HD 106760

{{Short description|Binary star in the constellation Coma Berenices}} {{Starbox begin | name = HD 106760 }} {{Starbox observe | epoch = J2000 | ra = {{RA|12|16|30.12328}}<ref name=GaiaDR2/> | dec = {{DEC|+33|03|41.4198}}<ref name=GaiaDR2/> | appmag_v = 4.99<ref name=Anderson2012/> | constell = [[Coma Berenices]] }} {{Starbox character | class = K0.5 III–IIIb<ref name=perkins1989/> | b-v = {{Val|1.140|0.002}}<ref name=Anderson2012/> | u-b = }} {{Starbox astrometry | radial_v = {{Val|−40.4|0.3}}<ref name=Anderson2012/> | prop_mo_ra = −41.979<ref name=GaiaDR2/> | prop_mo_dec = −105.115<ref name=GaiaDR2/> | parallax = 10.2417 | p_error = 0.2354 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = 0.06<ref name=Anderson2012/> }} {{Starbox orbit | reference = <ref name=Pourbaix2004/> | period_unitless = {{Convert|1314.3|days|years|order=flip}} | eccentricity = 0.43 | node = 303.6 | periastron = 2441468.5 JD | k1 = 6.5 }} {{Starbox detail | source = <ref name=Maldonado2016/> | mass = {{Val|1.85|0.14}} | radius = {{Val|16.79|0.79}} | luminosity = 112<ref name=Massarotti2008/> | gravity = {{Val|2.48|0.10}} | temperature = {{Val|4581|28|fmt=commas}} | metal_fe = {{Val|−0.12|0.05}} | rotational_velocity = 0.9<ref name=Massarotti2008/> | age_gyr = {{Val|1.57|0.32}} }} {{Starbox catalog | names = {{odlist | BD=+33° 2213 | FK5=2983 | HD=106760 | HIP=59856 | HR=4668 | SAO=62928 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+106760 }} {{Starbox end}}

'''HD 106760''' is a single-lined [[spectroscopic binary]]<ref name=Griffin1984/> [[star]] system in the northern [[constellation]] of [[Coma Berenices]]. It is faintly visible to the naked eye, having an [[apparent visual magnitude]] of 4.99.<ref name=Anderson2012/> The system is located around 318 [[light year]]s away, as determined from its annual [[stellar parallax|parallax shift]] of {{Val|10.2417|ul=mas}}.<ref name=GaiaDR2/> It is moving closer with a heliocentric [[radial velocity]] of −40 km/s, and is expected to come as close as {{Convert|79.31|pc|ly|abbr=on|sigfig=3|disp=out}} in about 772,000 years.<ref name=Anderson2012/>

The variable [[radial velocity]] of HD 106760 was announced by [[William Wallace Campbell|W. W. Campbell]] of [[Lick Observatory]] in 1922, indicating the binary nature of this system. A preliminary orbit was determined by [[Mount Wilson Observatory]] astronomer [[William H. Christie|W. H. Christie]] in 1936, then refined by English astronomer [[Roger Griffin (astronomer)|R. F. Griffin]] in 1984.<ref name=Griffin1984/> The components of this system orbit each other with a [[orbital period|period]] of 3.6 years and an [[orbital eccentricity|eccentricity]] of 0.43.<ref name=Pourbaix2004/>

The visible component has a [[stellar classification]] of K0.5 III–IIIb,<ref name=perkins1989/> indicating it is an [[stellar evolution|evolved]] [[K-type star|K-type]] [[giant star]]. It is around 1.6 billion years old with 1.9 times the [[mass of the Sun]] and has expanded to 17 times the [[Sun's radius]].<ref name=Maldonado2016/> The star is radiating 112<ref name=Massarotti2008/> times the [[Sun's luminosity]] from its enlarged [[photosphere]] at an [[effective temperature]] of 4,581 K.<ref name=Maldonado2016/>

==References== <references> <ref name=SIMBAD>{{cite simbad | title=HD 106760 | access-date=2018-07-13 }}</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 | s2cid=119257644 | postscript=. }}</ref>

<ref name=Maldonado2016>{{citation | title=Evolved stars and the origin of abundance trends in planet hosts | last1=Maldonado | first1=J. | last2=Villaver | first2=E. | journal=Astronomy & Astrophysics | volume=588 | id=A98 | pages=11 | date=April 2016 | doi=10.1051/0004-6361/201527883 | bibcode=2016A&A...588A..98M | arxiv=1602.00835 | s2cid=119212009 | postscript=. }}</ref>

<ref name=Pourbaix2004>{{citation | display-authors=1 | last1=Pourbaix | first1=D. | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H. | last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I. | last6=Levato | first6=H. | last7=Morrell | first7=N. I. | last8=Torres | first8=G. | last9=Udry | first9=S. | year=2004 | pages=727–732 | volume=424 | title=SB9: The Ninth Catalogue of Spectroscopic Binary Orbits | journal=Astronomy & Astrophysics | postscript=. | bibcode=2004A&A...424..727P | doi=10.1051/0004-6361:20041213 | arxiv=astro-ph/0406573| s2cid=119387088 }}</ref>

<ref name=Griffin1984>{{citation | title=Spectroscopic binaries near the North Galactic Pole. X - HR 4668 | last1=Griffin | first1=R. F. | postscript=. | journal=Journal of Astrophysics and Astronomy | volume=5 | date=June 1984 | issue=2 | pages=181−185 | doi=10.1007/BF02714990 | bibcode=1984JApA....5..181G | s2cid=124007568 }}</ref>

<ref name=Massarotti2008>{{citation | display-authors=1 | postscript=. | 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 | volume=135 | issue=1 | pages=209–231 | date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | s2cid=121883397 | doi-access=free }}</ref>

<ref name=perkins1989>{{citation | title=The Perkins catalog of revised MK types for the cooler stars | journal=Astrophysical Journal Supplement Series | last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C. | volume=71 | pages=245 | year=1989 | doi=10.1086/191373 | bibcode=1989ApJS...71..245K }}</ref> </references>

{{DEFAULTSORT:HD 106760}} [[Category:K-type giants]] [[Category:Spectroscopic binaries]] [[Category:Coma Berenices]] [[Category:Durchmusterung objects]] [[Category:Henry Draper Catalogue objects|106760]] [[Category:Hipparcos objects|059856]] [[Category:Bright Star Catalogue objects|4668]]