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Article: Multiwavelength observations of RV Tauri stars III. R Scuti

TitleMultiwavelength observations of RV Tauri stars III. R Scuti
Authors
Issue Date1-Jul-1994
PublisherHans Publishers
Citation
Astronomy and Astrophysics, 1994, v. 287, n. 3, p. 866-880 How to Cite?
AbstractWe present ultraviolet, optical and infrared observations of the RV Tauri star R Sct. We argue that changes in the ultraviolet spectrum with pulsational phase cannot be due to changes in effective temperature and gravity alone, and that variable circumstellar extinction in the form of Rayleigh scattering is also necessary. The intrinsic ultraviolet spectra can then be used to determine the spectral type as a function of light curve phase. We find UV spectral types in the range GO-K2, consistent with optical spectra and with the fitting of model atmospheres to ultraviolet-optical-infrared data. Changes in the angular diameter of R Sct with pulsational phase suggest that it undergoes non-radial pulsations. Furthermore, we find no evidence for changes in the stellar parameters during long-term light variations, implying that the cause of these variations must lie outside the star. The Rayleigh scattering seems to be due to very small grains in the environment of R Sct; such a conclusion is consistent with the result that Mg II emission seems to be due to atmospheric shocks rather than chromospheric activity, the shocks inhibiting the formation of large grains in the circumstellar shell of R Sct.
Persistent Identifierhttp://hdl.handle.net/10722/343590
ISSN
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorShenton, M-
dc.contributor.authorMonier, R-
dc.contributor.authorEvans, A-
dc.contributor.authorCarter, B-
dc.contributor.authorLloyd, Evans T-
dc.contributor.authorMarang, F-
dc.contributor.authorParker, Q-
dc.contributor.authorRawlings, J-
dc.contributor.authorScott, A-
dc.contributor.authorVan Wyk, F-
dc.date.accessioned2024-05-24T04:12:16Z-
dc.date.available2024-05-24T04:12:16Z-
dc.date.issued1994-07-01-
dc.identifier.citationAstronomy and Astrophysics, 1994, v. 287, n. 3, p. 866-880-
dc.identifier.issn2329-1273-
dc.identifier.urihttp://hdl.handle.net/10722/343590-
dc.description.abstractWe present ultraviolet, optical and infrared observations of the RV Tauri star R Sct. We argue that changes in the ultraviolet spectrum with pulsational phase cannot be due to changes in effective temperature and gravity alone, and that variable circumstellar extinction in the form of Rayleigh scattering is also necessary. The intrinsic ultraviolet spectra can then be used to determine the spectral type as a function of light curve phase. We find UV spectral types in the range GO-K2, consistent with optical spectra and with the fitting of model atmospheres to ultraviolet-optical-infrared data. Changes in the angular diameter of R Sct with pulsational phase suggest that it undergoes non-radial pulsations. Furthermore, we find no evidence for changes in the stellar parameters during long-term light variations, implying that the cause of these variations must lie outside the star. The Rayleigh scattering seems to be due to very small grains in the environment of R Sct; such a conclusion is consistent with the result that Mg II emission seems to be due to atmospheric shocks rather than chromospheric activity, the shocks inhibiting the formation of large grains in the circumstellar shell of R Sct.-
dc.languageeng-
dc.publisherHans Publishers-
dc.relation.ispartofAstronomy and Astrophysics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleMultiwavelength observations of RV Tauri stars III. R Scuti-
dc.typeArticle-
dc.identifier.volume287-
dc.identifier.issue3-
dc.identifier.spage866-
dc.identifier.epage880-
dc.identifier.eissn2329-1265-
dc.identifier.isiWOS:A1994NX97700021-
dc.publisher.placeLES ULIS CEDEX A-
dc.identifier.issnl2329-1265-

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