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Updates on the Ultraviolet Emission from Asymptotic Giant Branch Stars

Published online by Cambridge University Press:  30 December 2019

Rodolfo Montez Jr. Open the ORCID record for Rodolfo Montez Jr. [Opens in a new window] ,
Sofia Ramstedt ,
Joel H. Kastner  and
Wouter Vlemmings
Rodolfo Montez Jr.
Affiliation:
Smithsonian Astrophysical Observatory, Cambridge, MAUSA email: [email protected]
Sofia Ramstedt
Affiliation:
Uppsala University, Uppsala, Sweden
Joel H. Kastner
Affiliation:
Rochester Institute of Technology, Rochester, NYUSA
Wouter Vlemmings
Affiliation:
Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden
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Abstract

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A comprehensive study of UV emission from asymptotic giant branch (AGB) stars with the Galaxy Evolution Explorer (GALEX) revealed that out of the 316 observed AGB stars, 57% were detected in the near-UV (NUV) bandpass and 12% were detected in the far-UV (FUV) bandpass (Montez et al. 2017). A cross-match between our sample and Gaia DR2 results in parallax estimates for 90% of the sample of AGB stars, compared to only 30% from Hipparcos. This increase allowed us to further probe trends and conclusions of our initial study. Specifically, that the detection of UV emission from AGB stars is subject to proximity and favorable lines of sight in our Galaxy. These improved results support the notion that some of the GALEX-detected UV emission is intrinsic to AGB stars, likely due to a combination of photospheric and chromospheric emission.

Keywords

stars: AGB and post-AGBultraviolet: starsstars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 474 - 475
Copyright
© International Astronomical Union 2019 

References

Chiavassa, A., Freytag, B., & Schultheis, M. 2018, A&A, 617, L1 Google Scholar
Collaboration, Gaia 2017, A&A, 605, A79 Google Scholar
Collaboration, Gaia 2016, A&A, 595, A1 Google Scholar
Montez, R. Jr., Ramstedt, S., et al. 2017, ApJ, 841, 33 CrossRefGoogle Scholar