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Praemonitus (talk | contribs) Data update w/ ref. |
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| p_error = 0.55
| parallax_footnote = <ref name=vanLeeuwen2007/>
| absmag_v = −2.03<ref name=Anderson2012/>
}}
{{Starbox detail
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| temperature = 22,000<ref name=Hohle2010/>
| gravity = {{Val|3.30|0.10}}<ref name=Neiner2005/>
| metal_fe = −0.36<ref name=Anderson2012/>
| rotational_velocity = {{Val|230|24}}<ref name=Becker2015/>
| age_myr = {{Val|17.0|2.8}}<ref name=Tetzlaff2011/>
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}}
{{Starbox end}}
'''Upsilon Cygni''', [[Latinized]] from
This is a [[B-type main sequence star]] with a [[stellar classification]] of B2 Vne.<ref name=murphy1969/> The 'e' suffix indicates this is a [[Be star]], which means it is a rapidly rotating star surrounded by an orbiting gaseous disk. It has a high [[projected rotational velocity]] of about 230 km/s,<ref name=Becker2015/> which accounts for the nebulous appearance of its lines as indicated by the 'n' suffix. The emission region of its disk has a radius of {{Val|0.20|0.04|u=[[Astronomical Unit|AU]]}}.<ref name=rivinius2013/> The star itself is being viewed generally "pole-on", as ascertained by the lack of [[Absorption line|absorption features]] from the disk.<ref name=Peters1979/>
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| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | postscript=. }}</ref>
<ref name=Anderson2012>{{citation
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | postscript=. }}</ref>
<ref name=Tetzlaff2011>{{citation
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