19 Vulpeculae is star located approximately 1,690[1] light years from Earth in the northern constellation of Vulpecula.[9] It is a probable member of the open cluster NGC 6882.[4] This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.40.[2] It is moving closer to the Earth with a heliocentric radial velocity of −19 km/s.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 20h 11m 47.9738s[1] |
| Declination | 26° 48′ 32.3736″[1] |
| Apparent magnitude (V) | 5.40[2] |
| Characteristics | |
| Spectral type | K2 IIIa[3] |
| B−V color index | 1.40[4] |
| Astrometry | |
| Radial velocity (Rv) | −19.33±0.11[4] km/s |
| Proper motion (μ) | RA: 1.619±0.119[1] mas/yr Dec.: −10.600±0.122[1] mas/yr |
| Parallax (π) | 1.9328 ± 0.0779 mas[1] |
| Distance | 1,690 ± 70 ly (520 ± 20 pc) |
| Absolute magnitude (MV) | −2.60[5] |
| Details | |
| Mass | 4.94±0.53[6] M☉ |
| Radius | 100.3+1.7 −3.0[1] R☉ |
| Luminosity | 2,889±145[1] L☉ |
| Surface gravity (log g) | 1.40[7] cgs |
| Temperature | 4,200[7] K |
| Metallicity [Fe/H] | −0.01[7] dex |
| Rotational velocity (v sin i) | < 3.4[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging giant star with a stellar classification of K2 IIIa,[3] having already consumed the hydrogen at its core and evolved away from the main sequence. It has nearly five[6] times the mass of the Sun but has expanded to around 100[1] times the Sun's radius. The star is radiating 2,889[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,200 K.[7]
References
edit- ^ a b c d e f g h i j 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.
- ^ a b Fernie, J. D. (1983). "New UBVRI photometry for 900 supergiants". Astrophysical Journal Supplement Series. 52: 7. Bibcode:1983ApJS...52....7F. doi:10.1086/190856.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
- ^ a b c d Mermilliod, J. C.; et al. (2008). "Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters". Astronomy & Astrophysics. 485 (1): 303–314. Bibcode:2008A&A...485..303M. CiteSeerX 10.1.1.30.7545. doi:10.1051/0004-6361:200809664.
- ^ 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.
- ^ a b Hohle, M.M.; et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID 111387483.
- ^ a b c d Luck, R. Earle (March 1994). "Open Cluster Chemical Composition. I. Later Type Stars in Eight Clusters". Astrophysical Journal Supplement. 91: 309. Bibcode:1994ApJS...91..309L. doi:10.1086/191940.
- ^ De Medeiros, J. R.; et al. (November 2000). "Rotation and lithium in single giant stars". Astronomy and Astrophysics. 363: 239–243. arXiv:astro-ph/0010273. Bibcode:2000A&A...363..239D.
- ^ a b "19 Vulpeculae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-11-18.
External links
edit- 19 Vulpeculae on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images