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

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    Koen_Spectroscopy of the _2013_.pdf (1.154Mb)
    Date
    2013
    Author
    Koen, Chris
    Gray, Richard O.
    Kawaler, S.
    Crawford, S. M.
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    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 ∼ 140 km s−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.
    URI
    http://hdl.handle.net/10566/3060
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    • Research Articles (Statistics & Population Studies) [112]

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