2-microns CO overtone absorption in young stellar objects

Astronomy and Astrophysics – Astronomy

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Infrared Stars, Interstellar Matter, Pre-Main Sequence Stars, Star Formation, Stellar Evolution, Black Body Radiation, Carbon Monoxide, Early Stars, Luminous Intensity, T Tauri Stars

Scientific paper

CO-12 overtone absorption bands have been detected in five of 10 low-luminosity YSOs studied in the Ophiuchus cloud core. The majority of those showing absorption have class II spectral energy distributions. The majority of the class I objects show no spectral features at all. If the bands are assumed to be photospheric in origin, then the results can be understood as a decrease in veiling by an IR continuum excess as the sources evolve from class I to class II.

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