Sökning: (WFRF:(Curto M)) srt2:(2005-2009) > (2007) > Pulsation in the at...
Fältnamn | Indikatorer | Metadata |
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000 | 03675naa a2200529 4500 | |
001 | oai:DiVA.org:uu-14075 | |
003 | SwePub | |
008 | 080128s2007 | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-140752 URI |
024 | 7 | a https://doi.org/10.1051/0004-6361:200663652 DOI |
040 | a (SwePub)uu | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Ryabchikova, T.4 aut |
245 | 1 0 | a Pulsation in the atmosphere of the roAp star HD 24712 :b I. Spectroscopic observations and radial velocity measurements |
264 | c 2006-11-13 | |
264 | 1 | b EDP Sciences,c 2007 |
338 | a print2 rdacarrier | |
520 | a Aims.We have investigated the structure of the pulsating atmosphere of one of the best studied rapidly oscillating Ap stars, HD 24712.Methods.For this purpose we analyzed spectra collected during 2001-2004. An extensive data set was obtained in 2004 simultaneously with the photometry of the Canadian MOST mini-satellite. This allows us to connect directly atmospheric dynamics observed as radial velocity variations with light variations seen in photometry. Results.We directly derived for the first time and for different chemical elements, respectively ions, phase shifts between photometric and radial velocity pulsation maxima indicating, as we suggest, different line formation depths in the atmosphere. This allowed us to estimate for the first time the propagation velocity of a pulsation wave in the outer stellar atmosphere of a roAp star to be slightly lower than the sound speed. We confirm large pulsation amplitudes (150-400 m s-1) for REE lines and the H core, while spectral lines of the other elements (Mg, Si, Ca, and Fe-peak elements) have nearly constant velocities. We did not find different pulsation amplitudes and phases for the lines of rare-earth elements before and after the Balmer jump, which supports the hypothesis of REE concentration in the upper atmosphere above the hydrogen line-forming layers. We also discuss radial velocity amplitudes and phases measured for individual spectral lines as tools for a 3D tomography of the atmosphere of HD 24712. | |
650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
653 | a stars: atmospheres | |
653 | a stars: chemically peculiar | |
653 | a stars: individual: HD 24712 | |
653 | a stars: magnetic fields | |
653 | a stars: oscillations | |
653 | a Astronomy and astrophysics | |
653 | a Astronomi och astrofysik | |
700 | 1 | a Sachkov, M.4 aut |
700 | 1 | a Weiss, W.W.4 aut |
700 | 1 | a Kallinger, T.4 aut |
700 | 1 | a Kochukhov, Olegu Uppsala universitet,Institutionen för astronomi och rymdfysik4 aut0 (Swepub:uu)oko28508 |
700 | 1 | a Bagnulo, S.4 aut |
700 | 1 | a Ilyin, I.4 aut |
700 | 1 | a Landstreet, J.D.4 aut |
700 | 1 | a Leone, F.4 aut |
700 | 1 | a Lo Curto, G.u Uppsala universitet,Institutionen för astronomi och rymdfysik4 aut |
700 | 1 | a Luftinger, T.4 aut |
700 | 1 | a Lyashko, D.4 aut |
700 | 1 | a Magazzu, A.4 aut |
710 | 2 | a Uppsala universitetb Institutionen för astronomi och rymdfysik4 org |
773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 462:3, s. 1103-1112q 462:3<1103-1112x 0004-6361x 1432-0746 |
856 | 4 | u https://www.aanda.org/articles/aa/pdf/2007/06/aa6365-06.pdf |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-14075 |
856 | 4 8 | u https://doi.org/10.1051/0004-6361:20066365 |
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