CAOSP abstracts, Volume: 27, No.: 3, year: 1998
- Author(s): HATZES, A.P.; KANAAN, A.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 27, no. 3, p. 347-349.
- Date: 04/1998
- Title: Radial velocity studies of roAp stars
- Keyword(s): STARS: OSCILLATIONS, TECHNIQUES: RADIAL VELOCITIES
- Pages: 347 -- 349
We present recent results from our radial velocity (RV) studies of
rapidly oscillating Ap (roAp) stars. Our measurements reveal that the
pulsational amplitude of these stars depends on the spectral region that
is examined. For one star, gamma Equ, the pulsational RV amplitude depends
on both line strength and atomic species. The elemental difference is most
likely related to the abundance patches on the surface of these stars.
The line strength difference is interpreted as arising form a height effect
in the atmosphere. Ultimately, these measurements may provide valuable
diagnostics of the atmospheres of these stars.
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