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词条 Gamma Chamaeleontis
释义

  1. References

{{Starbox begin
| name = γ Chamaeleontis
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Chamaeleon
| ra = {{RA|10|35|28.10720}}
| dec = {{DEC|−78|36|28.0321}}
| appmag_v = 4.12[3]
}}{{Starbox character
| class = K5 III[4]
| b-v = +1.57[3]
| u-b = +1.94[3]
| r-i =
| variable =
}}{{Starbox astrometry
| radial_v = −22.4[7]
| prop_mo_ra = −37.61
| prop_mo_dec = +11.08
| parallax = 7.81
| p_error = 0.12
| parallax_footnote =
| absmag_v = −1.43[11]
}}{{Starbox detail
| source =
| mass =
| radius = 67[12]
| luminosity = 864[13]
| temperature = 4,035[13]
| gravity =
| metal_fe =
| rotational_velocity =
| rotation =
| age_gyr =
}}{{Starbox catalog
| names = γ Cha, CD−77° 454, FK5 401, HD 92305, HIP 51839, HR 4174, SAO 256731.[15]
}}{{Starbox reference
| Simbad = gam+Cha
}}{{starbox end}}

Gamma Chamaeleontis, Latinized from γ Chamaeleontis, is a solitary[16] star located in the southern circumpolar constellation of Chamaeleon. It can faintly be seen with the naked eye on a dark night, having an apparent visual magnitude of 4.12.[3] Based upon an annual parallax shift of 7.81 mas, it is located around 418 light years from the Sun.

This is an evolved K-type giant star with a stellar classification of K5 III.[4] The measured angular diameter, after correction for limb darkening, is {{Val|4.86|0.05|u=mas}}.[20] At the estimated distance of the star, this yields a physical size of about 67 times the radius of the Sun.[12] It is a suspected variable star, with an amplitude of 0.01 magnitude.[22] The star radiates 864 times the solar luminosity from its outer atmosphere with an effective temperature of 4,053 K.[13]

In the next 7500 years, the south Celestial pole will pass close to this stars (4200 CE).{{citation needed|date=December 2016}}

References

1. ^1 {{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=. }}
2. ^1 {{citation | title=The classification of intrinsic variables. IV. Very-small-amplitude, very-short-period red variables | last1=Eggen | first1=O. J. | postscript=. | journal=Astrophysical Journal | volume=184 | page=793 | year=1973 | doi=10.1086/152371 | bibcode=1973ApJ...184..793E }}
3. ^1 {{citation | display-authors=1 | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | postscript=. | volume=431 | issue=2 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
4. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | postscript=. | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41}} The radius (R*) is given by::
5. ^1 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | postscript=. }}
6. ^1 2 3 {{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | postscript=. }}
7. ^1 {{citation | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | journal=Veröff. Astron. Rechen-Inst. Heidelb | volume=35 | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | display-authors=1 | bibcode=1999VeARI..35....1W | postscript=. }}
8. ^1 2 {{citation | last1=Houk | first1=N. | last2=Cowley | first2=A. P. | title=Catalogue of two-dimensional spectral types for the HD stars | volume=I | year=1975 | journal=University of Michigan | bibcode=1975mcts.book.....H | postscript=. }}
9. ^1 2 3 4 {{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | journal=Catalogue of Eggen's UBV data | publisher=SIMBAD | postscript=. | date=1986 | bibcode=1986EgUBV........0M }}
10. ^1 {{cite simbad | title=gam Cha | accessdate=2016-12-11 | postscript=. }}
[1][2][3][4][5][6][7][8][9][10]
}}{{Stars of Chamaeleon|state=collapsed}}

7 : K-type giants|Chamaeleon (constellation)|Bayer objects|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects
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