Astronomy:9 Vulpeculae

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Short description: Star in the constellation Vulpecula
9 Vulpeculae
Vulpecula constellation map.svg
Red circle.svg
Location of 9 Vulpeculae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Vulpecula
Right ascension  19h 34m 34.89705s[1]
Declination 19° 46′ 24.2423″[1]
Apparent magnitude (V) 5.010±0.009[2] (4.99 - 5.08)[3]
Characteristics
Spectral type B8 IIIn[4]
Apparent magnitude (U) 4.499±0.012[2]
Apparent magnitude (B) 4.906±0.011[2]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)+5.00[5] km/s
Proper motion (μ) RA: +13.148[1] mas/yr
Dec.: +5.142[1] mas/yr
Parallax (π)5.8317 ± 0.1242[1] mas
Distance560 ± 10 ly
(171 ± 4 pc)
Absolute magnitude (MV)−1.14[6]
Details
Mass3.5[7] M☉
Radius2.8[8] R☉
Luminosity216[8] L☉
Surface gravity (log g)3,54[7] cgs
Temperature12,042[7] K
Metallicity [Fe/H]−0.03[7] dex
Rotational velocity (v sin i)185[9] km/s
Age185[10] Myr
Other designations
9 Vul, NSV 12173, BD+19°4063, GC 27047, HD 184606, HIP 96275, HR 7437, SAO 104990, WDS J19346+1946A[11]
Database references
SIMBADdata

9 Vulpeculae is a star in the northern constellation of Vulpecula, located about 560 light years away based on parallax. It is visible to the naked eye as a faint, blue-white hued star with a baseline apparent visual magnitude of 5.01. The star is moving further from the Earth with a heliocentric radial velocity of +5 km/s.

This a B-type star with a stellar classification of B8 IIIn,[4] 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.[9] The star is radiating 216 times the Sun's luminosity from its photosphere at an effective temperature of 12,042 K. This is a suspected variable star of unknown type, ranging in magnitude from 4.99 down to 5.08.[3]

9 Vulpeculae has two reported 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".[12][4] Both are unrelated background objects.[13][14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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.
  2. ↑ 2.0 2.1 2.2 Harmanec, P. et al. (2020). "A new study of the spectroscopic binary 7 Vul with a Be star primary". Astronomy and Astrophysics 639: Table A.1. doi:10.1051/0004-6361/202037964. Bibcode: 2020A&A...639A..32H. 
  3. ↑ 3.0 3.1 3.2 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. 
  4. ↑ 4.0 4.1 4.2 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
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  6. ↑ 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
  7. ↑ 7.0 7.1 7.2 7.3 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  8. ↑ 8.0 8.1 Stassun, Keivan G. et al. (September 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal 156 (3): 102. doi:10.3847/1538-3881/aad050. ISSN 0004-6256. Bibcode: 2018AJ....156..102S. 
  9. ↑ 9.0 9.1 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. 
  10. ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G.  Vizier catalog entry
  11. ↑ "9 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=9+Vul. 
  12. ↑ 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
  13. ↑ 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.
  14. ↑ 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.



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