Astronomy:T Ceti
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 21m 46.27529s[2] |
| Declination | −20° 03′ 28.9098″[2] |
| Apparent magnitude (V) | 5.61[3] (5.0 - 6.9)[4] |
| Characteristics | |
| Spectral type | M5-6Se[5] |
| B−V color index | 1.58±0.03[3] |
| Variable type | SRc[6] |
| Astrometry | |
| Radial velocity (Rv) | +28.9±0.9[7] km/s |
| Proper motion (μ) | RA: +59.665[2] mas/yr Dec.: −10.229[2] mas/yr |
| Parallax (π) | 3.70 ± 0.47[8] mas |
| Distance | approx. 900 ly (approx. 270 pc) |
| Absolute magnitude (MV) | −1.51[3] |
| Details[6] | |
| Mass | 3.0±0.3 M☉ |
| Radius | 275±34 R☉ |
| Luminosity | 8,128+2,587 −1,962 L☉ |
| Surface gravity (log g) | 0.01±0.11 cgs |
| Temperature | 3,396+103 −100 K |
| Metallicity [Fe/H] | 0.0 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
T Ceti is a semiregular variable star located in the equatorial constellation of Cetus. It varies between magnitudes 5.0 and 6.9 over 159.3 days, making it faintly visible to the naked eye except when near minimum brightness.[4] The stellar parallax shift measured by Hipparcos is 3.7 mas,[8] which yields a distance estimate of roughly 900 light years. It is moving further from the Earth with a heliocentric radial velocity of +29 km/s.[7]
Seth Carlo Chandler discovered that the star is a variable star, during the northern hemisphere winter of 1881-1882.[10] It was listed with its variable star designation, T Ceti, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars.[11]
This is an MS-type star on the asymptotic giant branch with a spectral type of M5-6Se.[5] (The 'e' notation indicates the presence of emission lines in the spectrum). The star is losing mass at the rate of 8.2×10−8 M☉ y−1,[12] and it is surrounded by a circumstellar dust shell consisting of crystallized, mostly iron-rich silicates.[13]
T Ceti has an estimated three times the mass of the Sun and has expanded to 275 times the Sun's radius. It is radiating 8,128 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,396 K.[6]
References
- ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. http://www.astrouw.edu.pl/asas/?page=aasc.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 3.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 4.0 4.1 Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ 5.0 5.1 Keenan, Philip C (1954). "Classification of the S-Type Stars". The Astrophysical Journal 120: 484. doi:10.1086/145937. Bibcode: 1954ApJ...120..484K.
- ↑ 6.0 6.1 6.2 Cruzalebes, P. et al. (2013). "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER". Monthly Notices of the Royal Astronomical Society 434 (1): 437–450. doi:10.1093/mnras/stt1037. Bibcode: 2013MNRAS.434..437C.
- ↑ 7.0 7.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 8.0 8.1 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ "T Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=T+Cet.
- ↑ Chandler, S. C., Jr. (May 1883). "On the Variability of 36 (Uran. Argentina) Ceti". Astronomische Nachrichten 105: 333–336. Bibcode: 1883AN....105..333C. https://articles.adsabs.harvard.edu/pdf/1883AN....105..333C. Retrieved 19 December 2024.
- ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory 55: 1–94. Bibcode: 1907AnHar..55....1C. https://articles.adsabs.harvard.edu/pdf/1907AnHar..55....1C. Retrieved 18 December 2024.
- ↑ "Carbon isotopic abundance ratios in S-type stars", Astronomy & Astrophysics 535: 7, November 2011, doi:10.1051/0004-6361/201015280, A101, Bibcode: 2011A&A...535A.101W
- ↑ Guha Niyogi, Suklima et al. (June 2011), "A Temporal Study of the Oxygen-rich Pulsating Variable Asymptotic Giant Branch Star, T Cep: Investigation on Dust Formation and Dust Properties", The Astrophysical Journal 733 (2): 15, doi:10.1088/0004-637X/733/2/93, 93, Bibcode: 2011ApJ...733...93G
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