9 Vulpeculae

9 Vulpeculae is a star in the northern constellation of Vulpecula, located about 550 light years away based on parallax.[1] It is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.00.[2] The star is moving further from the Earth with a heliocentric radial velocity of +5 km/s.[4]

9 Vulpeculae
Location of 9 Vulpeculae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Vulpecula
Right ascension  19h 34m 34.89594s[1]
Declination 19° 46′ 24.2371″[1]
Apparent magnitude (V) 5.00[2]
Characteristics
Spectral type B8 IIIn[3]
U−B color index −0.43[2]
B−V color index −0.09[2]
Astrometry
Radial velocity (Rv)+5.00[4] km/s
Proper motion (μ) RA: +13.091[1] mas/yr
Dec.: +5.470[1] mas/yr
Parallax (π)5.8651 ± 0.1830[1] mas
Distance560 ± 20 ly
(171 ± 5 pc)
Absolute magnitude (MV)−1.14[5]
Details
Luminosity431[5] L☉
Temperature10,917[6] K
Metallicity [Fe/H]0.00[7] dex
Rotational velocity (v sin i)185[8] km/s
Other designations
9 Vul, NSV 12173, BD+19°4063, GC 27047, HD 184606, HIP 96275, HR 7437, SAO 104990, WDS J19346+1946A[9]
Database references
SIMBADdata

This a B-type star with a stellar classification of B8 IIIn,[3] where the 'n' notation indicates "nebulous" lines due to rapid rotation. It has a high rate of spin with a projected rotational velocity of 185 km/s.[8] The star is radiating 431[5] times the Sun's luminosity from its photosphere at an effective temperature of 10,917 K.[6] This is a suspected variable star of unknown type, ranging in magnitude from 4.99 down to 5.08.[10]

9 Vulpeculae has two reported distant companions: component B, with a separation of 9.3" and magnitude 13.4, and C, with a separation of 108" and a magnitude of 12.5".[11][3] It is also a suspected variable star.[12]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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. 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
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. 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
  6. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427: 343. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. Vizier catalog entry
  7. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. Vizier catalog entry
  8. 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.
  9. "9 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-14.
  10. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S
  11. 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
  12. 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.
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