Radial velocity pulsations in the atmosphere of the roAp star HD 24712

Details Radial velocity pulsations in the atmosphere of the roAp star HD 24712 Radial velocity pulsations in the atmosphere of the roAp star HD 24712

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..224..770s&link_type=abstract

The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004. Edited by J. Zverko, J. Ziznovsky, S.J. Adelman, and W.W. Weiss,

Physics

4

Stars: Chemically Peculiar, Stars: Atmospheres, Stars: Individual: (Hd 24712), Techniques: Radial Velocities, Techniques: Spectroscopic.

Scientific paper

We present results of the analysis of spectroscopic time-series observations of the roAp star HD 24712 obtained at the phase of magnetic maximum. As in previous investigations of roAp stars we found that only lines of the rare-earth elements (REE) show RV pulsational variations. These pulsations in HD 24712 are characterised by gradual phase shifts between RV curves of different REE. The same pulsations of HD 24712 were observed in 2001, giving strong evidence for the stability of the pulsational mechanism in this star. NLTE calculations of Nd line depth formation in stratified atmosphere of HD 24712 allowed us to study the pulsational phase distribution with optical depth, providing strong evidence for a running wave, propagating outward with nearly constant RV amplitude.

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