Kappa Cancri
{{Short description|Star in the constellation Cancer}}
{{Starbox begin
| name = Kappa Cancri
}}
{{Starbox image
| image=
{{Location mark
|image= Cancer IAU.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=κ Cnc
|x=340|y=606
}}
| caption = Location of κ Cancri (circled)
}}
{{Starbox image
| image = 250px
| caption = A light curve for Kappa Cancri, plotted from TESS data
}}
{{Starbox observe
| epoch = J2000.0
| constell = Cancer
| dec = {{DEC|+10|40|05.5196}}
}}
{{Starbox character
| u-b =
| r-i =
| variable = α2 CVn
}}
{{Starbox astrometry
| radial_v =
| parallax = 5.3209
| p_error = 0.1298
}}
{{Starbox orbit
| period_unitless = 6.3933 d
| eccentricity = 0.13
| periastron = 2440001.95 JD
| periarg = 157
| k1 = 67.4
}}
{{Starbox detail
| component1 = κ Cnc A
| mass = 4.5
| radius = 5.0
| temperature = {{Val|12800|200|fmt=commas}}
| rotational_velocity = {{Val|6|2}}
| age_myr =
| component2 = κ Cnc B
| mass2 = 2.1
| radius2 = 2.4
| temperature2 = 8,500
| gravity2 = 4.0
| rotational_velocity2 = 40
}}
{{Starbox catalog
| names = {{odlist | B=κ Cnc | F=76 Cancri | FK5=1238 | BD=+11°1984 | HD=78316 | HIP=44798 | HR=3623 | SAO=98378 }}
}}
{{Starbox reference
| Simbad = kap+Cnc
}}
{{starbox end}}
Kappa Cancri, Latinized from κ Cancri, is a blue-white hued binary star system in the zodiac constellation of Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.23. The magnitude difference between the two stars is about 2.6. Based upon an annual parallax shift of 5.3209 mas as seen from the Earth, the system is located roughly 610 light-years from the Sun. The position of this system near the ecliptic means it is subject to lunar occultation.
This is a single-lined spectroscopic binary star system with an orbital period of 6.39 days and an eccentricity of 0.13. The primary, component A, has a stellar classification of B8 IIIp, suggesting it is a B-type giant star. It a mercury-manganese star, a type of chemically peculiar star showing large overabundances of those two elements in the outer atmosphere. It is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies from magnitude +5.22 to +5.27 with a period of five days.
The primary component has 4.5 times the mass of the Sun, five times the Sun's radius, and an effective temperature of {{val|fmt=commas|13,200|ul=K}}. The secondary, component B, is a smaller star with 2.1 times the mass and 2.4 times the radius of the Sun, having an effective temperature of {{val|fmt=commas|8,500|u=K}}.
References
{{reflist|refs=
{{Cite Gaia EDR3|592021045155272832}}
| title=MAST: Barbara A. Mikulski Archive for Space Telescopes
| url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html
| publisher=Space Telescope Science Institute |access-date=5 December 2022}}
| 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=. }}
| title=General catalogue of variable stars: Version GCVS 5.1
| display-authors=1 | last1=Samus' | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| journal=Astronomy Reports | postscript=.
| volume=61 | issue=1 | pages=80–88 | date=January 2017
| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 }}
| title=Discovery of the secondary star of the HgMn binary kappa CANCRI
| display-authors=1 | last1=Ryabchikova | first1=T.
| last2=Kotchoukhov | first2=O. | last3=Galazutdinov | first3=G.
| last4=Musaev | first4=F. | last5=Adelman | first5=S. J.
| journal=Contributions of the Astronomical Observatory Skalnate Pleso
| volume=27 | issue=3 | pages=258–260 | date=April 1998
| bibcode=1998CoSka..27..258R | postscript=. |arxiv = astro-ph/9805143 }}
| last1=Levato | first1=H.
| title=Rotational velocities and spectral types for a sample of binary systems
| journal=Astronomy and Astrophysics
| volume=19 | pages=91 | year=1975
| bibcode=1975A&AS...19...91L | postscript=. }}
| title=SB9: The ninth catalogue of spectroscopic binary orbits
| journal=Astronomy & Astrophysics
| 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.
| volume=424 | issue=2 | pages=727–732 | date=2004
| doi=10.1051/0004-6361:20041213 | bibcode=2004A&A...424..727P
| arxiv=astro-ph/0406573 | s2cid=119387088
| postscript=. }}
| title=A non-LTE spectral analysis of the 3He and 4He isotopes in the HgMn star κ Cancri
| display-authors=1 | last1=Maza | first1=Natalia L.
| last2=Nieva | first2=María-Fernanda | last3=Przybilla | first3=Norbert
| journal=Astronomy & Astrophysics | postscript=.
| volume=572 | id=A112 | pages=7 | date=December 2014
| doi=10.1051/0004-6361/201425037 | bibcode=2014A&A...572A.112M |arxiv = 1412.2052 | s2cid=119116996 }}
| last1=Ryabchikova | first1=T. | postscript=.
| title=Abundance analysis of SB2 binary stars with HgMn primaries
| journal=Contributions of the Astronomical Observatory Skalnate Pleso
| volume=27 | issue=3 | pages=319–323 |date=April 1998
| bibcode=1998CoSka..27..319R | arxiv=astro-ph/9805063 }}
| title=kap Cnc
| access-date=2017-06-19 }}
| title=Identification List of Spectroscopic and Eclipsing Binaries Subject to Occultations by the Moon
| last=Herr | first=Richard B.
| journal=Publications of the Astronomical Society of the Pacific
| volume=81 | issue=479 | page=105 | date=April 1969
| doi=10.1086/128748 | bibcode=1969PASP...81..105H }}
}}
{{Stars of Cancer|state=collapsed}}
{{DEFAULTSORT:Kappa Cancri}}
Category:Alpha2 Canum Venaticorum variables
Category:Mercury-manganese stars
Category:Spectroscopic binaries
Category:Cancer (constellation)