V Centauri

V Centauri
	; A light curve for V Centauri, plotted from Hipparcos data
Observation data; Epoch J2000 Equinox J2000
Constellation	Centaurus
Right ascension	14h 32m 33.0833s
Declination	−56° 53′ 15.774″
Apparent magnitude (V)	6.42 - 7.22
Characteristics
Spectral type	F5 Ib/II
B−V color index	0.87
Variable type	Classical Cepheid
Astrometry
Radial velocity (Rv)	−18.90 ± 1.4 km/s
Proper motion (μ)	RA: −6.697 mas/yr ; Dec.: −7.068 mas/yr
Parallax (π)	1.3898 ± 0.0221 mas
Distance	2,350 ± 40 ly ; (720 ± 10 pc)
Details
Mass	4.3 M☉
Radius	40 R☉
Luminosity	1,657 L☉
Surface gravity (log g)	1.89 cgs
Temperature	5,500 K
Metallicity	+0.12 dex
Age	103 Myr
Other designations
	V Cen, CD−56°5479, HD 127297, HIP 71116, HR 5421, SAO 241777
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". Hipparcos. ESA. Retrieved 8 December 2021.
^ ^a ^b ^c ^d ^e ^f ^g Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c Samus, N. N.; Durlevich, O. V.; 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.
^ ^a ^b "V* V Cen". SIMBAD. Centre de données astronomiques de Strasbourg.
^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ Marconi, Marcella; et al. (July 2020). "Predicted Masses of Galactic Cepheids in the Gaia Data Release 2". The Astrophysical Journal Letters. 898 (1): L7. arXiv:2006.16610. Bibcode:2020ApJ...898L...7M. doi:10.3847/2041-8213/aba12b. S2CID 220265392. L7.
^ ^a ^b Groenewegen, M. A. T. (2020). "Analysing the spectral energy distributions of Galactic classical Cepheids". Astronomy and Astrophysics. 635: A33. arXiv:2002.02186. Bibcode:2020A&A...635A..33G. doi:10.1051/0004-6361/201937060. S2CID 211043995.
^ Ripepi, V.; Catanzaro, G.; Clementini, G.; De Somma, G.; Drimmel, R.; Leccia, S.; Marconi, M.; Molinaro, R.; Musella, I.; Poggio, E. (2022). "Classical Cepheid period-Wesenheit-metallicity relation in the Gaia bands". Astronomy and Astrophysics. 659: A167. arXiv:2201.01126. Bibcode:2022A&A...659A.167R. doi:10.1051/0004-6361/202142649. S2CID 245668845.
^ Skowron, D. M.; Skowron, J.; Mróz, P.; Udalski, A.; Pietrukowicz, P.; Soszyński, I.; Szymański, M. K.; Poleski, R.; Kozłowski, S.; Ulaczyk, K.; Rybicki, K.; Iwanek, P.; . Wrona, M.; Gromadzki, M. (2019). "Mapping the Northern Galactic Disk Warp with Classical Cepheids". Acta Astronomica. 69 (4): 305. arXiv:1912.11142. Bibcode:2019AcA....69..305S. doi:10.32023/0001-5237/69.4.1. S2CID 209460868.
^ ^a ^b 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)". Astronomy Letters. 39 (7): 432–445. Bibcode:2013AstL...39..432U. doi:10.1134/S1063773713070074. ISSN 1063-7737. S2CID 121213614.

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[HipDataAccess-1] "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.

[dr3-2] ^ ^a ^b ^c ^d ^e ^f ^g Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[gcvs-3] Samus, N. N.; Durlevich, O. V.; 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.

[Houk1975-4] 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.

[SIMBAD-5] "V* V Cen". SIMBAD. Centre de données astronomiques de Strasbourg.

[Gontcharov-6] Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.

[marconi2020-7] Marconi, Marcella; et al. (July 2020). "Predicted Masses of Galactic Cepheids in the Gaia Data Release 2". The Astrophysical Journal Letters. 898 (1): L7. arXiv:2006.16610. Bibcode:2020ApJ...898L...7M. doi:10.3847/2041-8213/aba12b. S2CID 220265392. L7.

[groenewegen2020-8] Groenewegen, M. A. T. (2020). "Analysing the spectral energy distributions of Galactic classical Cepheids". Astronomy and Astrophysics. 635: A33. arXiv:2002.02186. Bibcode:2020A&A...635A..33G. doi:10.1051/0004-6361/201937060. S2CID 211043995.

[ripepi2022-9] Ripepi, V.; Catanzaro, G.; Clementini, G.; De Somma, G.; Drimmel, R.; Leccia, S.; Marconi, M.; Molinaro, R.; Musella, I.; Poggio, E. (2022). "Classical Cepheid period-Wesenheit-metallicity relation in the Gaia bands". Astronomy and Astrophysics. 659: A167. arXiv:2201.01126. Bibcode:2022A&A...659A.167R. doi:10.1051/0004-6361/202142649. S2CID 245668845.

[skowran2019-10] Skowron, D. M.; Skowron, J.; Mróz, P.; Udalski, A.; Pietrukowicz, P.; Soszyński, I.; Szymański, M. K.; Poleski, R.; Kozłowski, S.; Ulaczyk, K.; Rybicki, K.; Iwanek, P.; . Wrona, M.; Gromadzki, M. (2019). "Mapping the Northern Galactic Disk Warp with Classical Cepheids". Acta Astronomica. 69 (4): 305. arXiv:1912.11142. Bibcode:2019AcA....69..305S. doi:10.32023/0001-5237/69.4.1. S2CID 209460868.

[Usenko_432–445-11] 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)". Astronomy Letters. 39 (7): 432–445. Bibcode:2013AstL...39..432U. doi:10.1134/S1063773713070074. ISSN 1063-7737. S2CID 121213614.

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Observation data Epoch J2000 Equinox J2000
A light curve for V Centauri, plotted from Hipparcos data^[1]
Constellation	Centaurus
Right ascension	14^h 32^m 33.0833^s^[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 (R_v)	−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 mas^[2]
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	+0.12^[9] dex
Age	103^[10] Myr

Other designations
V Cen, CD−56°5479, HD 127297, HIP 71116, HR 5421, SAO 241777^[5]
Database references
SIMBAD	data