</ref>
}}

{{Nearest star systems|4}}
{{Stars of Pisces}}

{{DEFAULTSORT:Gliese 908}}
[[Category:Pisces (constellation)]]
[[Category:M-type main-sequence stars]]
[[Category:Gliese and GJ objects|0908]]
[[Category:Objects with variable star designations|Piscium, BR]]
[[Category:Hipparcos objects|117473]]
[[Category:2MASS objects|J23491255+0224037]]
[[Category:Durchmusterung objects|BD+01 4774]]

{{Sourceattribution|Gliese 908}}