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S Crucis 
Summary
S Crucis is a star in the constellation Crux. A Cepheid variable, its apparent magnitude ranges from 6.22 to 6.92 over 4.68997 d.[2] It is a yellow-white supergiant that pulsates between spectral types F6Ib-II and G1Ib-II.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 54m 21.99728s[1] |
| Declination | −58° 25′ 50.2146″[1] |
| Apparent magnitude (V) | 6.22 - 6.92[2] |
| Characteristics | |
| Spectral type | F6-G1Ib-II[2] |
| Variable type | δ Cep[2] |
| Astrometry | |
| Radial velocity (Rv) | −6.10[3] (−21.1 - 5.9)[4] km/s |
| Proper motion (μ) | RA: −9.480[1] mas/yr Dec.: 3.987[1] mas/yr |
| Parallax (π) | 1.0215 ± 0.0448 mas[1] |
| Distance | 3,200 ± 100 ly (980 ± 40 pc) |
| Absolute magnitude (MV) | -3.27[5] |
| Details | |
| Radius | 37.9[6] R☉ |
| Surface gravity (log g) | 1.2 - 1.9[4] cgs |
| Temperature | 5,517 - 6,482[4] K |
| Metallicity [Fe/H] | −0.07 - 0.16[4] dex |
| Age | 116[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
S Crucis is a pulsating variable star of the δ Cephei type, a Classical Cepheid variable. Its mean radius is 37.9 R☉ and that radius varies by up to 4.1 R☉ during its 4.7-day pulsation cycle.[6] Over the same cycle, the effective temperature varies between 5,517 K and 6,482 K.[4] The star is thought to be 116 million years old; it has exhausted its core hydrogen and left the main sequence.[7]
References edit
- ^ a b c d e 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 c d e Watson, Christopher (4 January 2010). "S Crucis". AAVSO Website. American Association of Variable Star Observers. Retrieved 12 March 2014.
- ^ 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.
- ^ a b c d e Proxauf, B.; Da Silva, R.; Kovtyukh, V. V.; Bono, G.; Inno, L.; Lemasle, B.; Pritchard, J.; Przybilla, N.; Storm, J.; Urbaneja, M. A.; Valenti, E.; Bergemann, M.; Buonanno, R.; d'Orazi, V.; Fabrizio, M.; Ferraro, I.; Fiorentino, G.; François, P.; Iannicola, G.; Laney, C. D.; Kudritzki, R. -P.; Matsunaga, N.; Nonino, M.; Primas, F.; Romaniello, M.; Thévenin, F. (2018). "A new and homogeneous metallicity scale for Galactic classical Cepheids. I. Physical parameters". Astronomy and Astrophysics. 616: A82. arXiv:1805.00727. Bibcode:2018A&A...616A..82P. doi:10.1051/0004-6361/201833087. S2CID 119078747.
- ^ Molinaro, R.; Ripepi, V.; Marconi, M.; Bono, G.; Lub, J.; Pedicelli, S.; Pel, J. W. (2011). "CORS Baade-Wesselink method in the Walraven photometric system: The period-radius and the period-luminosity relation of classical Cepheids". Monthly Notices of the Royal Astronomical Society. 413 (2): 942. arXiv:1012.4376. Bibcode:2011MNRAS.413..942M. doi:10.1111/j.1365-2966.2010.18183.x.
- ^ a b Moskalik, P.; Gorynya, N. A. (2005). "Mean Angular Diameters and Angular Diameter Amplitudes of Bright Cepheids". Acta Astronomica. 55: 247. arXiv:astro-ph/0507076. Bibcode:2005AcA....55..247M.
- ^ a b 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. Bibcode:2013AstL...39..851M. doi:10.1134/S1063773713120050. S2CID 119788977.
- ^ "V* S Cru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 12 March 2014.