| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vulpecula1 |
| Right ascension | 19h 25m 28.6030s2 |
| Declination | +19° 47′ 54.060″2 |
| Apparent magnitude (V) | 5.163 |
| Characteristics | |
| Evolutionary stage | red clump4 |
| Spectral type | K0 III3 |
| B−V color index | +0.9803 |
| Astrometry | |
| Radial velocity (Rv) | +0.95±0.122 km/s |
| Proper motion (μ) | RA: +87.392±0.1372 mas/yr Dec.: −73.038±0.1522 mas/yr |
| Parallax (π) | 12.5320±0.1008 mas2 |
| Distance | 260 ± 2 ly (79.8 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.541 |
| Details | |
| Mass | 1.723 M☉ |
| Radius | 11.422 R☉ |
| Luminosity | 67.63 L☉ |
| Surface gravity (log g) | 3.015 cgs |
| Temperature | 4,763±263 K |
| Metallicity [Fe/H] | −0.205 dex |
| Rotational velocity (v sin i) | 2.96 km/s |
| Age | 2.633 Gyr |
| Other designations | |
| 4 Vul, BD+19°4010, HD 182762, HIP 95498, HR 7385, SAO 104818, WDS J19255+1948A, Gaia DR2 45158557160128247047 | |
| 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.910 The star is faintly visible to the naked eye with an apparent visual magnitude of 5.16.3 The distance to this star, based upon an annual parallax shift of 12.5320±0.1008 mas,2 is around 260 light years.
At the age of about 2.6 billion years old,3 this is an aging giant star with a stellar classification of K0 III,3 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.4 The star has an estimated 1.723 times the mass of the Sun and has expanded to 11.422 times the Sun's radius. It is radiating 67.63 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,763 K.3
References
References
- 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. XHIP record for this object at VizieR.
- 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.
- 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.
- 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.
- 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.
- 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.
- "4 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-05.
- 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.
- Kaler, James B., "The Coathanger, A Non-Cluster", Stars, University of Illinois, 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.