Astronomy:1 Vulpeculae

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Short description: Star in the constellation Vulpecula
1 Vulpeculae
Vulpecula constellation map.svg
Red circle.svg
Location of 1 Vulpeculae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Vulpecula
Right ascension  19h 16m 13.0392s[1]
Declination 21° 23′ 25.544″[1]
Apparent magnitude (V) 4.77[2]
Characteristics
Spectral type B4IV[3]
U−B color index -0.54[2]
B−V color index -0.05[2]
Astrometry
Radial velocity (Rv)−17.00[4] km/s
Proper motion (μ) RA: −0.383±0.141[1] mas/yr
Dec.: −5.809±0.152[1] mas/yr
Parallax (π)4.2065 ± 0.1557[1] mas
Distance780 ± 30 ly
(238 ± 9 pc)
Absolute magnitude (MV)-2.20[3]
Details
Mass6.9[5] M☉
Luminosity919[3] L☉
Surface gravity (log g)3.74[6] cgs
Temperature16,787[6] K
Metallicity [Fe/H]0.00[6] dex
Rotational velocity (v sin i)80[7] km/s
Other designations
CCDM J19162+2123A, BD+21 3713, FK5 3540, GC 26569, GSC 01611-02043, 2MASS J19161302+2123257, HIP 94703, HR 7306, HD 180554, SAO 87010, WDS J19162+2123A
Database references
SIMBADdata

1 Vulpeculae is a class B4IV[3] (blue subgiant) star in the constellation Vulpecula. Its apparent magnitude is 4.77[2] and it is approximately 780 light years away based on parallax.[1]

The primary was discovered to be a spectroscopic binary in 1978 with a period around 250 days although the orbital elements are described as marginal.[8] There are also companions B, with magnitude 11.6 and separation 39.1", and C, with magnitude 12.8 and separation 43.6".[9][10]

Component A is also a suspected variable star, reported to vary from 4.57 to 4.77 in magnitude.[11] It was reported as possibly variable in 1952 during a search for β CMa variables,[12] but has not been seen to vary since. It was listed as one of the least variable stars based on Hipparcos photometry.[13]

On 29 May 1983, 1 Vulpeculae was occulted by the asteroid Pallas. This event was observed at 130 locations in the United States and Mexico and was the best observed of all asteroid occultation events.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D. 
  3. ↑ 3.0 3.1 3.2 3.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.  Vizier catalog entry
  4. ↑ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication (Carnegie Institution of Washington). Bibcode: 1953GCRV..C......0W. 
  5. ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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.  Vizier catalog entry
  6. ↑ 6.0 6.1 6.2 Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. Bibcode: 2011A&A...525A..71W. 
  7. ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal 573 (1): 359–365. doi:10.1086/340590. Bibcode: 2002ApJ...573..359A. 
  8. ↑ Abt, H. A.; Levy, S. G. (1978). "Binaries among B2-B5 IV, V absorption and emission stars". The Astrophysical Journal Supplement Series 36: 241–258. doi:10.1086/190498. Bibcode: 1978ApJS...36..241A. http://cdsads.u-strasbg.fr/full/1978ApJS...36..241A. 
  9. ↑ Dommanget, J.; Nys, O. (2002). "VizieR Online Data Catalog: CCDM (Catalog of Components of Double & Multiple stars) (Dommanget+ 2002)". VizieR On-line Data Catalog: I/274. Originally Published in: Observations et Travaux 54 1274. Bibcode: 2002yCat.1274....0D.  Vizier catalog entry
  10. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.  Vizier catalog entry
  11. ↑ Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S. 
  12. ↑ Walker, M. F. (1952). "A search for stars of the beta Canis Majoris type". Astronomical Journal 57: 227. doi:10.1086/106759. Bibcode: 1952AJ.....57..227W. 
  13. ↑ Adelman, S. J. (2001). "Research Note Hipparcos photometry: The least variable stars". Astronomy and Astrophysics 367: 297–298. doi:10.1051/0004-6361:20000567. Bibcode: 2001A&A...367..297A. 
  14. ↑ Dunham, D. W. et al. (1990). "The size and shape of (2) Pallas from the 1983 occultation of 1 Vulpeculae". The Astronomical Journal 99: 1636–1662. doi:10.1086/115446. Bibcode: 1990AJ.....99.1636D. 



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