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On the circumstellar envelopes of semi-regular long-period variables

Published online by Cambridge University Press:  30 December 2019

J. J. Díaz-Luis
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain email: jjairo@oan.es
J. Alcolea
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain email: jjairo@oan.es
V. Bujarrabal
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain email: jjairo@oan.es
M. Santander-García
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain email: jjairo@oan.es
M. Gómez-Garrido
Affiliation:
Instituto Geográfico Nacional (IGN), Centro de Desarrollos Tecnológicos, Observatorio de Yebes, Spain
J.-F. Desmurs
Affiliation:
Observatorio Astronómico Nacional (IGN), Spain email: jjairo@oan.es
Corresponding
E-mail address:

Abstract

The mass loss process along the AGB phase is crucial for the formation of circumstellar envelopes (CSEs), which in the post-AGB phase will evolve into planetary nebulae (PNe). There are still important issues that need to be further explored in this field; in particular, the formation of axially symmetric PNe from spherical CSEs. To address the problem, we have conducted high S/N IRAM 30 m observations of 12COJ = 1−0 and J = 2−1, and 13COJ = 1−0 in a volume-limited unbiased sample of semi-regular variables (SRs). We also conducted Yebes 40 m SiO J = 1−0 observations in 1/2 of the sample in order to complement our 12CO observations. We report a moderate correlation between mass loss rate and the 12CO(1−0)−to−12CO(2−1) line intensity ratio, introducing a possible new method for determining mass loss rates of SRs with short analysis time. We also find that for several stars the SiO profiles are very similar to the 12CO profiles, a totally unexpected result unless these are non-standard envelopes.

Type
Contributed Papers
Copyright
© International Astronomical Union 2019 

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On the circumstellar envelopes of semi-regular long-period variables
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