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
gollark: You can leave the US, you at least... can say bad things about the government a bit, you can... have weapons, you're less likely to be randomly imprisoned, sort of thing.
gollark: ... *really*?
gollark: ... North Korea did, presumably?
gollark: Instead of getting disappeared for complaining or whatever.
gollark: I would be mildly less unhappy with authoritarian countries if they actually would let you leave.

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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