OU Geminorum

{{short description|Multiple star system in the constellation Gemini}}

{{Starbox begin

| name = OU Geminorum

}}

{{Starbox image

| image = 250px

| caption = A visual band light curve for OU Geminorum, adapted from Bopp et al. (1981)

}}

{{Starbox observe

| epoch = J2000

| constell = Gemini

| ra = {{RA|06|26|10.2464}}

| dec = {{DEC|+18|45|24.896}}

| appmag_v = 6.768

}}

{{Starbox character

| class = K3Vk

| b-v = 0.972

| u-b = 0.662

| variable = BY Dra

}}

{{Starbox astrometry

| radial_v = {{val|−8.98|0.10}}

| prop_mo_ra = {{val|−124.020|0.097}}

| prop_mo_dec = {{val|−159.335|0.054}}

| parallax = 68.46

| p_error = 0.34

| parallax_footnote =

| absmag_v = {{val|5.93|0.05}}

}}

{{Starbox orbit

| reference =

| primary = OU Gem Aa

| name = OU Gem Ab

| period_unitless = {{val|6.991878|0.000004|u=days}}

| eccentricity = {{val|0.151|0.0024}}

| periastron = {{val|54900.0719|0.0203|u=JD}}

| periarg = {{val|77.63|1.09}}

| k1 = {{val|57.09|0.15}}

| k2 = {{val|66.22|0.28}}

}}

{{Starbox detail

| source =

| component1 = OU Gem Aa

| temperature = 4960

| gravity = 4.55

| radius = 0.81

| mass = 0.85

| component2 = OU Gem Ab

| temperature2 = 4390

| gravity2 = 4.65

| radius2 = 0.65

| mass2 = 0.71

}}

{{Starbox catalog

| names = OU Gem, BD+18 1214, GJ 233, HD 45088, HIP 30630, SAO 95677

}}

{{Starbox reference

| Simbad = OU+Gem

}}

OU Geminorum (OU Gem) is a visual binary or possible triple star located in the constellation of Gemini.

The system has an absolute magnitude of 5.93, so at a distance of 48 light years it has an apparent magnitude of 6.77 when viewed from earth. It also has a total proper motion of 0.210"/yr and belongs to the Ursa Major stream.

The system is a much studied BY Draconis variable star with a period of 6.99 days. The primary star has a spectral type of K3Vk. The secondary star in the system has a surface temperature of {{val|4486|50|ul=K}} and orbits the primary in about seven days.

References

{{reflist|refs=

{{Cite web | url=http://cdsweb.cern.ch/record/411408/files/9912160.pdf | archive-url=https://archive.today/20121209190058/http://cdsweb.cern.ch/record/411408/files/9912160.pdf | url-status=dead | archive-date=2012-12-09 | title=Multiwavelength optical observations of chromospherically active bina…}}

{{Cite web | url=http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00500.htm | title=Aricns 4C00500 | access-date=2011-10-04 | archive-date=2012-09-07 | archive-url=https://web.archive.org/web/20120907202335/http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00500.htm | url-status=dead }}

{{cite journal|title=Nearby stars of the Galactic disc and halo - IV|author=Fuhrmann, Klaus|journal=Monthly Notices of the Royal Astronomical Society|volume=384|issue=1|pages=173–224|date=2008|bibcode=2008MNRAS.384..173F|doi=10.1111/j.1365-2966.2007.12671.x|doi-access=free}}

{{cite journal |last1=Bopp |first1=B. W. |last2=Noah |first2=P. |last3=Klimke |first3=A. |last4=Hall |first4=D. S. |last5=Henry |first5=G. W. |title=Photometry of HD 45088 : a new bright BY DRA variable |journal=Publications of the Astronomical Society of the Pacific |date=August 1981 |volume=93 |pages=504–506 |doi=10.1086/130867 |bibcode=1981PASP...93..504B |s2cid=122130492 |doi-access=free }}

{{cite journal

| display-authors=1

| last1=Koen | first1=C.

| last2=Kilkenny | first2=D.

| last3=van Wyk | first3=F.

| last4=Marang | first4=F.

| title=UBV(RI)_C JHK observations of Hipparcos-selected nearby stars

| journal=Monthly Notices of the Royal Astronomical Society

| volume= 403 | issue=4 | pages=1949–1968 |date=April 2010

| doi=10.1111/j.1365-2966.2009.16182.x | bibcode=2010MNRAS.403.1949K

| doi-access=free}}

{{cite simbad

| title=V* OU Gem

}}

{{cite journal | title=HD 45088 as a BY Draconis variable | last1=Bopp | first1=B. W. | journal=Publications of the Astronomical Society of the Pacific | volume=92 | pages=218–220 | year=1980 | bibcode=1980PASP...92..218B | doi=10.1086/130651 | s2cid=119915971 | doi-access=free }}

{{cite journal | title=Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties | last1=Brown | first1=A. G. A. | last2=Vallenari | first2=A. | last3=Prusti | first3=T. | last4=De Bruijne | first4=J. H. J. | last5=Mignard | first5=F. | last6=Drimmel | first6=R. | last7=Babusiaux | first7=C. | last8=Bailer-Jones | first8=C. A. L. | last9=Bastian | first9=U. | last10=Biermann | first10=M. | last11=Evans | first11=D. W. | last12=Eyer | first12=L. | last13=Jansen | first13=F. | last14=Jordi | first14=C. | last15=Katz | first15=D. | last16=Klioner | first16=S. A. | last17=Lammers | first17=U. | last18=Lindegren | first18=L. | last19=Luri | first19=X. | last20=o'Mullane | first20=W. | last21=Panem | first21=C. | last22=Pourbaix | first22=D. | last23=Randich | first23=S. | last24=Sartoretti | first24=P. | last25=Siddiqui | first25=H. I. | last26=Soubiran | first26=C. | last27=Valette | first27=V. | last28=Van Leeuwen | first28=F. | last29=Walton | first29=N. A. | last30=Aerts | first30=C. | display-authors=1 | journal=Astronomy and Astrophysics | volume=595 | at=A2 | year=2016 | arxiv=1609.04172 | bibcode=2016A&A...595A...2G | doi=10.1051/0004-6361/201629512 | hdl=2445/125903 | s2cid=1828208 }}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/337/tgas&recno=965755 Gaia Data Release 1 catalog entry]

{{cite journal | title=Absolute parameters and chemical composition of the binary star OU Gem | last1=Glazunova | first1=L. V. | last2=Mishenina | first2=T. V. | last3=Soubiran | first3=C. | last4=Kovtyukh | first4=V. V. | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society | volume=444 | issue=2 | pages=1901–1908 | year=2014 | bibcode=2014MNRAS.444.1901G | doi=10.1093/mnras/stu1576 | doi-access=free }}

}}