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TZ Cassiopeiae

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TZ Cassiopeiae
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 23h 52m 56.23733s[1]
Declination 61° 00′ 08.3786″[1]
Apparent magnitude (V) 9.18[2] (+8.86 - +10.5[3])
Characteristics
Spectral type M2Iab[3]
U−B color index +2.43[2]
B−V color index +2.57[2]
Variable type Lc[3]
Astrometry
Radial velocity (Rv)−54.28[4] km/s
Proper motion (μ) RA: −2.77[1] mas/yr
Dec.: −3.10[1] mas/yr
Parallax (π)0.39 ± 0.76 mas[1]
Distance2,400[5] pc
Absolute magnitude (MV)−5.98[6]
Details
Mass15[7] M☉
Radius800[6] R☉
Luminosity98,000[6] L☉
Surface gravity (log g)-0.1[6] cgs
Temperature3,600[6] K
Other designations
BD+60°2634, HIP 117763, SAO 20192, 2MASS J23525623+6100083, AAVSO 2348+60
Database references
SIMBADdata

TZ Cassiopeaie (TZ Cas, HIP 117763, SAO 20912) is a variable star in the constellation Cassiopeia with an apparent magnitude of around +9. It is approximately 8,000 light-years away from Earth. The star is a red supergiant star with a spectrum type of M2 and a temperature of 3,600 Kelvin. Currently, it packs 15 solar masses within itself.

TZ Cassiopeaie is a slow irregular variable star with possible periods of 290, 2,800, and 3,100 days.[8] It is approximately 98,000 times the luminosity of the Sun, and it is 800 times bigger than the Sun.

References

  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c 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.
  3. ^ a b c Percy, J. R.; Terziev, E. (2011). "Studies of "Irregularity" in Pulsating Red Giants. III. Many More Stars, an Overview, and Some Conclusions". The Journal of the American Association of Variable Star Observers. 39: 1. Bibcode:2011JAVSO..39....1P.
  4. ^ 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. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  5. ^ Mauron, Nicolas; Josselin, Eric (2010). "The mass-loss rates of red supergiants and the de Jager prescription". Astronomy & Astrophysics. 526: A156. arXiv:1010.5369v1. doi:10.1051/0004-6361/201013993.
  6. ^ a b c d e Levesque, E. M.; Massey, P.; Olsen, K. A. G.; Plez, B.; Josselin, E.; Maeder, A.; Meynet, G. (2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not as Cool as We Thought". The Astrophysical Journal. 628 (2): 973. arXiv:astro-ph/0504337. Bibcode:2005ApJ...628..973L. doi:10.1086/430901.
  7. ^ Josselin, E.; Plez, B. (2007). "Atmospheric dynamics and the mass loss process in red supergiant stars". Astronomy and Astrophysics. 469 (2): 671. Bibcode:2007A&A...469..671J. doi:10.1051/0004-6361:20066353.
  8. ^ Kiss, L. L.; Szabó, G. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society. 372 (4): 1721. arXiv:astro-ph/0608438. Bibcode:2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x.
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