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R Sculptoris

March 14, 2024

R Sculptoris is a variable star system in the southern constellation of Sculptor.[9][10] Parallax measurements provide a distance estimate of approximately 1,435 ± 98 light-years from the Sun.[1] An independent estimate based on measurements of an ejected shell surrounding the star yield a distance of 1,180 ± 140 light-years.[11] The star is drifting closer with a radial velocity of −5.4 km/s.[5]

R Sculptoris
Location of R Sculptoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sculptor
Right ascension 01h 26m 58.09462s[1]
Declination −32° 32′ 35.4377″[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: −9.784[1] mas/yr
Dec.: −30.900[1] mas/yr
Parallax (π)2.2724 ± 0.1471 mas[1]
Distance1,440 ± 90 ly
(440 ± 30 pc)
Absolute magnitude (MV)−0.45[6]
Details[7]
Mass1.3±0.7 M☉
Radius138.61+1.24
−0.16[1] R☉
Luminosity2,068±171[1] L☉
Surface gravity (log g)−0.6±0.4 cgs
Temperature3,306+2
−15[1] K
Metallicity [Fe/H]0.0[3] dex
Other designations
R Scl, CD−33°525, HD 8879, HIP 6759, HR 423, SAO 193122, WDS J01270-3233A, AAVSO 0122-33[8]
Database references
SIMBADdata
A visual band light curve for R Sculptoris, plotted from ASAS data[12]

This is an aging giant star on the asymptotic giant branch with a stellar classification of C6,5ea(Np),[3] which indicates a carbon-rich atmosphere. It is a semi-regular pulsating star of the SRb[4] type that is nearing the end of its fusing lifespan. A sine curve fitted to the last ten pulsation cycles prior to 2017 give a pulsation period of 376 days with an amplitude of 0.75 magnitude. The star is shedding its outer atmosphere, and it is surrounded by a thin shell of dust and gas that was created during the most recent thermal pulse around 2,000 years ago.[11]

Observations have revealed a spiral structure in the material around the star.[13] The spiral is suspected to be caused by an unseen companion star.[9] The spiral windings are consistent with an orbital period of ~350 years.[13]

Gallery edit

  •  
    This image captures approximately 20x20 milliarcseconds.[14]
  •  
    Spiral spotted by ALMA around the star (data visualisation).
  •  
    R Sculptoris and its hidden companion, taken by Hubble Space Telescope

References edit

  1. ^ a b c d e f g h i 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.
  2. ^ a b c 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. ^ a b c Cruzalèbes, P.; et al. (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 (1): 437. arXiv:1306.3288. Bibcode:2013MNRAS.434..437C. doi:10.1093/mnras/stt1037. S2CID 49573767.
  4. ^ a b Samus, N. N.; et al. (2009). "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. ^ a b 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.
  6. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644
  7. ^ Wittkowski, M; et al. (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. S2CID 56160169.
  8. ^ "R Scl". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-06.
  9. ^ a b "Hubble Gazes at R Sculptoris and its Hidden Companion". SpaceDaily. 11 January 2015.
  10. ^ "Curious spiral spotted by ALMA around red giant star R Sculptoris (data visualisation)". Image Archive. ESO. Retrieved 11 October 2012.
  11. ^ a b Maercker, M.; et al. (April 2018). "An independent distance estimate to the AGB star R Sculptoris". Astronomy & Astrophysics. 611: 8. arXiv:1711.09676. Bibcode:2018A&A...611A.102M. doi:10.1051/0004-6361/201732057. S2CID 56318815. A102.
  12. ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
  13. ^ a b Maercker, M.; et al. (2012). "Unexpectedly large mass loss during the thermal pulse cycle of the red giant star R Sculptoris". Nature. 490 (7419): 232–4. arXiv:1210.3030. Bibcode:2012Natur.490..232M. doi:10.1038/nature11511. PMID 23060194. S2CID 4417744.
  14. ^ "A red giant sheds its skin". www.eso.org. Retrieved 12 February 2018.

Further reading edit

  • Nola Taylor Redd (October 11, 2012). "Strange Star Spiral Offers Clues to Sun's Fate". SPACE.com. Scientific American. Retrieved 31 October 2012.

