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Title: Time Resolved Spectroscopy of Balloon 090100001: Observations and Modelling of Variations in Atmospheric Parameters
Authors: Ostensen, Roy
Telting, J H
Heber, U
Jeffery, C S
Issue Date: 2008
Publisher: Published by the University of Chicago Press for the Astronomical Society of the Pacific
Host Document: Publications of the Astronomical Society of the Pacific vol:392 pages:301-308
Conference: Hot Subdwarf Stars and Related Objects edition:3 location:Bamberg date:23-27 July 2007
Article number: 2008ASPC..392..301O
Abstract: We present results from analysis of low-resolution time-series spectroscopy of Balloon 090100001, obtained with the Nordic Optical Telescope in August/September 2004. Variations in surface parameters for the four strongest pulsation periods are investigated by phase folding and fitting to model spectra. A detailed analysis of the dominant mode, together with modelling of the projection factors for a range of different modes, shows that only a radial mode is consistent with the observed velocity and gravity variations. We calculate a pulsational radius of 0.213 Rȯ, which corresponds to a total mass of 0.443 Mȯ for the observed mean surface gravity. We warn that these derivations are very sensitive to the accuracy of the radial velocity and gravity variation measurements.
ISBN: 978-1-58381-654-7
ISSN: 0004-6280
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Institute of Astronomy

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