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2 Vulpeculae

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Star in the constellation Vulpecula
2 Vulpeculae

A light curve for ES Vulpeculae, adapted from Lynds (1959)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
2 Vul A
Right ascension 19 17 43.6354
Declination +23° 01′ 31.9418″
Apparent magnitude (V) 5.43
2 Vul B
Right ascension 19 17 43.7343
Declination +23° 01′ 30.8604″
Characteristics
Spectral type B1 IV
B−V color index 0.020±0.003
Variable type β Cep
Astrometry
2 Vul A
Radial velocity (Rv)+1.0±4.2 km/s
Proper motion (μ) RA: +0.956±0.041 mas/yr
Dec.: −6.636±0.087 mas/yr
Parallax (π)1.8212 ± 0.0880 mas
Distance1,790 ± 90 ly
(550 ± 30 pc)
Absolute magnitude (MV)−2.35
2 Vul B
Proper motion (μ) RA: −0.170±0.038 mas/yr
Dec.: −5.324±0.073 mas/yr
Parallax (π)1.7131 ± 0.0757 mas
Distance1,900 ± 80 ly
(580 ± 30 pc)
Details
Mass12.5±0.6 M☉
Luminosity (bolometric)21,922 L☉
Temperature26,850 K
Metallicity −0.06±0.10 dex
Rotational velocity (v sin i)270 km/s
Age12.6±0.7 Myr
Other designations
2 Vul, ES Vul, BD+22°3648, HD 180968, HIP 94827, HR 7318, SAO 87036, WDS 19177+2302
Database references
SIMBADdata

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 1.72″ 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

  1. Lynds, C. R. (September 1959). "The Light-Variability of Early B Giants". Astrophysical Journal. 130: 577–598. Bibcode:1959ApJ...130..577L. doi:10.1086/146747. Retrieved 11 September 2024.
  2. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  4. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. ^ Rountree, Janet; Sonneborn, George (1991). "Criteria for the spectral classification of B stars in the ultraviolet". Astrophysical Journal. 369: 515. Bibcode:1991ApJ...369..515R. doi:10.1086/169781.
  6. ^ Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  7. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
  8. ^ Hohle, M. M.; et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349–360. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID 111387483.
  9. Gáspár, András; et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal. 826 (2): 171. arXiv:1604.07403. Bibcode:2016ApJ...826..171G. doi:10.3847/0004-637X/826/2/171. S2CID 119241004.
  10. Abt, Helmut A.; et al. (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
  11. "2 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-12.
  12. ^ Chini, R.; et al. (2012). "A spectroscopic survey on the multiplicity of high-mass stars". Monthly Notices of the Royal Astronomical Society. 424 (3): 1925–1929. arXiv:1205.5238. Bibcode:2012MNRAS.424.1925C. doi:10.1111/j.1365-2966.2012.21317.x. S2CID 119120749.
  13. Roberts, Lewis C. Jr. (May 2011). "Astrometric and photometric measurements of binary stars with adaptive optics: observations from 2002". Monthly Notices of the Royal Astronomical Society. 413 (2): 1200–1205. arXiv:1012.3383. Bibcode:2011MNRAS.413.1200R. doi:10.1111/j.1365-2966.2011.18205.x. S2CID 118398949.
  14. Balona, L. A. (December 1995). "Tests of the Pulsation and Starspot Models for the Periodic Be-Stars". Monthly Notices of the Royal Astronomical Society. 277 (4): 1547. Bibcode:1995MNRAS.277.1547B. doi:10.1093/mnras/277.4.1547.
  15. Lynds, C. R. (1959). "The Light-Variability of Early B Giants". The Astrophysical Journal. 130: 577. Bibcode:1959ApJ...130..577L. doi:10.1086/146747.

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