T Microscopii

T Microscopii

A visual band light curve of T Microscopii, plotted from ASAS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Microscopium
Right ascension 20h 27m 55.18840s[2]
Declination −28° 15′ 39.8035″[2]
Apparent magnitude (V) 6.74 - 8.11[3]
Characteristics
Spectral type M6-M8IIIe[3]
Variable type SRb[3]
Astrometry
Proper motion (μ) RA: −4.682±0.594[4] mas/yr
Dec.: 12.562±0.433[4] mas/yr
Parallax (π)5.1811 ± 0.3864 mas[4]
Distance630 ± 50 ly
(190 ± 10 pc)
Details
Radius382[5] R☉
Luminosity7,509[5] L☉
Surface gravity (log g)−0.427[5] cgs
Temperature2,750[5] K
Other designations
T Microscopii, HIP 100935, HD 194676, SAO 189308, CD−28°16682
Database references
SIMBADdata

T Microscopii is a semiregular variable star in the constellation Microscopium. It ranges from magnitude 6.74 to 8.11 over a period of 352 days.[3] Located around 700 light-years distant, it shines with a bolometric luminosity 7,509 times that of the Sun and has a surface temperature of 2,750 K.[5]

In 1896 it was announced that Williamina Fleming had discovered that the star is a variable star, based on photographs taken from 1888 through 1895.[6] It was listed with its variable star designation, T Microscopii, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars.[7]

References

  1. ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  2. ^ a b van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  3. ^ a b c d Otero, Sebastian Alberto (20 June 2011). "T Microscopii". AAVSO Website. American Association of Variable Star Observers. Retrieved 24 March 2015.
  4. ^ a b c 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.
  5. ^ a b c d e McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. S2CID 73594365.
  6. ^ Pickering, E. C.; Fleming, W. P. (April 1896). "Harvard College Observatory, circular no. 6. New variable stars". Astrophysical Journal. 3: 296–302. Bibcode:1896ApJ.....3..296P. doi:10.1086/140219. Retrieved 19 December 2024.
  7. ^ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C. Retrieved 18 December 2024.


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