Surface spots on cool giants probed by spectro-astrometry

Details Surface spots on cool giants probed by spectro-astrometry Surface spots on cool giants probed by spectro-astrometry

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..896v&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Astronomy and Astrophysics

Astronomy

Giant And Subgiant Stars, Stellar Activity, Star Formation

Scientific paper

Spectro-astrometry enables us to study phenomena on milli-arcsecond spatial scales. It exploits the variation with wavelength of the centroid position of a structured source in a longslit spectrum, predominantly near spectral absorption/emission lines. The centroid can be measured with sub-diffration-limited precision, depending mostly on the S/N. Our goal is to identify surface features on cool giant stars and to constrain their size and temperature constrast. We obtained VLT/CRIRES 2.3 um-CO-spectra (R~90000 S/N~1000-5000) of TW Oph and RS Vir. We find spectro-astrometric signatures at a 2 mas amplitude for TW Oph. The best-fitting models suggest a mid-lattitude spot covering 10% of the visible stellar disk with ΔT~500 K. In the case of RS Vir, we derive upper limits on spot coverage.

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