Template:3 k1 polytopes: Difference between revisions

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{{Starbox begin
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| name = Zeta Equulei
}}
{{Starbox image
| image =
    <div style="position: relative">[[File:Equuleus IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Equuleus  constellation and its surroundings]]
    <div style="position: absolute; left: 55.7%; top: 50.5%;">[[File:Cercle rouge 100%.svg|12px]]</div>
    </div>
| caption = The location of ζ Equulei (circled)
}}
{{Starbox observe
| epoch      = J2000
| ra          = {{RA|21|04|34.65147}}<ref name=aaa474_2_653/>
| dec        = {{DEC|+5|30|10.3032}}<ref name=aaa474_2_653/>
| appmag_v    = 5.593<ref name=saaoc8_59/>
| constell    = [[Equuleus]]
}}
{{Starbox character
| class      = K5&nbsp;III<ref name=mnras389_2_869/>
| b-v        = +1.651<ref name=saaoc8_59/>
| u-b        = +1.934<ref name=saaoc8_59/>
| variable    =
}}
{{Starbox astrometry
| radial_v    = {{nowrap|–15.26 ± 0.2}}<ref name=aaa430_165/>
| prop_mo_ra  = +13.15<ref name=aaa474_2_653/>
| prop_mo_dec = +0.66<ref name=aaa474_2_653/>
| parallax    = 4.24
| p_error    = 0.42
| parallax_footnote = <ref name=aaa474_2_653/>
| absmag_v    = –1.02<ref name=pasp121_882/>
}}
{{Starbox detail
| mass        =
| radius      = 63<ref name=lang2006/>
| luminosity  = 949<ref name=apj22130_1_201/>
| temperature = 3,893<ref name=aaa515_A11/>
| metal_fe    =
| gravity    =
| rotational_velocity = 4.6<ref name=apj22130_1_201/>
| age_gyr    =
}}
{{Starbox catalog
| names = [[Bayer designation|ζ Equulei]], [[Bayer designation|ζ Equ]], [[Bayer designation|Zeta Equulei]], [[Bayer designation|Zeta Equ]], [[Flamsteed designation|3 Equulei]], [[Flamsteed designation|3 Equ]], [[Henry Draper Catalogue|HD]] 200644, [[Hipparcos catalogue|HIP]] 104031, [[Bright Star Catalogue|HR]] 8066, [[Star catalogue#SAO|SAO]] 126518.<ref name=SIMBAD/>
}}
{{Starbox end}}
'''Zeta Equulei''' ('''3 Equulei''') is a single<ref name=mnras389_2_869/> [[star]] located in the small northern [[constellation]] of [[Equuleus]]. It is faintly visible to the naked eye at an [[apparent visual magnitude]] of 5.6.<ref name=saaoc8_59/> Based upon an annual [[parallax]] shift of 4.24&nbsp;[[milliarcsecond|mas]],<ref name=aaa474_2_653/> Zeta Equulei is roughly {{Convert|770|ly|pc|abbr=off|lk=on}} distant from Earth, give or take an 80&nbsp;light-year [[margin of error]]. At that distance, the apparent brightness of the star is diminished by 0.15 in visual magnitude because of [[Extinction (astronomy)|extinction]] from [[interstellar medium|interstellar gas and dust]].<ref name=aaa430_165/>
 
== Properties ==
Zeta Equulei is an [[stellar evolution|evolved]] [[giant star]] with a [[stellar classification]] of K5&nbsp;III.<ref name=mnras389_2_869/> The measured [[angular diameter]] of this star, after correction for [[limb darkening]], is {{nowrap|2.44 ± 0.03 [[milliarcsecond|mas]]}}.<ref name=aaa431_773/> At the estimated distance of Delta Ophiuchi,<ref name=aaa474_2_653/> this yields a physical size of about 63 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> It is radiating an estimated 949<ref name=apj22130_1_201/> times the luminosity of the Sun from this expanded [[stellar atmosphere|outer envelope]] at an [[effective temperature]] of 3,893&nbsp;K.<ref name=aaa515_A11/> At this heat, it shines with the orange-hued glow of a [[K-type star]].<ref name=csiro/>
 
== See also ==
* [[List of stars in Equuleus]]
 
==References==
{{reflist|refs=
 
<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. |arxiv = 0708.1752 }}</ref>
 
<ref name=aaa430_165>{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | postscript=. }}</ref>
 
<ref name=saaoc8_59>{{citation | last1=Cousins | first1=A. W. J. | title=Standardization of Broadband Photometry of Equatorial Standards | journal=South African Astronomical Observatory Circulars | volume=8 | page=59 | year=1984 | bibcode=1984SAAOC...8...59C | postscript=. }}</ref>
 
<ref name=aaa515_A11>{{citation | display-authors=1 | last1=Soubiran | first1=C. | last1=Le Campion | first1=J.-F. | last1=Cayrel de Strobel | first1=G. | last1=Caillo | first1=A. | title=The PASTEL catalogue of stellar parameters | journal=Astronomy and Astrophysics | volume=515 | page=A111 |date=June 2010 | doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S | postscript=. |arxiv = 1004.1069 }}</ref>
 
<ref name=mnras389_2_869>{{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 | postscript=. |arxiv = 0806.2878 }}</ref>
 
<ref name=SIMBAD>{{citation | title=3 Equ -- Star in double system | work=SIMBAD Astronomical Object Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+200644 | accessdate=2012-07-28 | postscript=. }}</ref>
 
<ref name=aaa431_773>{{citation | last1=Richichi | pages=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}</ref>
 
<ref name=lang2006>{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3 | publisher=Birkhäuser | year=2006 | isbn=3-540-29692-1 | url=http://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R<sub>*</sub>) is given by:
:<math>\begin{align} 2\cdot R_*
& = \frac{(240\cdot 2.44\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
& \approx 126\cdot R_{\bigodot}
\end{align}</math></ref>
 
<ref name=pasp121_882>{{citation | last1=Ryon | first1=Jenna | last2=Shetrone | first2=Matthew D. | last3=Smith | first3=Graeme H. | title=Comparing the Ca ii H and K Emission Lines in Red Giant Stars | journal=Publications of the Astronomical Society of the Pacific | volume=121 | issue=882 | pages=842–856 |date=August 2009 | doi=10.1086/605456 | bibcode=2009PASP..121..842R | postscript=. |arxiv = 0907.3346 }}</ref>
 
<ref name=csiro>{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-07-21 | postscript=. }}</ref>
 
<ref name=apj22130_1_201>{{citation | display-authors=1 | last1=Henry | first1=Gregory W. | last2=Fekel | first2=Francis C. | last3=Henry | first3=Stephen M. | last4=Hall | first4=Douglas S. | title=Photometric Variability in a Sample of 187 G and K Giants | journal=The Astrophysical Journal Supplement Series | volume=130 | issue=1 | pages=201–225 |date=September 2000 | doi=10.1086/317346 | bibcode=2000ApJS..130..201H | postscript=. }}</ref>
 
}}
 
==External links==
*http://frostydrew.org/stars.dc/star/id-126518/pss-obsy/
 
{{Stars of Equuleus}}
 
<!-- location -->
[[Category:Equuleus]]
<!-- types -->
[[Category:K-type giants]]
<!-- catalogues -->
[[Category:Bayer objects|Equulei, Zeta]]
[[Category:Flamsteed objects|Equulei, 3]]
[[Category:Henry Draper Catalogue objects|200644]]
[[Category:HR objects|8066]]

Latest revision as of 04:05, 21 December 2014

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