Antarctica photometry of the Blazhko RR Lyrae star S Arae
We pursue the study of S Arae, an RRab Lyrae Blazho star, using unique, uninterrupted and accurate optical photometric data acquired from Antarctica at Dome C by PAIX – Photometer AntarctIca eXtraction – during 150 d. The PAIX data were analysed using both Period04 and PDM13. Besides a main pulsatio...
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fthighwire:oai:open-archive.highwire.org:mnras:456/1/192 2023-05-15T13:56:50+02:00 Antarctica photometry of the Blazhko RR Lyrae star S Arae Zalian, C. Chadid, M. Vernin, J. Abe, L. Agabi, A. 2015-12-14 05:35:59.0 text/html http://mnras.oxfordjournals.org/cgi/content/short/456/1/192 https://doi.org/10.1093/mnras/stv2611 en eng Oxford University Press http://mnras.oxfordjournals.org/cgi/content/short/456/1/192 http://dx.doi.org/10.1093/mnras/stv2611 Copyright (C) 2015, Oxford University Press Article TEXT 2015 fthighwire https://doi.org/10.1093/mnras/stv2611 2016-11-16T17:34:24Z We pursue the study of S Arae, an RRab Lyrae Blazho star, using unique, uninterrupted and accurate optical photometric data acquired from Antarctica at Dome C by PAIX – Photometer AntarctIca eXtraction – during 150 d. The PAIX data were analysed using both Period04 and PDM13. Besides a main pulsation period of 0.452 d and a modulation period of 47.264 d, three other significant frequencies were found. Multiplet patterns, up to the ninth order, were also extracted, showing a clear asymmetric structure. Following these results, a new approximation of the main-frequency harmonics amplitude decrease is suggested, replacing the usual exponential fit by a hyperbolic one. The physical properties of the Blazhko star, namely metallicity, temperature, mass, were obtained using a new approach based on the study of these parameters for each Blazhko phase. Finally, the PAIX data reveal a residual scatter that occurs during a small phase interval, 10 per cent of the pulsation period, corresponding to the phase of the main shock passage across the atmosphere. The position of the so-called main bump, corresponding to the shock resulting from the infalling atmosphere and the expanding photosphere, varies from one cycle to another and, moreover, around this main bump, two other bumps appear and vanish at different phases during a Blazhko cycle. Following these observations, we discuss the relation between the bump topology and the Blazhko period and give new insights for future Blazhko theoretical investigations. Text Antarc* Antarctica HighWire Press (Stanford University) The Bump ENVELOPE(-36.767,-36.767,-54.100,-54.100) Monthly Notices of the Royal Astronomical Society 456 1 192 206 |
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Article Zalian, C. Chadid, M. Vernin, J. Abe, L. Agabi, A. Antarctica photometry of the Blazhko RR Lyrae star S Arae |
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Article |
description |
We pursue the study of S Arae, an RRab Lyrae Blazho star, using unique, uninterrupted and accurate optical photometric data acquired from Antarctica at Dome C by PAIX – Photometer AntarctIca eXtraction – during 150 d. The PAIX data were analysed using both Period04 and PDM13. Besides a main pulsation period of 0.452 d and a modulation period of 47.264 d, three other significant frequencies were found. Multiplet patterns, up to the ninth order, were also extracted, showing a clear asymmetric structure. Following these results, a new approximation of the main-frequency harmonics amplitude decrease is suggested, replacing the usual exponential fit by a hyperbolic one. The physical properties of the Blazhko star, namely metallicity, temperature, mass, were obtained using a new approach based on the study of these parameters for each Blazhko phase. Finally, the PAIX data reveal a residual scatter that occurs during a small phase interval, 10 per cent of the pulsation period, corresponding to the phase of the main shock passage across the atmosphere. The position of the so-called main bump, corresponding to the shock resulting from the infalling atmosphere and the expanding photosphere, varies from one cycle to another and, moreover, around this main bump, two other bumps appear and vanish at different phases during a Blazhko cycle. Following these observations, we discuss the relation between the bump topology and the Blazhko period and give new insights for future Blazhko theoretical investigations. |
format |
Text |
author |
Zalian, C. Chadid, M. Vernin, J. Abe, L. Agabi, A. |
author_facet |
Zalian, C. Chadid, M. Vernin, J. Abe, L. Agabi, A. |
author_sort |
Zalian, C. |
title |
Antarctica photometry of the Blazhko RR Lyrae star S Arae |
title_short |
Antarctica photometry of the Blazhko RR Lyrae star S Arae |
title_full |
Antarctica photometry of the Blazhko RR Lyrae star S Arae |
title_fullStr |
Antarctica photometry of the Blazhko RR Lyrae star S Arae |
title_full_unstemmed |
Antarctica photometry of the Blazhko RR Lyrae star S Arae |
title_sort |
antarctica photometry of the blazhko rr lyrae star s arae |
publisher |
Oxford University Press |
publishDate |
2015 |
url |
http://mnras.oxfordjournals.org/cgi/content/short/456/1/192 https://doi.org/10.1093/mnras/stv2611 |
long_lat |
ENVELOPE(-36.767,-36.767,-54.100,-54.100) |
geographic |
The Bump |
geographic_facet |
The Bump |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
http://mnras.oxfordjournals.org/cgi/content/short/456/1/192 http://dx.doi.org/10.1093/mnras/stv2611 |
op_rights |
Copyright (C) 2015, Oxford University Press |
op_doi |
https://doi.org/10.1093/mnras/stv2611 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
456 |
container_issue |
1 |
container_start_page |
192 |
op_container_end_page |
206 |
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1766264411362689024 |