Astronomy:4 Vulpeculae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 3.0 3.1 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal 539 (2): 732–741, doi:10.1086/309278, Bibcode: 2000ApJ...539..732A.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 Soubiran, C. et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics 515: A111, doi:10.1051/0004-6361/201014247, Bibcode: 2010A&A...515A.111S.
- ↑ 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ "4 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=4+Vul.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Kaler, James B., "The Coathanger, A Non-Cluster", Stars (University of Illinois), http://stars.astro.illinois.edu/sow/cthng-t.html, retrieved 2018-04-07.
- ↑ 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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