Poster Open Access

Early Results from SOFIA/EXES High Resolution Spectroscopic Observations of Circumstellar Envelopes of AGB Stars

Edward J. Montiel; J. P. Fonfría; M. J. Richter; C. N. DeWitt; J. Cernicharo

We present early results from our project to investigate if there is a relationship between the mass-loss rates of AGB stars and the chemistry within the circumstellar envelopes that this process creates. We have obtained high spectral resolution (R > 60,000) observations with the Echelon Cross Echelle Spectrograph (EXES) aboard SOFIA of a small sample of C, M, and S-type AGB stars. The mass-loss rate of this sample ranges from 10-7 to 10-5 solar masses per year. We have focused on two spectral regions (7.5 & 13—14 μm) that allow us to study several molecules that are either exceedingly difficult to observe from the ground or have no permanent dipole moment.

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  • Agúndez et al. 2020, A&A, 637, A59

  • Fonfría et al. 2019, A&A, 622, L14

  • Fonfría et al 2020, A&A, 643, L15

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