Astronomy:T Cephei
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Short description: Star in the constellation Cepheus
.jpg) Region of NGC 7023, with T Cephei marked on the full-size image Credit: NASA, ESA and Digitized Sky Survey 2 | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 21h 09m 31.78348s[1] |
| Declination | +68° 29′ 27.2311″[1] |
| Apparent magnitude (V) | 5.2 - 11.3[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M6-9e[4] |
| U−B color index | +0.33[5] |
| B−V color index | +1.49[5] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | −8.03[6] km/s |
| Proper motion (μ) | RA: −44.210[1] mas/yr Dec.: −44.921[1] mas/yr |
| Parallax (π) | 5.4400 ± 0.3476[1] mas |
| Distance | 600 ± 40 ly (180 ± 10 pc) |
| Details | |
| Mass | 0.55[7] M☉ |
| Radius | 329+70 −50[8] R☉ |
| Luminosity | 5,700[9] L☉ |
| Temperature | 2,400[9] - 3,347[10] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The visual band light curve of T Cephei, from AAVSO data[11]
T Cephei is a Mira variable star in the constellation Cepheus. Located approximately 600 light-years (180 parsecs) distant, it varies between magnitudes 5.2 and 11.3 over a period of around 388 days.[9][2]
T Cephei is a red giant of spectral type M6-9e with an effective temperature 2,400 K, a radius of 329 R☉, a mass of 0.55 M☉, and a luminosity of 5,700 L☉. If it were in the place of the Sun, its photosphere would at least engulf the orbit of Mars. This star is believed to be in a late stage of its life, blowing off its own atmosphere to form a white dwarf in a distant future.
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.0 2.1 VSX (4 January 2010). "T Cep". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=8355. Retrieved 1 July 2014.
- ↑ 3.0 3.1 Danilovich, T.; Ramstedt, S.; Gobrecht, D.; Decin, L.; De Beck, E.; Olofsson, H. (2018). "Sulphur-bearing molecules in AGB stars". Astronomy & Astrophysics 617: A132. doi:10.1051/0004-6361/201833317.
- ↑ Keenan, Philip C.; Garrison, Robert F.; Deutsch, Armin J. (1974). "Revised Catalog of Spectra of Mira Variables of Types ME and Se". Astrophysical Journal Supplement 28: 271. doi:10.1086/190318. Bibcode: 1974ApJS...28..271K.
- ↑ 5.0 5.1 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F.
- ↑ Tuchman, Y. (1991). "The mode of pulsation in Mira variables determined by the observed acceleration data". The Astrophysical Journal 383: 779. doi:10.1086/170836. Bibcode: 1991ApJ...383..779T.
- ↑ Weigelt, Gerd; Beckmann, Udo; Berger, Jean-Philippe; Bloecker, Thomas; Brewer, Michael K.; Hofmann, Karl-Heinz; Lacasse, Marc G.; Malanushenko, Victor et al. (2003). "JHK-band spectro-interferometry of T Cep with the IOTA interferometer". in Traub, Wesley A. Interferometry for Optical Astronomy II. Proc. SPIE. 4838. Society of Photo-optical Instrumentation Engineers (SPIE). pp. 181–184. doi:10.1117/12.458659. ISBN 9780819446176. Bibcode: 2003SPIE.4838..181W. https://resolver.caltech.edu/CaltechAUTHORS:20190115-111457389.
- ↑ 9.0 9.1 9.2 Danilovich, T.; Teyssier, D.; Justtanont, K.; Olofsson, H.; Cerrigone, L.; Bujarrabal, V.; Alcolea, J.; Cernicharo, J. et al. (2015). "New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme". Astronomy & Astrophysics 581: A60. doi:10.1051/0004-6361/201526705. Bibcode: 2015A&A...581A..60D.
- ↑ Guha Niyogi, Suklima; Speck, Angela K.; Onaka, Takashi (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): 93. doi:10.1088/0004-637X/733/2/93. Bibcode: 2011ApJ...733...93G.
- ↑ "Download Data". AAVSO. https://www.aavso.org/data-download.
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