View source for BAT99-7

{{Short description|Wolf-Rayet star in the constellation Dorado}}
{{Starbox begin|name=BAT99-7}}
{{Starbox observe|epoch=J2000|ra={{RA|04|55|34.3416}}<ref name=dr3/>|dec={{DEC|-67|30|02.683}}<ref name=dr3/>|appmag_v=13.81<ref name=ucac4/>|constell=[[Dorado]]}}
{{Starbox character|type=[[Wolf–Rayet star|Wolf-Rayet]]|class=WN4b<ref name=hainich/>|b-v=−0.35<ref name=2mass/>|u-b=−0.567<ref name=2mass/>|variable=}}
{{Starbox astrometry|radial_v=|prop_mo_ra=1.733<ref name=dr3/>|prop_mo_dec=0.367<ref name=dr3/>|parallax=−0.0083|p_error=0.0166|parallax_footnote=<ref name=dr3/>|dist_pc=50,000|absmag_v=−5.02<ref name=hainich/>}}
{{Starbox detail|mass=25<ref name=hainich/>|radius=1.1<ref name=hainich/>|luminosity=692,000<ref name=hainich/>|temperature=158,500<ref name=hainich/>|metal=|rotational_velocity=160<ref name=shenar/>}}
{{Starbox catalog|names=Brey 6, HD 32109, [[2MASS]]&nbsp;J04553134-6730028}}
{{Starbox reference|Simbad=BAT99+7}}
{{Starbox end}}
'''BAT99-7''' is a WN-type [[Wolf-Rayet star]] located in the [[Large Magellanic Cloud]], in the constellation of [[Dorado]], about 160,000 [[light year]]s away. The star has a [[Astronomical spectroscopy|spectrum]] containing extremely broad [[emission line]]s, and is the prototype for the "round line" stars, Wolf-Rayet stars whose spectra are characterized by strong and broad emission lines with round line profiles. The broad emission lines hint at an extremely high temperature of nearly {{val|160,000|fmt=commas|ul=Kelvin}}, which would make it the hottest of all WN stars with known temperatures, as well as an extraordinarily large mass loss rate for a Wolf-Rayet star in the LMC, at {{solar mass|{{val|e=−4.48}}|link=y}}/yr, which means that every 30,200 years, the star loses 1 solar mass worth of mass.<ref name=hainich/>
== References ==
{{reflist|refs=
<ref name=dr3>{{cite Gaia EDR3|4661671882931385216}}</ref>
<ref name=2mass>{{cite journal |title=VizieR On-line Data Catalog: UCAC4 Catalogue |journal=VizieR On-line Data Catalog: I/322A |volume=1322 |last1=Zacharias |first1=N. |last2=Finch |first2=C. T. |last3=Girard |first3=T. M. |last4=Henden |first4=A. |last5=Bartlett |first5=J. L.|author6-link=Jennifer Bartlett (astronomer) |last6=Monet |first6=D. G. |last7=Zacharias |first7=M. I. |display-authors=5 |date=July 2012 |bibcode=2012yCat.1322....0Z}}</ref>
<ref name=ucac4>{{cite journal|bibcode=2012yCat.1322....0Z |title=VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012) |journal=VizieR On-line Data Catalog: I/322A. Originally Published in: 2012yCat.1322....0Z; 2013AJ....145...44Z |volume=1322 |last1=Zacharias |first1=N. |last2=Finch |first2=C. T. |last3=Girard |first3=T. M. |last4=Henden |first4=A. |last5=Bartlett |first5=J. L.|author5-link=Jennifer Bartlett (astronomer) |last6=Monet |first6=D. G. |last7=Zacharias |first7=M. I. |year=2012 }}</ref>
<ref name="hainich">{{Cite journal | doi = 10.1051/0004-6361/201322696| title = The Wolf-Rayet stars in the Large Magellanic Cloud| journal = Astronomy & Astrophysics| volume = 565| pages = A27| year = 2014| last1 = Hainich | first1 = R.| last2 = Rühling | first2 = U.| last3 = Todt | first3 = H.| last4 = Oskinova | first4 = L. M.| last5 = Liermann | first5 = A.| last6 = Gräfener | first6 = G.| last7 = Foellmi | first7 = C.| last8 = Schnurr | first8 = O.| last9 = Hamann | first9 = W. -R. | arxiv = 1401.5474| bibcode = 2014A&A...565A..27H| s2cid = 55123954}}</ref>
<ref name=shenar>{{Cite journal |last1=Shenar |first1=T. |last2=Hamann |first2=W. -R. |last3=Todt |first3=H. |date=2014-02-01 |title=The impact of rotation on the line profiles of Wolf-Rayet stars |bibcode=2014A&A...562A.118S |journal=Astronomy and Astrophysics |volume=562 |pages=A118 |doi=10.1051/0004-6361/201322496 |arxiv=1401.2159 |s2cid=21732510 |issn=0004-6361}}</ref>}}
{{Stars of Dorado}}
[[Category:Stars in the Large Magellanic Cloud]]
[[Category:Wolf–Rayet stars]]
[[Category:Dorado]]
[[Category:2MASS objects|J04553134-6730028]]
[[Category:Henry Draper Catalogue objects|032109]]
{{star-stub}}