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Outflows and disks in post-RGB objects — products of common envelope ejection?

Published online by Cambridge University Press:  30 November 2022

Geetanjali Sarkar Open the ORCID record for Geetanjali Sarkar [Opens in a new window]  and
Raghvendra Sahai
Geetanjali Sarkar
Affiliation:
Department of Physics, Indian Institute of Technology, Kanpur U.P., India email: [email protected]
Raghvendra Sahai
Affiliation:
Jet Propulsion Laboratory Pasadena, CA, USA
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Abstract

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Interacting binaries within a common envelope, wherein the primary is a red giant are believed to result in a recently identified evolutionary class – the dusty post-RGB stars. Our SED modeling of eight post-RGBs in the LMC indicates the presence of geometrically thick disks with substantial opening angle in addition to the outer shells. We estimated the total dust mass (and gas mass assuming gas-to-dust ratio) in the disks and shells and set constraints on the dust grain compositions and sizes. The only known Galactic object of this class is the Boomerang nebula. Additionally, we present a DUSTY model of the Boomerang that can serve as a template for 2D modeling of the object using RADMC-3D. 2D modeling is essential to dissect the morphology of the spatially-unresolved post-RGBs in the LMC. These models may then be tested with future HST and ALMA imaging, together with JWST spectroscopy of these objects.

Keywords

(stars:) circumstellar matter(stars:) binaries (including multiple): closestars: evolutionstars: AGB and post-AGB
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 314 - 320
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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