T Cephei

T Cephei is a Mira variable star in the constellation Cepheus. Located approximately 570 ± 40 light-years (175 ± 12 parsecs) distant, it varies between magnitudes 5.2 and 11.3 over a period of around 388 days.[5][2]

T Cephei

Region of NGC 7023, with T Cephei marked on the full-size image
Credit: NASA, ESA and Digitized Sky Survey 2
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension  21h 09m 31.78089s[1]
Declination +68° 29 27.2038[1]
Apparent magnitude (V) 5.2 - 11.3[2]
Characteristics
Spectral type M6-9e[3]
U−B color index +0.33[4]
B−V color index +1.49[4]
Variable type Mira[5]
Astrometry
Radial velocity (Rv)8.03[6] km/s
Proper motion (μ) RA: 44.145[7] mas/yr
Dec.: 42.308[7] mas/yr
Parallax (π)5.6912 ± 0.4004[7] mas
Distance570 ± 40 ly
(180 ± 10 pc)
Details
Mass0.55[8] M
Radius329+70
−50
[9] R
Luminosity5,700[5] L
Temperature2,400[5] K
Other designations
T Cephei, HR 8113, HD 202012, HIP 104451, BD+67°1291, GC 29611, SAO 19229, GSC 04460-02400
Database references
SIMBADdata

Stellar Properties

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 sooty atmosphere to form a white dwarf in a distant future.

gollark: This is a strong expression of my disapproval. Do you want me to marry you to egoism?
gollark: ++delete <@!341618941317349376> (literally self-proclaimed egoist)
gollark: Ah, THAT explains a lot.
gollark: I doubt it.
gollark: I mean, according to the moral standards they would have followed, yes. It's subjective.

See also

References

  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. VSX (4 January 2010). "T Cep". AAVSO Website. American Association of Variable Star Observers. Retrieved 1 July 2014.
  3. 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. Bibcode:1974ApJS...28..271K. doi:10.1086/190318.
  4. 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.
  5. Danilovich, T.; Teyssier, D.; Justtanont, K.; Olofsson, H.; Cerrigone, L.; Bujarrabal, V.; Alcolea, J.; Cernicharo, J.; Castro-Carrizo, A.; García-Lario, P.; Marston, A. (2015). "New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme". Astronomy & Astrophysics. 581: A60. arXiv:1506.09065. Bibcode:2015A&A...581A..60D. doi:10.1051/0004-6361/201526705.
  6. 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. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  7. 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.
  8. . doi:10.1086/170836. Cite journal requires |journal= (help); Missing or empty |title= (help)
  9. Weigelt, Gerd; Beckmann, Udo; Berger, Jean-Philippe; Bloecker, Thomas; Brewer, Michael K.; Hofmann, Karl-Heinz; Lacasse, Marc G.; Malanushenko, Victor; Millan-Gabet, Rafael; et al. (2003). "JHK-band spectro-interferometry of T Cep with the IOTA interferometer". Interferometry for Optical Astronomy II. Proc. SPIE. 4838. pp. 181–184. Bibcode:2003SPIE.4838..181W. doi:10.1117/12.458659.
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