The pulsating λ Bootis star HD 105759 |
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| Authors: | Peter Martinez,,C. Koen,,G. Handler,& E. Paunzen |
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| Affiliation: | South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa,;Institut fu¨r Astronomie der Universita¨t Wien, Tu¨rkenschanzstr. 17, A-1180 Wien, Austria |
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| Abstract: | We present spectroscopic and multisite time series photometric observations of the star HD 105759 which confirm that this is a new pulsating λ Bootis star. Our spectroscopy indicates an overall metallicity of [Z] = log Z − log Z⊙ = −1 and that T eff = 8000 ± 300 K and log g = 4.0 ± 0.2. The photometric data reveal that this star pulsates with at least five frequencies: 8.62, 12.69, 20.15, 21.27 and 23.66 d−1. These frequencies do not all match those found in an earlier single-site study, indicating that the pulsation spectrum changes with time. |
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| Keywords: | stars: chemically peculiar stars: individual: HD 105759 stars: oscillations stars: variables: other |
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