March 14, 2024
sculptoris, variable, star, system, southern, constellation, sculptor, parallax, measurements, provide, distance, estimate, approximately, light, years, from, independent, estimate, based, measurements, ejected, shell, surrounding, star, yield, distance, light. R Sculptoris is a variable star system in the southern constellation of Sculptor 9 10 Parallax measurements provide a distance estimate of approximately 1 435 98 light years from the Sun 1 An independent estimate based on measurements of an ejected shell surrounding the star yield a distance of 1 180 140 light years 11 The star is drifting closer with a radial velocity of 5 4 km s 5 R SculptorisLocation of R Sculptoris circled Observation dataEpoch J2000 0 Equinox J2000 0Constellation SculptorRight ascension 01h 26m 58 09462s 1 Declination 32 32 35 4377 1 Apparent magnitude V 5 72 2 CharacteristicsSpectral type C6 5ea Np 3 U B color index 7 67 2 B V color index 3 87 2 Variable type SRb 4 AstrometryRadial velocity Rv 5 40 5 km sProper motion m RA 9 784 1 mas yr Dec 30 900 1 mas yrParallax p 2 2724 0 1471 mas 1 Distance1 440 90 ly 440 30 pc Absolute magnitude MV 0 45 6 Details 7 Mass1 3 0 7 M Radius138 61 1 24 0 16 1 R Luminosity2 068 171 1 L Surface gravity log g 0 6 0 4 cgsTemperature3 306 2 15 1 KMetallicity Fe H 0 0 3 dexOther designationsR Scl CD 33 525 HD 8879 HIP 6759 HR 423 SAO 193122 WDS J01270 3233A AAVSO 0122 33 8 Database referencesSIMBADdata A visual band light curve for R Sculptoris plotted from ASAS data 12 This is an aging giant star on the asymptotic giant branch with a stellar classification of C6 5ea Np 3 which indicates a carbon rich atmosphere It is a semi regular pulsating star of the SRb 4 type that is nearing the end of its fusing lifespan A sine curve fitted to the last ten pulsation cycles prior to 2017 give a pulsation period of 376 days with an amplitude of 0 75 magnitude The star is shedding its outer atmosphere and it is surrounded by a thin shell of dust and gas that was created during the most recent thermal pulse around 2 000 years ago 11 Observations have revealed a spiral structure in the material around the star 13 The spiral is suspected to be caused by an unseen companion star 9 The spiral windings are consistent with an orbital period of 350 years 13 Gallery edit nbsp This image captures approximately 20x20 milliarcseconds 14 nbsp Spiral spotted by ALMA around the star data visualisation nbsp R Sculptoris and its hidden companion taken by Hubble Space TelescopeReferences edit a b c d e f g h i Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR a b c 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 a b c Cruzalebes P et al 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 1 437 arXiv 1306 3288 Bibcode 2013MNRAS 434 437C doi 10 1093 mnras stt1037 S2CID 49573767 a b Samus N N et al 2009 General Catalogue of Variable Stars Samus 2007 2013 VizieR On line Data Catalog B GCVS Originally Published in 2009yCat 102025S 1 Bibcode 2009yCat 102025S a b 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 Anderson E Francis Ch 2012 XHIP An extended hipparcos compilation Astronomy Letters 38 5 331 arXiv 1108 4971 Bibcode 2012AstL 38 331A doi 10 1134 S1063773712050015 S2CID 119257644 Wittkowski M et al 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 amp Astrophysics 601 A3 arXiv 1702 02574 Bibcode 2017A amp A 601A 3W doi 10 1051 0004 6361 201630214 S2CID 56160169 R Scl SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2020 12 06 a b Hubble Gazes at R Sculptoris and its Hidden Companion SpaceDaily 11 January 2015 Curious spiral spotted by ALMA around red giant star R Sculptoris data visualisation Image Archive ESO Retrieved 11 October 2012 a b Maercker M et al April 2018 An independent distance estimate to the AGB star R Sculptoris Astronomy amp Astrophysics 611 8 arXiv 1711 09676 Bibcode 2018A amp A 611A 102M doi 10 1051 0004 6361 201732057 S2CID 56318815 A102 ASAS All Star Catalogue The All Sky Automated Survey Retrieved 8 December 2021 a b Maercker M et al 2012 Unexpectedly large mass loss during the thermal pulse cycle of the red giant star R Sculptoris Nature 490 7419 232 4 arXiv 1210 3030 Bibcode 2012Natur 490 232M doi 10 1038 nature11511 PMID 23060194 S2CID 4417744 A red giant sheds its skin www eso org Retrieved 12 February 2018 Further reading editNola Taylor Redd October 11 2012 Strange Star Spiral Offers Clues to Sun s Fate SPACE com Scientific American Retrieved 31 October 2012 Retrieved from https en wikipedia org w index php title R Sculptoris amp oldid 1079511358, wikipedia, wiki, book, books, library,

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