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Radial Velocity Studies of roAp stars: Rotational Modulation in HR 12171

Published online by Cambridge University Press:  12 April 2016

A.P. Hatzes ,
D. Mkrtichian  and
A. Kanaan
A.P. Hatzes
Affiliation:
Thüringer Landessternwarte Tautenburg, Germany
D. Mkrtichian
Affiliation:
Astronomical Observatory, Odessa, Ukraine
A. Kanaan
Affiliation:
Departamento de Física, Universidade Federal de Santa Caterina, Brazil

Abstract

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We present the preliminary results of our analysis of the precise radial velocity (RV) measurements of the roAp star HR1217. We have obtained over 2000 spectra of this star (54 hours of coverage) covering a complete rotation period using the 2-d coude echelle spectrograph of the McDonald Observatory’s 2.7m telescope. Our RV data show rotational modulation in both the amplitude and phase of the pulsations. The broad-band (covering 110 Å) RV semi-amplitudes of the f2 mode (=2.65 mHz) varied in the range of 25 m s–1 to 200 m s–1.

Type
Part 2.3. Chemically Peculiar Stars
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 300 - 301
Copyright
Copyright © Astronomical Society of the Pacific 2002

Footnotes

1

This work is based on data taken at McDonald Observatory

References

1 This work is based on data taken at McDonald Observatory