Analysis of the Impact of the Blazhko Effect Both on the Van Hoof Effect and Radial Velocity Amplitude in the Star RR Lyr

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外文摘要：The Van Hoof effect is a phase shift existing between the radial velocity curves of hydrogen and metallic lines within the atmosphere of pulsating stars.In this article,we present a study of this phenomenon through the spectra of the brightest pulsating star RR Lyr of RR Lyrae stars recorded for 22 yr.We based ourselves,on the one hand,on 1268 spectra(41 nights of observation)recorded between the years 1994 and 1997 at the Observatory of Haute Provence(OHP,France)previously observed by Chadid and Gillet,and on the other hand on 1569 spectra(46 nights of observation)recorded at our Oukaimeden Observatory(Morocco)between 2015 and 2016.Through this study,we have detected information on atmospheric dynamics that had not previously been detected.Indeed,the Van Hoof effect which results in a clear correlation between the radial velocities of hydrogen and those of the metallic lines has been observed and analyzed at different Blazhko phases.A correlation between the radial velocities of different metallic lines located in the lower atmosphere has been observed as well.For the first time,we were able to show that the amplitude of the radial velocity curves deduced from the lines of hydrogen and that of Fe n(λ4923.921 Å)increases toward the minimum of the Blazhko cycle and decreases toward the maximum of the same Blazhko cycle.Furthermore,we found that the Van Hoof effect is also modulated by the Blazhko effect.Thus,toward the minimum of the Blazhko cycle the Van Hoof effect is more visible and at the maximum of the Blazhko cycle,this effect is minimal.We also observed the temporal evolution of the amplitudes of the radial velocities of the lower and upper atmosphere.When observed over a long time,we can interpret it as a function of the Blazhko phases.

外文关键词：

stars:atmospheresstars:variables:RR Lyraeshock wavestechniques:spectroscopictechniques:radial velocitiesstars:individual(RR Lyr)

作者：

Y.El jariri、F.L.Sefyani、A.Benhida、Z.Benkhaldoun、K.Kolenberg、K.Chafouai、A.Habib、M.Sabil

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作者单位：

Observatoire de l'Oukaimeden,LPHEA,FSSM,Université Cadi Ayyad,Marrakech,2390,Morocco

Observatoire de l'Oukaimeden,LPHEA,FSTG,Université Cadi Ayyad,Marrakech,549,Morocco

Département de physique,Université d'Anvers Avenue Groenenborger 171,Anvers,2020,Belgium

LICPM,ENSA-BM,Université Sultan Moulay Slimane,Beni-Mellal,23020,Morocco

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出版年：

2024

DOI：

10.1088/1674-4527/ad44f0

天文和天体物理学研究

中国科学院国家天文台

天文和天体物理学研究

CSTPCD

影响因子：0.406

ISSN：1674-4527

年,卷(期)：2024.24(6)