S Scuti

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).[1] Its apparent magnitude is 6.80,[2] making it visible to the naked eye only under excellent conditions.

S Scuti
Observation data
Epoch J2000      Equinox J2000
Constellation Scutum
Right ascension 18h 50m 20.03715s[1]
Declination −07° 54′ 27.4270″[1]
Apparent magnitude (V) 6.80[2]
Characteristics
Spectral type C64[3]
Variable type SRb
Astrometry
Radial velocity (Rv)−0.20 ± 1.6[4] km/s
Proper motion (μ) RA: 7.92[1] mas/yr
Dec.: −4.55[1] mas/yr
Parallax (π)2.59 ± 0.57[1] mas
Distanceapprox. 1,300 ly
(approx. 390 pc)
Details
Radius386[3] R☉
Luminosity4634[3] L☉
Temperature2425[3] K
Other designations
BD−08° 4726, HD 174325, HIP 92442, HR 7089, SAO 142674
Database references
SIMBADdata

S Scuti is a semiregular variable star. Its class is SRb, and its pulsation cycle lasts 148 days.[3] It has a radius of 386 R☉.[3] S Scuti is also surrounded by a roughly spherical shell of dust. The shell was known earlier from its carbon dioxide emission lines.[5] The total mass of the dust is (7 ± 2)×10−5 M☉.[5]

References
  1. 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.
  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.
  3. 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.
  4. 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.
  5. 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.


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