Journal Article

Values of <i>v</i> sin <i>i</i> for late-type stars from spectral synthesis in the <i>K</i>-band region

Yuri Lyubchik, Hugh R. A. Jones, Yakiv V. Pavlenko, David J. Pinfield and Kevin R. Covey

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 3, pages 2195-2201
Published in print May 2012 | ISSN: 0035-8711
Published online May 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20762.x
Values of v sin i for late-type stars from spectral synthesis in the K-band region

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We analyse medium-resolution spectra (R∼ 18 000) of 19 late type dwarfs in order to determine v sin i values using synthetic rather than observational template spectra. For this purpose, observational data around 2.2 μm for stars with spectral classes from G8V to M9.5V were modelled. We find that the Na i (2.2062- and 2.2090-μm) and 12CO 2–0 band features are modelled well enough to use for v sin i determination without the need for suitable observational template spectra. Within the limit of the resolution of our spectra, we use synthetic spectra templates to derive v sin i values consistent with those derived in the optical regime using observed templates. We quantify the errors in our v sin i determination due to incorrect choice of model parameters Teff, log g, vmicro, [Fe/H] or full width at half-maximum and show that they are typically less than 10 percent. We note that the spectral resolution of our data (∼16 km s−1) limited this study to relatively fast rotators and that a resolution of 60 000 will be required to access most late-type dwarfs.

Keywords: atomic data; molecular data; stars: late-type

Journal Article.  3794 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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