R Sculptoris

R Sculptoris is an asymptotic giant branch semi-regular variable red giant star located 1,500 light-years (460 parsecs) away from Earth in the constellation of Sculptor.[8][9] Observations have revealed a spiral structure in the material around it.[10] The spiral is suspected to be caused by an unseen companion star.[8] It is 1,440 ± 90 light-years distant from Earth.[6]

R Sculptoris
Location of R Sculptoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sculptor
Right ascension  01h 26m 58.09492s[1]
Declination −32° 32′ 35.4374″[1]
Apparent magnitude (V) +5.72[2]
Characteristics
Spectral type C6,5ea(Np)[3]
U−B color index +7.67[2]
B−V color index +3.87[2]
Variable type SRb[4]
Astrometry
Radial velocity (Rv)−5.40[5] km/s
Proper motion (μ) RA: −7.63 ± 0.69[1] mas/yr
Dec.: −31.48 ± 0.46[1] mas/yr
Parallax (π)2.2724 ± 0.1471[6] mas
Distance1,440 ± 90 ly
(440 ± 30 pc)
Details
Mass1.3 ± 0.7[7] M☉
Radius355 ± 55[7] R☉
Luminosity5495+2823
−1864[7] L☉
Surface gravity (log g)−0.6 ± 0.4[7] cgs
Temperature2,640 ± 80[7] K
Other designations
R Scl, CD−33° 525, HD 8879, HR 423, HIP 6759, AAVSO 0122-33
Database references
SIMBADdata
  • This image captures approximately 20x20 milliarcseconds.[11]
  • Spiral spotted by ALMA around the star (data visualisation).
  • R Sculptoris and its hidden companion, taken by Hubble Space Telescope

References
  1. van Leeuwen, F. (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.Vizier catalog entry
  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: 0. Bibcode:2002yCat.2237....0D.
  3. Cruzalèbes, P.; Jorissen, A.; Rabbia, Y.; Sacuto, S.; Chiavassa, A.; Pasquato, E.; Plez, B.; Eriksson, K.; Spang, A.; Chesneau, O. (2013). "Fundamental parameters of 16 late-type stars derived from their angular diameter measured with VLTI/AMBER". Monthly Notices of the Royal Astronomical Society. 434: 437. arXiv:1306.3288. Bibcode:2013MNRAS.434..437C. doi:10.1093/mnras/stt1037.
  4. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. 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.
  7. Wittkowski, M; Hofmann, K.-H; Höfner, S; Le Bouquin, J. B; Nowotny, W; Paladini, C; Young, J; Berger, J.-P; Brunner, M; De Gregorio-Monsalvo, I; Eriksson, K; Hron, J; Humphreys, E. M. L; Lindqvist, M; Maercker, M; Mohamed, S; Olofsson, H; Ramstedt, S; Weigelt, G (2017). "Aperture synthesis imaging of the carbon AGB star R Sculptoris. Detection of a complex structure and a dominating spot on the stellar disk". Astronomy & Astrophysics. 601: A3. arXiv:1702.02574. Bibcode:2017A&A...601A...3W. doi:10.1051/0004-6361/201630214.
  8. "Hubble Gazes at R Sculptoris and its Hidden Companion". SpaceDaily. 11 January 2015.
  9. "Curious spiral spotted by ALMA around red giant star R Sculptoris (data visualisation)". Image Archive. ESO. Retrieved 11 October 2012.
  10. Maercker, M; Mohamed, S; Vlemmings, W. H. T; Ramstedt, S; Groenewegen, M. A. T; Humphreys, E; Kerschbaum, F; Lindqvist, M; Olofsson, H; Paladini, C; Wittkowski, M; De Gregorio-Monsalvo, I; Nyman, L.-A (2012). "Unexpectedly large mass loss during the thermal pulse cycle of the red giant star R Sculptoris". Nature. 490 (7419): 232. arXiv:1210.3030. Bibcode:2012Natur.490..232M. doi:10.1038/nature11511. PMID 23060194.
  11. "A red giant sheds its skin". www.eso.org. Retrieved 12 February 2018.

Further reading



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