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S Scuti

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S Scuti

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) 6.6 to 7.3[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type C64[5]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)−0.20±1.6[6] 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]
Distanceapprox. 1,300 ly
(approx. 390 pc)
Details
Mass1.0[7] M☉
Radius126[8] R☉
Luminosity8,552[7] L☉
Temperature3,000[7] 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).[2] Its apparent magnitude varies between 6.6 and 7.3,[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.[9] It was listed with its variable star designation, S Scuti, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars.[10] S Scuti is a semiregular variable star. Its class is SRb, and its pulsation cycle lasts 148 days.[5] S Scuti is also surrounded by a roughly spherical shell of dust. The shell was known earlier from its carbon monoxide emission lines.[11] The total mass of the dust is (7±2)×10−5 M☉.[11]

References

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  1. ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  2. ^ a b c d e f 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. ^ a b c "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. ^ a b 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. ^ a b c 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. ^ a b 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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