S Scuti

S Scuti

A visual band light curve for S Scuti, plotted from ASAS data
Observation data
Epoch J2000      Equinox ICRS
Constellation Scutum
Right ascension 18h 50m 20.03715s
Declination −07° 54′ 27.4270″
Apparent magnitude (V) 6.6 to 7.3
Characteristics
Evolutionary stage AGB
Spectral type C64
Variable type SRb
Astrometry
Radial velocity (Rv)−0.20±1.6 km/s
Proper motion (μ) RA: 7.92 mas/yr
Dec.: −4.55 mas/yr
Parallax (π)2.59±0.57 mas
Distanceapprox. 1,300 ly
(approx. 390 pc)
Details
Mass1.0 M☉
Radius126 R☉
Luminosity8,552 L☉
Temperature3,000 K
Other designations
BD−08°4726, HD 174325, HIP 92442, HR 7089, SAO 142674
Database references
SIMBADdata

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). Its apparent magnitude varies between 6.6 and 7.3, making it not quite bright enough to be seen with the naked eye.

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

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 3 "S Sct". International Variable Star Index. AAVSO. Retrieved 2026-05-19.
  4. ↑ Maercker, M.; De Beck, E.; Khouri, T.; Vlemmings, W. H. T.; Gustafsson, J.; Olofsson, H.; Tafoya, D.; Kerschbaum, F.; Lindqvist, M. (2024). "Probing the dynamical and kinematical structures of detached shells around AGB stars". Astronomy and Astrophysics. 687: A112. arXiv:2405.01222. Bibcode:2024A&A...687A.112M. doi:10.1051/0004-6361/202449643.
  5. 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.
  6. ↑ 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.
  7. 1 2 3 Liberatori, A.; Hatzidimitriou, D.; Antoniadis, K.; Pastorelli, G.; Trabucchi, M.; Groenewegen, M. A. T.; Bossini, D.; Girardi, L.; Marigo, P.; Bressan, A.; Kallimanis, I. N.; Costa, G.; Katsis, V.; Vasilopoulos, G.; Chatzipetros, S. (2026). "A homogeneous view of asymptotic giant branch carbon stars as seen by Gaia". Astronomy and Astrophysics. 708: A120. arXiv:2602.15550. Bibcode:2026A&A...708A.120L. doi:10.1051/0004-6361/202558609.
  8. ↑ Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  9. ↑ 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.
  10. ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C.
  11. 1 2 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.