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Paper: Time Resolved Spectroscopy of Balloon 090100001: Observations and Modelling of Variations in Atmospheric Parameters
Volume: 392, Hot Subdwarf Stars and Related Objects
Page: 301
Authors: Østensen, R.H.; Telting, J.H.; Heber, U.; Jeffery, C.S.
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 R, which corresponds to a total mass of 0.443 M 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.
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