S Scuti

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S Scuti
SSctLightCurve.png
A visual band light curve for S Scuti, plotted from ASAS data [1]
Observation data
Epoch J2000        Equinox J2000
Constellation Scutum
Right ascension 18h 50m 20.03715s [2]
Declination −07° 54′ 27.4270″ [2]
Apparent magnitude  (V)6.80 [3]
Characteristics
Spectral type C64 [4]
Variable type SRb
Astrometry
Radial velocity (Rv)−0.20 ± 1.6 [5] km/s
Proper motion (μ)RA: 7.92 [2] mas/yr
Dec.: −4.55 [2] mas/yr
Parallax (π)2.59±0.57  mas [2]
Distance approx. 1,300  ly
(approx. 390  pc)
Details [6]
Radius 288 [a]   R☉
Luminosity 4,300±100  L☉
Temperature 2,755  K
Other designations
BD−08° 4726, HD 174325, HIP 92442, HR 7089, SAO 142674
Database references
SIMBAD data

S Scuti is a carbon star located in the constellation Scutum. Parallax measurements by Hipparcos put it at a distance of approximately 1,300 light-years (390 parsecs). [2] Its apparent magnitude is 6.80, [3] making it not quite bright enough to be seen with the naked eye.

Contents

Louisa Dennison Wells discovered that the star is a variable star. Her discovery was announced in 1901. [7] It was listed with its variable star designation, S Scuti, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars. [8] S Scuti is a semiregular variable star. Its class is SRb, and its pulsation cycle lasts 148 days. [4] S Scuti is also surrounded by a roughly spherical shell of dust. The shell was known earlier from its carbon monoxide emission lines. [6] The total mass of the dust is (7 ± 2)×10−5 M☉. [6]

Notes

  1. ↑ Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772  K:

References

  1. ↑ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  2. 1 2 3 4 5 6 van Leeuwen, F.; et al. (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. S2CID   18759600.
  3. 1 2 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.
  4. 1 2 De Beck, E.; Decin, L.; De Koter, A.; Justtanont, K.; Verhoelst, T.; Kemper, F.; Menten, K. M. (2010). "Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles. II. CO line survey of evolved stars: Derivation of mass-loss rate formulae". Astronomy and Astrophysics. 523: A18. arXiv: 1008.1083 . Bibcode:2010A&A...523A..18D. doi:10.1051/0004-6361/200913771. S2CID   16131273.
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  6. 1 2 3 Mečina, M; Kerschbaum, F; Groenewegen, M. A. T; Ottensamer, R; Blommaert, J. A. D. L; Mayer, A; Decin, L; Luntzer, A; Vandenbussche, B; Posch, Th; Waelkens, C (2013). "Dusty shells surrounding the carbon variables S Scuti and RT Capricorni". Astronomy & Astrophysics. 566: A69. arXiv: 1405.2769 . Bibcode:2014A&A...566A..69M. doi:10.1051/0004-6361/201321117. S2CID   118597358.
  7. ↑ Pickering, E. C.; Colson, H. R.; Fleming, W. P.; Wells, L. D. (April 1901). "Sixty-four new variable stars". Astrophysical Journal. 13: 226–230. Bibcode:1901ApJ....13..226P. doi:10.1086/140808 . Retrieved 17 December 2024.
  8. ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C . Retrieved 16 December 2024.


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