4 Vulpeculae

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4 Vulpeculae
Observation data
Epoch J2000       Equinox J2000
Constellation Vulpecula
Right ascension 19h 25m 28.6030389750s [1]
Declination +19° 47′ 54.059820728″ [1]
Apparent magnitude  (V)5.16 [2]
Characteristics
Evolutionary stage red clump [3]
Spectral type K0 III [2]
B−V color index +0.980 [2]
Astrometry
Radial velocity (Rv)+0.95 ± 0.12 [1] km/s
Proper motion (μ)RA: +87.392 ± 0.137 [1] mas/yr
Dec.: -73.038 ± 0.152 [1] mas/yr
Parallax (π)12.5320±0.1008  mas [1]
Distance 260 ± 2  ly
(79.8 ± 0.6  pc)
Absolute magnitude  (MV)+0.54 [4]
Details
Mass 1.72 [2]   M☉
Radius 11.42 [1]   R☉
Luminosity 67.6 [2]   L☉
Surface gravity (log g)3.01 [5]   cgs
Temperature 4,763±26 [2]   K
Metallicity [Fe/H]−0.20 [5]   dex
Rotational velocity (v sin i)2.9 [6]  km/s
Age 2.63 [2]   Gyr
Other designations
4 Vul, BD+19°4010, Gaia DR2 4515855716012824704, HD 182762, HIP 95498, HR 7385, SAO 104818, WDS J19255+1948A [7]
Database references
SIMBAD data

4 Vulpeculae is a single, [8] orange-hued star in the northern constellation of Vulpecula. It forms part of the asterism, formerly thought to be an open cluster, called the coathanger or Brocchi's Cluster. [9] [10] The star is faintly visible to the naked eye with an apparent visual magnitude of 5.16. [2] The distance to this star, based upon an annual parallax shift of 12.5320±0.1008  mas , [1] is around 260  light years.

At the age of about 2.6 billion years old, [2] this is an aging giant star with a stellar classification of K0 III, [2] having exhausted the supply of hydrogen at its core and evolved off the main sequence. It is now a red clump giant, indicating that it is on the horizontal branch and is generating energy through the fusion of helium at its core. [3] The star has an estimated 1.72 [2] times the mass of the Sun and has expanded to 11.42 [1] times the Sun's radius. It is radiating 67.6 [2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,763 K. [2]

References

  1. 1 2 3 4 5 6 7 8 9 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. 1 2 3 4 5 6 7 8 9 10 11 12 13 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv: 1507.01466 , Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID   118505114.
  3. 1 2 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329 , Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID   16673121.
  4. ↑ 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, S2CID   119257644.
  5. 1 2 Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069 , Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID   118362423.
  6. ↑ Massarotti, Alessandro; et al. (2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi: 10.1088/0004-6256/135/1/209 .
  7. ↑ "4 Vul". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-04-05.
  8. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x , S2CID   14878976.
  9. ↑ Kaler, James B., "The Coathanger, A Non-Cluster", Stars, University of Illinois, retrieved 2018-04-07.
  10. ↑ Baumgardt, H. (December 1998), "The nature of some doubtful open clusters as revealed by HIPPARCOS", Astronomy and Astrophysics, 340: 402−414, Bibcode:1998A&A...340..402B.
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