Spectroscopic study of pulsations in the atmosphere of roAp star 10 Aql
- Author(s)
- Michail Sachkov, Oleg Kochukhov, Tatiana A. Ryabchikova, Francesco Leone, Stefano Bagnulo, Werner Wolfgang Weiss
- Abstract
We present the analysis of spectroscopic time-series observations of the roAp star 10 Aql. Observations were carried out in July 2006 with the UVES and SARG spectrographs and simultaneously with the MOST mini-satellite photometry. All these data were analysed for radial velocity (RV) variations. About 150 lines out of the 1000 measured reveal a clear pulsation signal. Frequency analysis of the spectroscopic data gives three frequencies that coincide with the photometric ones. Phase-amplitude diagrams created for the lines of different elements/ions show that atmospheric pulsations may be represented by a superposition of standing and running wave components, similar to other roAp stars. The highest RV amplitudes, 300 - 400 m/s, were measured for Ce II, Dy III, Tb III, and two unidentified lines at 5471, 5556Å.
We discovered a ?0.4 period phase jump in the RV measurements across the Nd III line profiles, indicating the presence of the pulsation node in stellar atmospheres. The phase jump occurs at nearly the same atmospheric layer for the two main frequencies. There is no rotational modulation in the average spectra for the 6 different nights we analysed.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Russian Academy of Sciences, Uppsala University, University of Vienna, Università degli Studi di Catania, Armagh Observatory
- Journal
- Contributions of the Astronomical Observatory Skalnaté Pleso
- Volume
- 38
- Pages
- 323-328
- No. of pages
- 6
- ISSN
- 1335-1842
- Publication date
- 2008
- Austrian Fields of Science 2012
- 1030 Physics, Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/737eb496-744f-4a84-bfb5-b9cca6852fe6