AGB and post-AGB objects in the outer Galaxy
Ryszard Szczerba, Bosco H. K. Yung, Marta Sewi{\l}o, Natasza, Si\'odmiak, Agata Karska
TL;DR
This study uses AllWISE data to identify and classify evolved low- and intermediate-mass stars in the outer Galaxy, developing a colour-colour diagram method to distinguish AGB and post-AGB candidates, despite some contamination.
Contribution
It introduces a new colour-colour diagram approach for selecting AGB and post-AGB star candidates in the outer Galaxy using AllWISE photometry.
Findings
Identified 2,510 AGB star candidates.
Identified 24,821 post-AGB star candidates.
Post-AGB candidates are heavily mixed with young stellar objects.
Abstract
We present the results of our search for low- and intermediate mass evolved stars in the outer Galaxy using AllWISE catalogue photometry. We show that the [3.4]-[12] versus [4.6]-[22] colour-colour diagram is most suitable for separating C-rich/O-rich AGB and post- AGB star candidates. We are able to select 2,510 AGB and 24,821 post-AGB star candidates. However, the latter are severely mixed with the known young stellar objects in this diagram.
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