Simultaneous photometry and spectroscopy of the newly discovered γ Doradus variable HR 8330=HD 207223 |
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| Authors: | Anthony B Kaye Gregory W Henry Francis C Fekel Douglas S Hall |
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| Institution: | Los Alamos National Laboratory, X-TA, MS B-220, Los Alamos, NM 87545, USA; Center of Excellence in Information Systems, Tennessee State University, 330 10th Ave. North, Nashville, TN 37203, USA; Dyer Observatory, Vanderbilt University, 1000 Oman Drive, Brentwood, TN 37027, USA |
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| Abstract: | We present BV photometry and simultaneous high-resolution, high signal-to-noise ratio spectroscopy of the newly-discovered γ Doradus variable HR 8330 taken during the 1997 and 1998 observing seasons. We calculate power spectra for the B - and V -band data sets and for the time series defined throughout the observing season at each point across the Fe ii λ 4508.289 and the Ti ii λ 4501.278 line profiles to search for periodic variability. Period analysis reveals a single, 2.6-d period in both the photometric and the spectroscopic data, with a 237° phase lag between them. Based on the location of HR 8330 in the HR diagram and the characteristics of its photometric and spectroscopic variations, we conclude that HR 8330 is a bona fide γ Doradus-type pulsating variable. |
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| Keywords: | stars: activity stars: individual: HR 8330 stars: oscillations stars: variables: other |
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