2 Vulpeculae
{{Short description|Star in the constellation Vulpecula}}
{{Starbox begin
| name = 2 Vulpeculae
}}
{{Starbox image
| image = 250px
| caption = A light curve for ES Vulpeculae, adapted from Lynds (1959)
}}
{{Starbox observe 2s
| epoch = J2000.0
| constell = Vulpecula
| component1 = 2 Vul A
| dec1 = {{DEC|+23|01|31.9418}}
| component2 = 2 Vul B
| dec2 = {{DEC|+23|01|30.8604}}
| appmag_v2 =
}}
{{Starbox character
| type =
| u-b =
| variable = β Cep
}}
{{Starbox astrometry
| component1 = 2 Vul A
| prop_mo_ra = {{val|+0.956|0.041}}
| prop_mo_dec = {{val|−6.636|0.087}}
| parallax = 1.8212
| p_error = 0.0880
| component2 = 2 Vul B
| radial_v2 =
| prop_mo_ra2 = {{val|−0.170|0.038}}
| prop_mo_dec2 = {{val|−5.324|0.073}}
| parallax2 = 1.7131
| p_error2 = 0.0757
| absmag_v2 =
}}
{{Starbox detail
| source =
| radius =
| luminosity_bolometric = 21,922
| gravity =
| metal_fe = {{Val|−0.06|0.10}}
}}
{{Starbox catalog
| names = {{odlist | V=ES Vul | F=2 Vul | BD=+22°3648 | HD=180968 | HIP=94827 | HR=7318 | SAO=87036 | WDS=19177+2302 }}
}}
{{Starbox reference
| Simbad = 2+Vul
}}
{{Starbox end}}
2 Vulpeculae is a binary star system in the northern constellation of Vulpecula, located around 1,800 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.43.
2 Vulpeculae is a double-lined spectroscopic binary; as of 2002, the pair had an angular separation of {{Val|1.72|ul=arcsecond}} along a position angle of 127.2°.
The primary component of the binary is a rapidly rotating Be star with a stellar classification of B1 IV. It is a variable star with an amplitude of 0.06 magnitude and a period of 0.6096 days, tentatively classified as Beta Cephei variable. The variability was discovered in 1959, and it has been assigned the variable star designation ES Vulpeculae.
References
{{Reflist|refs=
| last1=Lynds | first1=C. R. | title=The Light-Variability of Early B Giants | journal=Astrophysical Journal
| date=September 1959 | volume=130 | pages=577–598 | doi=10.1086/146747 | bibcode=1959ApJ...130..577L
| url=https://articles.adsabs.harvard.edu/pdf/1959ApJ...130..577L | access-date=11 September 2024}}
{{cite simbad | title=2 Vul | access-date=2019-03-12 }}
| display-authors=1 | last1=Gáspár | first1=András
| last2=Rieke | first2=George H. | last3=Ballering | first3=Nicholas
| title=The Correlation between Metallicity and Debris Disk Mass
| journal=The Astrophysical Journal
| volume=826 | issue=2 | page=171 | year=2016
| bibcode=2016ApJ...826..171G | doi=10.3847/0004-637X/826/2/171 | arxiv=1604.07403 | s2cid=119241004 | doi-access=free }}
| display-authors=1 | last1=Chini | first1=R.
| last2=Hoffmeister | first2=V. H. | last3=Nasseri | first3=A.
| last4=Stahl | first4=O. | last5=Zinnecker | first5=H.
| title=A spectroscopic survey on the multiplicity of high-mass stars
| journal=Monthly Notices of the Royal Astronomical Society
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| doi=10.1111/j.1365-2966.2012.21317.x
| doi-access=free | bibcode=2012MNRAS.424.1925C | arxiv=1205.5238 | s2cid=119120749 }}
| last1=Roberts | first1=Lewis C. Jr.
| title=Astrometric and photometric measurements of binary stars with adaptive optics: observations from 2002
| journal=Monthly Notices of the Royal Astronomical Society
| volume=413 | issue=2 | pages= 1200–1205 | date=May 2011
| doi=10.1111/j.1365-2966.2011.18205.x
| doi-access=free
| bibcode=2011MNRAS.413.1200R | arxiv=1012.3383 | s2cid=118398949
}}
| last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M.
| title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun
| journal=Monthly Notices of the Royal Astronomical Society
| volume=410 | issue=1 | pages=190–200 | date=January 2011
| doi=10.1111/j.1365-2966.2010.17434.x
| doi-access=free | bibcode=2011MNRAS.410..190T | arxiv=1007.4883 | s2cid=118629873 }}
| title=Masses and luminosities of O- and B-type stars and red supergiants
| journal=Astronomische Nachrichten
| display-authors=1 | last1=Hohle | first1= M. M.
| last2=Neuhäuser | first2= R. | last3=Schutz | first3= B. F.
| volume=331 | issue=4 | pages=349–360 | year=2010
| doi=10.1002/asna.200911355 | bibcode=2010AN....331..349H | arxiv=1003.2335 | s2cid=111387483
}}
| display-authors=1 | last1=Abt | first1=Helmut A.
| last2=Levato | first2=Hugo | last3=Grosso | first3=Monica
| title=Rotational Velocities of B Stars
| journal=The Astrophysical Journal
| volume=573 | issue=1 | pages=359–365 | date=July 2002
| doi=10.1086/340590 | bibcode=2002ApJ...573..359A | doi-access=free }}
| 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.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085 | s2cid=125853869 }}
| last1=Rountree | first1=Janet | last2=Sonneborn | first2=George
| title=Criteria for the spectral classification of B stars in the ultraviolet
| journal=Astrophysical Journal
| volume=369 | page=515 | year=1991
| bibcode=1991ApJ...369..515R | doi=10.1086/169781 }}
| title=Tests of the Pulsation and Starspot Models for the Periodic Be-Stars
| last1=Balona | first1=L. A.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=277 | issue=4 | page=1547 | date=December 1995
| doi=10.1093/mnras/277.4.1547 | bibcode=1995MNRAS.277.1547B | doi-access=free }}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters | arxiv=1108.4971
| volume=38 | issue=5 | page=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | s2cid=119257644 }}
{{Cite Gaia DR3|2022245532721403776}}
{{Cite Gaia DR3|2022245532710961920}}
}}
External links
- {{WikiSky}}
{{Sky|19|17|43.6|+|23|01|32|1918.5637}}
{{Stars of Vulpecula}}
{{DEFAULTSORT:2 Vulpeculae}}
Category:Spectroscopic binaries