Astronomy:2 Vulpeculae

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Short description: Star in the constellation Vulpecula
2 Vulpeculae
250px
A light curve for ES Vulpeculae, adapted from Lynds (1959)[1]
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000.0      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Vulpecula
2 Vul A
Right ascension  19h 17m 43.6354s[2]
Declination +23° 01′ 31.9418″[2]
Apparent magnitude (V) 5.43[3]
2 Vul B
Right ascension  19h 17m 43.7343s[4]
Declination +23° 01′ 30.8604″[4]
Apparent magnitude (V)
Characteristics
Spectral type B1 IV[5]
B−V color index 0.020±0.003[3]
Variable type β Cep[6]
Astrometry
2 Vul A
Radial velocity (Rv)+1.0±4.2[3] km/s
Proper motion (μ) RA: +0.956±0.041[2] mas/yr
Dec.: −6.636±0.087[2] mas/yr
Parallax (π)1.8212 ± 0.0880[2] mas
Distance1,790 ± 90 ly
(550 ± 30 pc)
Absolute magnitude (MV)−2.35[3]
2 Vul B
Proper motion (μ) RA: −0.170±0.038[4] mas/yr
Dec.: −5.324±0.073[4] mas/yr
Parallax (π)1.7131 ± 0.0757[4] mas
Distance1,900 ± 80 ly
(580 ± 30 pc)
Details
Mass12.5±0.6[7] M☉
Luminosity (bolometric)21,922[8] L☉
Temperature26,850[8] K
Metallicity [Fe/H]−0.06±0.10[9] dex
Rotational velocity (v sin i)270[10] km/s
Age12.6±0.7[7] Myr
Other designations
2 Vul, ES Vul, BD+22°3648, HD 180968, HIP 94827, HR 7318, SAO 87036, WDS 19177+2302[11]
Database references
SIMBADdata

2 Vulpeculae is a binary star[12] system in the northern constellation of Vulpecula, located around 1,800 light years away[2] 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.[3]

2 Vulpeculae is a double-lined spectroscopic binary;[12] as of 2002, the pair had an angular separation of 1.72″ along a position angle of 127.2°.[13]

The primary component of the binary is a rapidly rotating Be star[14] with a stellar classification of B1 IV.[5] 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.[6] The variability was discovered in 1959,[15] and it has been assigned the variable star designation ES Vulpeculae.[6]

References

  1. ↑ Lynds, C. R. (September 1959). "The Light-Variability of Early B Giants". Astrophysical Journal 130: 577–598. doi:10.1086/146747. Bibcode: 1959ApJ...130..577L. https://articles.adsabs.harvard.edu/pdf/1959ApJ...130..577L. Retrieved 11 September 2024. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ 5.0 5.1 Rountree, Janet; Sonneborn, George (1991). "Criteria for the spectral classification of B stars in the ultraviolet". Astrophysical Journal 369: 515. doi:10.1086/169781. Bibcode: 1991ApJ...369..515R. 
  6. ↑ 6.0 6.1 6.2 Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  7. ↑ 7.0 7.1 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. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T. 
  8. ↑ 8.0 8.1 Hohle, M. M. et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten 331 (4): 349–360. doi:10.1002/asna.200911355. Bibcode: 2010AN....331..349H. 
  9. ↑ Gáspár, András et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal 826 (2): 171. doi:10.3847/0004-637X/826/2/171. Bibcode: 2016ApJ...826..171G. 
  10. ↑ Abt, Helmut A. et al. (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal 573 (1): 359–365. doi:10.1086/340590. Bibcode: 2002ApJ...573..359A. 
  11. ↑ "2 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2+Vul. 
  12. ↑ 12.0 12.1 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. doi:10.1111/j.1365-2966.2012.21317.x. Bibcode: 2012MNRAS.424.1925C. 
  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. doi:10.1111/j.1365-2966.2011.18205.x. Bibcode: 2011MNRAS.413.1200R. 
  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. doi:10.1093/mnras/277.4.1547. Bibcode: 1995MNRAS.277.1547B. 
  15. ↑ Lynds, C. R. (1959). "The Light-Variability of Early B Giants". The Astrophysical Journal 130: 577. doi:10.1086/146747. Bibcode: 1959ApJ...130..577L. 

Coordinates: Sky map 19h 17m 43.6s, +23° 01′ 32″



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