Updates on the Ultraviolet Emission from Asymptotic Giant Branch Stars
Journal article, 2019

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.

ultraviolet: stars

stars: AGB and post-AGB

stars: evolution

Author

R. Montez

Smithsonian Astrophysical Observatory

S. Ramstedt

Uppsala University

J. H. Kastner

Rochester Institute of Technology

Wouter Vlemmings

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

Proceedings of the International Astronomical Union

1743-9213 (ISSN) 1743-9221 (eISSN)

Vol. 14 474-475

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1017/S1743921318007160

More information

Latest update

12/6/2020