Astronomy:V Centauri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 14h 32m 33.0833s[2] |
| Declination | −56° 53′ 15.774″[2] |
| Apparent magnitude (V) | 6.42 - 7.22[3] |
| Characteristics | |
| Spectral type | F5 Ib/II[4] |
| B−V color index | 0.87[5] |
| Variable type | Classical Cepheid[3] |
| Astrometry | |
| Radial velocity (Rv) | −18.90 ± 1.4[6] km/s |
| Proper motion (μ) | RA: −6.697[2] mas/yr Dec.: −7.068[2] mas/yr |
| Parallax (π) | 1.3898 ± 0.0221[2] mas |
| Distance | 2,350 ± 40 ly (720 ± 10 pc) |
| Details | |
| Mass | 4.3[7] M☉ |
| Radius | 40[2] R☉ |
| Luminosity | 1,657[8] L☉ |
| Surface gravity (log g) | 1.89[2] cgs |
| Temperature | 5,500[8] K |
| Metallicity [Fe/H] | +0.12[9] dex |
| Age | 103[10] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
V Centauri (V Cen) is a Classical Cepheid variable, a type of variable star, in the constellation Centaurus. It is approximately 2,350 light-years (720 parsecs) away based on parallax.
V Centauri varies regularly between visual magnitudes 4.2 and 7.2 every 5.5 days. It is classified as a Cepheid variable on the basis of its light variations, with the brightness increase from minimum to maximum taking only a third of the time of the decrease from maximum to minimum. Cepheids are pulsating variable stars and V Centauri expands and contracts over its pulsation cycle as well as changing temperature.[3]
According to the South African Astronomical Observatory, the chemical composition was derived as being high in sodium (Na) and aluminium (Al) and low in magnesium (Mg).[11] Following a normal composition for a Cepheid star, V Cen does not have any unusual characteristics. V Centauri's composition was observed alongside six other Classical Cepheid variable stars with the support of Russian, Chilean, and Ukrainian observatories.[11]
References
- ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 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.
- ↑ Houk, N.; Cowley, A. P. (1975). "University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90°.0 to -53°.0.". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars 1. Bibcode: 1975mcts.book.....H.
- ↑ 5.0 5.1 "V* V Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+V+Cen.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ Marconi, Marcella et al. (July 2020). "Predicted Masses of Galactic Cepheids in the Gaia Data Release 2". The Astrophysical Journal Letters 898 (1): L7. doi:10.3847/2041-8213/aba12b. L7. Bibcode: 2020ApJ...898L...7M.
- ↑ 8.0 8.1 Groenewegen, M. A. T. (2020). "Analysing the spectral energy distributions of Galactic classical Cepheids". Astronomy and Astrophysics 635: A33. doi:10.1051/0004-6361/201937060. Bibcode: 2020A&A...635A..33G.
- ↑ Ripepi, V.; Catanzaro, G.; Clementini, G.; De Somma, G.; Drimmel, R.; Leccia, S.; Marconi, M.; Molinaro, R. et al. (2022). "Classical Cepheid period-Wesenheit-metallicity relation in the Gaia bands". Astronomy and Astrophysics 659: A167. doi:10.1051/0004-6361/202142649. Bibcode: 2022A&A...659A.167R.
- ↑ Skowron, D. M.; Skowron, J.; Mróz, P.; Udalski, A.; Pietrukowicz, P.; Soszyński, I.; Szymański, M. K.; Poleski, R. et al. (2019). "Mapping the Northern Galactic Disk Warp with Classical Cepheids". Acta Astronomica 69 (4): 305. doi:10.32023/0001-5237/69.4.1. Bibcode: 2019AcA....69..305S.
- ↑ 11.0 11.1 Usenko, I. A.; Kniazev, A. Yu; Berdnikov, L. N.; Kravtsov, V. V.; Fokin, A. B. (2013-07-01). "Spectroscopic studies of southern-hemisphere Cepheids: Six objects in Centaurus (V Cen, V737 Cen) and Sagittarius (BB Sgr, W Sgr, X Sgr, Y Sgr)" (in en). Astronomy Letters 39 (7): 432–445. doi:10.1134/S1063773713070074. ISSN 1063-7737. Bibcode: 2013AstL...39..432U.
 |  |
