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{{Short description|K-type giant star in the constellation Equuleus}}
{{Starbox begin
{{Starbox begin
| name = Zeta Equulei
| name = 3 Equulei
}}
}}
{{Starbox image
{{Starbox image
| image =
| image=
{{Location mark
<div style="position: relative">[[File:Equuleus IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Equuleus constellation and its surroundings]]
|image=Equuleus constellation map.svg|alt=|float=center|width=240
<div style="position: absolute; left: 55.7%; top: 50.5%;">[[File:Cercle rouge 100%.svg|12px]]</div>
|label=|position=right
</div>
|mark=Red circle.svg|mark_width=10|mark_link=3 Equulei
⚫
| caption = The location of ζ Equulei (circled)
|x=594|y=690
}}
⚫
|caption=Location of 3 Equulei (circled)
}}
}}
{{Starbox observe
{{Starbox observe
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}}
}}
{{Starbox catalog
{{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/>
| names = [[Bayer designation|ζ Equ]], [[Flamsteed designation|3 Equ]], [[Durchmusterung|BD]]+04° 4606, [[Henry Draper Catalogue|HD]] 200644, [[Hipparcos catalogue|HIP]] 104031, [[Bright Star Catalogue|HR]] 8066, [[Star catalogue#SAO|SAO]] 126518.<ref name=SIMBAD/>
}}
}}
{{Starbox reference
| Simbad = 3+Equ
}}
{{Starbox end}}
{{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/>
'''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/> 3 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/>


3 Equulei has been referred to in some sources as '''ζ (Zeta) Equulei''', although it was not given that [[Bayer designation|designation]] by Bayer.<ref name=hr/>
== Properties ==
⚫
Zeta Equulei is a [[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 ==
== Properties ==
⚫
3 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 770 light-years,<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/>
* [[List of stars in Equuleus]]


==References==
==References==
{{reflist|refs=
{{reflist|refs=


<ref name=hr>{{cite journal | bibcode=1995yCat.5050....0H | title=VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) | journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H | volume=5050 | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H. | year=1995 }}</ref>
<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen | year=2007 | month=November | 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=. }}</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 | year=2005 | month=January | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | postscript=. }}</ref>
<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 | s2cid=18759600 }}</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 | s2cid=17804304 | 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=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 | month=June | year=2010 | doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S | postscript=. }}</ref>
<ref name=aaa515_A11>{{citation | last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F. | last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=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 | s2cid=118362423 }}</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 | month=September | year=2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | postscript=. }}</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 | doi-access=free | bibcode=2008MNRAS.389..869E | postscript=. |arxiv = 0806.2878 | s2cid=14878976 }}</ref>


<ref name=SIMBAD>{{cite simbad | title=* 3 Equ}}</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 | month=February | year=2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}</ref>
<ref name=aaa431_773>{{citation | 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 | volume=431 | pages=773–777 |date=February 2005 | issue=2 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | doi-access=free }}</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:
<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=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R<sub>*</sub>) is given by:
:<math>\begin{align} 2\cdot R_*
:<math>\begin{align} 2\cdot R_*
& = \frac{(240\cdot 2.44\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
& = \frac{(240\cdot 2.44\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
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\end{align}</math></ref>
\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 | month=August | year=2009 | doi=10.1086/605456 | bibcode=2009PASP..121..842R | postscript=. }}</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 | s2cid=17821279 }}</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=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 | access-date=2012-07-21 | postscript=. | archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | archive-date=March 18, 2012 | url-status=dead }}</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 | month=September | year=2000 | doi=10.1086/317346 | bibcode=2000ApJS..130..201H | 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=. | citeseerx=10.1.1.40.8526 | s2cid=17160805 }}</ref>


}}
}}
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<!-- location -->
<!-- location -->

{{DEFAULTSORT:3 Equulei}}
[[Category:Equuleus]]
[[Category:Equuleus]]
<!-- types -->
<!-- types -->
[[Category:K-type stars]]
[[Category:K-type giants]]
[[Category:Giant stars]]
<!-- catalogues -->
<!-- catalogues -->
[[Category:Bayer objects|Equulei, Zeta]]
[[Category:Bayer objects|Equulei, Zeta]]
[[Category:Flamsteed objects|Equulei, 3]]
[[Category:Flamsteed objects|Equulei, 03]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|200644]]
[[Category:Henry Draper Catalogue objects|200644]]
[[Category:HR objects|8066]]
[[Category:Bright Star Catalogue objects|8066]]
[[Category:Hipparcos objects|104031]]

Latest revision as of 12:16, 22 August 2024

3 Equulei
Location of 3 Equulei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus
Right ascension 21h 04m 34.65147s[1]
Declination +5° 30′ 10.3032″[1]
Apparent magnitude (V) 5.593[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.934[2]
B−V color index +1.651[2]
Astrometry
Radial velocity (Rv)–15.26 ± 0.2[4] km/s
Proper motion (μ) RA: +13.15[1] mas/yr
Dec.: +0.66[1] mas/yr
Parallax (π)4.24 ± 0.42 mas[1]
Distance770 ± 80 ly
(240 ± 20 pc)
Absolute magnitude (MV)–1.02[5]
Details
Radius63[6] R☉
Luminosity949[7] L☉
Temperature3,893[8] K
Rotational velocity (v sin i)4.6[7] km/s
Other designations
ζ Equ, 3 Equ, BD+04° 4606, HD 200644, HIP 104031, HR 8066, SAO 126518.[9]
Database references
SIMBADdata

3 Equulei is a single[3] 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.[2] Based upon an annual parallax shift of 4.24 mas,[1] 3 Equulei is roughly 770 light-years (240 parsecs) distant from Earth, give or take an 80 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 from interstellar gas and dust.[4]

3 Equulei has been referred to in some sources as ζ (Zeta) Equulei, although it was not given that designation by Bayer.[10]

Properties

[edit]

3 Equulei is an evolved giant star with a stellar classification of K5 III.[3] The measured angular diameter of this star, after correction for limb darkening, is 2.44 ± 0.03 mas.[11] At the estimated distance of 770 light-years,[1] this yields a physical size of about 63 times the radius of the Sun.[6] It is radiating an estimated 949[7] times the luminosity of the Sun from this expanded outer envelope at an effective temperature of 3,893 K.[8] At this heat, it shines with the orange-hued glow of a K-type star.[12]

References

[edit]
  1. ^ a b c d e f g van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars, 8: 59, Bibcode:1984SAAOC...8...59C.
  3. ^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  4. ^ a b Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
  5. ^ Ryon, Jenna; Shetrone, Matthew D.; Smith, Graeme H. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific, 121 (882): 842–856, arXiv:0907.3346, Bibcode:2009PASP..121..842R, doi:10.1086/605456, S2CID 17821279.
  6. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  7. ^ a b c Henry, Gregory W.; et al. (September 2000), "Photometric Variability in a Sample of 187 G and K Giants", The Astrophysical Journal Supplement Series, 130 (1): 201–225, Bibcode:2000ApJS..130..201H, CiteSeerX 10.1.1.40.8526, doi:10.1086/317346, S2CID 17160805.
  8. ^ a b Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
  9. ^ "* 3 Equ". SIMBAD. Centre de données astronomiques de Strasbourg.
  10. ^ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  11. ^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
  12. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-07-21.
[edit]
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