Upsilon Geminorum

{{short description|Evolved red giant star in the constellation Gemini}}{{confuse|U Geminorum}}

{{Starbox begin

| name = υ Geminorum

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Gemini

| ra = {{RA|07|35|55.35001}}

| dec = {{DEC|+26|53|44.6802}}

| appmag_v = 4.04 {{nowrap|(4.04 - 4.08)}}

}}

{{Starbox character

| class = M0 III

| b-v = +1.54

| u-b = +1.96

| r-i =

| variable = suspected

}}

{{Starbox astrometry

| radial_v = {{Val|−21.61|0.19}}

| prop_mo_ra = {{val|-32.841}}

| prop_mo_dec = {{val|-106.002}}

| pm_footnote =

| parallax = 12.8761

| p_error = 0.2288

| parallax_footnote =

| absmag_v = −0.53

}}

{{Starbox detail

| mass = 1.52

| radius = {{val|39.62|0.74|0.76}}

| luminosity = {{val|369.6|18.5}}

| temperature = {{Val|4019|38|fmt=commas}}

| gravity = 1.0

| metal_fe = 0.17

| rotational_velocity = 5.9

| rotation =

| age_gyr = 3.53

}}

{{Starbox catalog

| names = υ Gem, 69 Geminorum, BD+27° 1424, FK5 1196, HD 60522, HIP 36962, HR 2905, SAO 79533.

}}

{{Starbox reference

| Simbad = ups+Gem

}}

Upsilon Geminorum, Latinized from υ Geminorum, is a star in the constellation Gemini. It has an apparent visual magnitude of 4.04, which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.88 mas, it is around 253 light years from the Sun. There is a visual companion: a magnitude 13.20 star located at an angular separation of 55.20″ along a position angle of 40°, as of 2008.

This is an evolved red giant star with a stellar classification of M0 III. It is estimated to have 1.52 times the mass of the Sun, but has expanded to 40 times the Sun's radius. The star is spinning with a projected rotational velocity of 5.9 km/s and is about 3.53 billion years old. Upsilon Geminorum is radiating 370 times the solar luminosity from its outer atmosphere at an effective temperature of 4,019 K.

Based upon the motion of this star through space, Upsilon Geminorum is a member of the Wolf 630 moving group. This is a set of stars centered on Wolf 630 that are moving nearly in parallel and have an age of around {{Val|2.7|0.5}} billion years. They may be former members of a dissolved open cluster.

References

{{reflist|refs=

{{cite journal |bibcode=2021AJ....162..198B |title=Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer |last1=Baines |first1=Ellyn K. |last2=Thomas Armstrong |first2=J. |last3=Clark |first3=James H. |last4=Gorney |first4=Jim |last5=Hutter |first5=Donald J. |last6=Jorgensen |first6=Anders M. |last7=Kyte |first7=Casey |last8=Mozurkewich |first8=David |last9=Nisley |first9=Ishara |last10=Sanborn |first10=Jason |last11=Schmitt |first11=Henrique R. |last12=Van Belle |first12=Gerard T. |journal=The Astronomical Journal |date=2021 |volume=162 |issue=5 |page=198 |doi=10.3847/1538-3881/ac2431 |doi-access=free |arxiv=2211.09030 }}

{{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 | s2cid=119257644 | postscript=. }}

{{citation

| display-authors=1 | last1=Mason | first1=B. D.

| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.

| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.

| title=The Washington Visual Double Star Catalog

| year=2014 | bibcode=2001AJ....122.3466M | doi = 10.1086/323920

| postscript=. | volume=122 | journal=The Astronomical Journal | issue=6 | pages=3466–3471| doi-access=free }}

{{citation

| title=Spectroscopic Abundances and Membership in the Wolf 630 Moving Group

| last1=Bubar | first1=Eric J. | last2=King | first2=Jeremy R.

| journal=The Astronomical Journal | postscript=.

| volume=140 | issue=2 | pages=293–318 | date=August 2010

| doi=10.1088/0004-6256/140/2/293 | bibcode=2010AJ....140..293B |arxiv = 1005.1205 | s2cid=118455341 }}

{{citation

| title=Abundances in the Local Region. I. G and K Giants

| last1=Luck | first1=R. Earle

| journal=The Astronomical Journal

| doi=10.1088/0004-6256/150/3/88 | bibcode=2015AJ....150...88L

| arxiv=1507.01466 | s2cid=118505114 | postscript=. }}

{{citation

| last1=Morgan | first1=W. W. | last2=Keenan | first2=P. C.

| title=Spectral Classification

| journal=Annual Review of Astronomy and Astrophysics

| volume=11 | page=29 | year=1973 | postscript=.

| doi=10.1146/annurev.aa.11.090173.000333 | bibcode=1973ARA&A..11...29M }}

{{citation

| last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W.

| last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey

| title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity

| journal=The Astronomical Journal | postscript=. | display-authors=1

| volume=135 | issue=1 | pages=209–231 | date=January 2008

| doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | doi-access=free }}

{{citation

| last1=Mermilliod | first1=J.-C.

| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)

| journal=Catalogue of Eggen's UBV Data

| year=1986 | publisher=SIMBAD

| bibcode=1986EgUBV........0M | postscript=. }}

{{cite simbad

| title=ups Gem

| access-date=2016-12-08 | postscript=. }}

{{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|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

}}

External links

{{citation

| first1=James B. | last1=Kaler | date=March 2, 2012

| title=Upsilon Geminorum | work=Stars | publisher=University of Illinois

| url=http://stars.astro.illinois.edu/sow/upsgem.html

| access-date=2016-12-08 | postscript=. }}

Category:M-type giants

Category:Gemini (constellation)

Geminorum, Upsilon

Category:Durchmusterung objects

Category:Suspected variables