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Measuring spatially resolved gas-to-dust ratios in AGB stars

Published online by Cambridge University Press:  30 December 2019

Sofia Wallström Open the ORCID record for Sofia Wallström [Opens in a new window] ,
T. Dharmawardena ,
B. Rodríguez Marquina ,
P. Scicluna ,
S. Srinivasan Open the ORCID record for S. Srinivasan [Opens in a new window] ,
F. Kemper Open the ORCID record for F. Kemper [Opens in a new window]  and
The NESS Collaboration
Sofia Wallström
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)11F Astronomy-Mathematics Bldg., No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan
T. Dharmawardena
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)11F Astronomy-Mathematics Bldg., No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan
B. Rodríguez Marquina
Affiliation:
Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú Av. Universitaria1801 San Miguel, Lima 32, Perú
P. Scicluna
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)11F Astronomy-Mathematics Bldg., No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan
S. Srinivasan
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)11F Astronomy-Mathematics Bldg., No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan
F. Kemper
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics (ASIAA)11F Astronomy-Mathematics Bldg., No.1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan
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Abstract

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Gas-to-dust ratios in Asymptotic Giant Branch (AGB) stars are used to calculate gas masses from measured dust masses and vice versa, but can vary widely and are rarely directly measured. In this work, we present spatially resolved gas and dust masses for a sample of 8 nearby AGB stars, using JCMT CO-line and continuum observations, and compare them. This serves as a pilot study for the Nearby Evolved Stars Survey (NESS; PI: P. Scicluna) project which will provide similar observations of ∼400 AGB stars in a volume-limited sample.

Keywords

stars: AGB and post-AGBstars: mass loss(stars:) circumstellar matter

References

De Beck, E., Decin, L., de Koter, A., et al. 2010, A&A, 523, 18 Google Scholar
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