Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011hsa6.conf..487m&link_type=abstract
Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held
Astronomy and Astrophysics
Astrophysics
Scientific paper
We report on K-band VLTI/AMBER observations at medium spectral resolution (about 1500) of RS Capricorni, an M6/M7III semi-regular AGB star. From the spectrally-dispersed visibilities, we measure the star diameter as a function of observing wavelength from 2.13 to 2.47 microns. We detect size variations of around 10% in the CO band heads, indicating strong opacity effects of CO in the stellar atmosphere. We also detect a linear increase of the size as a function of wavelength, beginning at 2.29 microns. Models of the stellar atmosphere, based on the mass of the star as estimated from stellar-evolution models, predict CO-size effects about half of those observed, and cannot reproduce the linear size increase with wavelength, for wavelengths longer than 2.29 microns. We are able to model this linear size increase with the addition of an extended water-vapor envelope around the star. We also find evidence of an additional extended CO envelope.
Marcaide Juan Maria
Marti-Vidal Ivan
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