Astronomy:U Vulpeculae
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Short description: Variable star in the constellation Vulpecula
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 36m 37.7281s[2] |
| Declination | 20° 19′ 58.5692″[2] |
| Apparent magnitude (V) | 6.73 - 7.54[3] |
| Characteristics | |
| Spectral type | F6Iab-G2[4] |
| Variable type | δ Cep[3] |
| Astrometry | |
| Proper motion (μ) | RA: 0.906±0.050[2] mas/yr Dec.: −0.960±0.062[2] mas/yr |
| Parallax (π) | 1.0530 ± 0.0390[2] mas |
| Distance | 3,100 ± 100 ly (950 ± 40 pc) |
| Absolute magnitude (MV) | -3.69[5] |
| Orbit[6] | |
| Period (P) | 2,510 days |
| Eccentricity (e) | 0.675 |
| Periastron epoch (T) | 2444800 |
| Argument of periastron (ω) (secondary) | 353° |
| Semi-amplitude (K1) (primary) | 3.64 km/s |
| Details | |
| Mass | 6.5[7] M☉ |
| Radius | 60[7] R☉ |
| Surface gravity (log g) | 1.75 - 1.85[8] cgs |
| Temperature | 5,655 - 5,965[8] K |
| Metallicity [Fe/H] | 0.09[9] dex |
| Age | 82[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
U Vulpeculae is a variable and binary star in the constellation Vulpecula.
It is a classical Cepheid variable and its apparent magnitude ranges from 6.73 to 7.54 over a precise cycle of 7.99 days.[4] Its variable nature was discovered in 1898 at Potsdam Observatory by Gustav Müller and Paul Kempf.[11]
In 1991 a study of radial velocities showed that it U Vulpeculae is a spectroscopic binary and a full orbit with a period of 2510 days (6.9 years) was first calculated in 1996.[12][7] The secondary star is invisible and is only known from its effect on the motion of the primary.[6]
References
- ↑ Kiss, Laszlo L. (July 1998). "A photometric and spectroscopic study of the brightest northern Cepheids - I. Observations". Monthly Notices of the Royal Astronomical Society 297 (3): 825. doi:10.1046/j.1365-8711.1998.01559.x. Bibcode: 1998MNRAS.297..825K.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 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: B/gcvs. Bibcode: 2009yCat....102025S.
- ↑ 4.0 4.1 Watson, Christopher (4 January 2010). "U Vulpeculae". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=38179.
- ↑ Kovtyukh, V. V.; Chekhonadskikh, F. A.; Luck, R. E.; Soubiran, C.; Yasinskaya, M. P.; Belik, S. I. (2010). "Accurate luminosities for F-G supergiants from FeII/FeI line depth ratios". Monthly Notices of the Royal Astronomical Society 408 (3): 1568. doi:10.1111/j.1365-2966.2010.17217.x. Bibcode: 2010MNRAS.408.1568K.
- ↑ 6.0 6.1 Groenewegen, M. A. T. (2008). "Baade-Wesselink distances and the effect of metallicity in classical cepheids". Astronomy and Astrophysics 488 (1): 25–35. doi:10.1051/0004-6361:200809859. Bibcode: 2008A&A...488...25G.
- ↑ 7.0 7.1 7.2 Imbert, M. (1996). "Cepheids and binarity. II. Radial velocities and spectroscopic orbits of four galactic Cepheids: RX Camelopardalis, MW Cygni, Z Lacertae and U Vulpeculae" (in fr). Astronomy and Astrophysics Supplement 116: 497–514. doi:10.1051/aas:1996312. Bibcode: 1996A&AS..116..497I.
- ↑ 8.0 8.1 Andrievsky, S. M.; Lépine, J. R. D.; Korotin, S. A.; Luck, R. E.; Kovtyukh, V. V.; MacIel, W. J. (2013). "Barium abundances in Cepheids". Monthly Notices of the Royal Astronomical Society 428 (4): 3252. doi:10.1093/mnras/sts270. Bibcode: 2013MNRAS.428.3252A.
- ↑ 9.0 9.1 Marsakov, V. A.; Koval', V. V.; Kovtyukh, V. V.; Mishenina, T. V. (2013). "Properties of the population of classical Cepheids in the Galaxy". Astronomy Letters 39 (12): 851. doi:10.1134/s1063773713120050. Bibcode: 2013AstL...39..851M.
- ↑ "U Vulpeculae". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=U+Vulpeculae.
- ↑ Müller, G.; Kempf, P. (1898). "Zwei neue Veränderliche von kurzer Periode" (in de). Astronomische Nachrichten 146 (3): 37–42. doi:10.1002/asna.18981460303. Bibcode: 1898AN....146...37M. https://zenodo.org/record/1424765/files/article.pdf.
- ↑ Szabados, L. (1991). "Northern Cepheids: Period Update and Duplicity Effects". Communications of the Konkoly Observatory 11 part 3 (96): 123–244. Bibcode: 1991CoKon..96..123S. http://articles.adsabs.harvard.edu/full/1991CoKon..96..123S.
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