1 Vulpeculae

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 810 light years away based on parallax.[1]

1 Vulpeculae
Location of 1 Vulpeculae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Vulpecula
Right ascension  19h 16m 13.03970s[1]
Declination 21° 23′ 25.5339″[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: +0.21[1] mas/yr
Dec.: -6.84[1] mas/yr
Parallax (π)4.02 ± 0.37[1] mas
Distance810 ± 70 ly
(250 ± 20 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

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 the 29 May 1983, 1 Vulpeculae occulted 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. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 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. 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. Vizier catalog entry
  4. Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  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: 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. Vizier catalog entry
  6. Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014.
  7. Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573: 359. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
  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. Bibcode:1978ApJS...36..241A. doi:10.1086/190498.
  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. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
  11. Samus, N. N.; Durlevich, O. V.; 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....1.2025S.
  12. Walker, M. F. (1952). "A search for stars of the beta Canis Majoris type". Astronomical Journal. 57: 227. Bibcode:1952AJ.....57..227W. doi:10.1086/106759.
  13. Adelman, S. J. (2001). "Research Note Hipparcos photometry: The least variable stars". Astronomy and Astrophysics. 367: 297. Bibcode:2001A&A...367..297A. doi:10.1051/0004-6361:20000567.
  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. Bibcode:1990AJ.....99.1636D. doi:10.1086/115446.
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