Spectroscopy of the variable K-dwarf UNSW-V-760: is it a pre-main-sequence pulsator?

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Date

2013

Journal Title

Journal ISSN

Volume Title

Publisher

Oxford University Press

Abstract

The star UNSW-V-760 is a known variable, showing both flares and two non-sinusoidal periodicities. Availability of high signal-to-noise spectra reported in this paper has enabled a revision of the spectral type of this star to K3 IV-Vk. The star is a very rapid rotator (v sin i āˆ¼ 140 km sāˆ’1), and the abundance of lithium appears to be enhanced. 48 radial velocity measurements were obtained over the course of three successive nights. These may show the same two frequencies detected photometrically, but there is some uncertainty in the interpretation. Application of pulsation theory suggests that photometric frequencies could be explained as low pulsation modes, but an excitation mechanism remains to be found.

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Keywords

Stars, Individual, UNSW-V-760 ā€“ stars, Pre-main-sequence ā€“ stars, Variables

Citation

Koen, C. et al. (2013). Spectroscopy of the variable K-dwarf UNSW-V-760: is it a pre-main-sequence pulsator? Monthly Notices of the Royal Astronomical Society, 435: 2494ā€“2500