Bulletin of the American Physical Society
Four Corners Section 2022 Meeting
Volume 67, Number 14
Friday–Saturday, October 14–15, 2022; Albuquerque, New Mexico
Session B04: Astrophysics I
10:00 AM–11:36 AM,
Friday, October 14, 2022
UNM
Room: PAIS 1160
Chair: Denise Stephens, Brigham Young University
Abstract: B04.00007 : Studies of Mass Loss in Pulsating Asymptotic Giant Branch Stars*
11:24 AM–11:36 AM
Presenter:
Henry A Prager
(New Mexico Inst. of Mining and Tech., Los Alamos Natl Lab)
Authors:
Henry A Prager
(New Mexico Inst. of Mining and Tech., Los Alamos Natl Lab)
Lee Anne M Willson
(Iowa State University)
Joyce A Guzik
(Los Alamos Natl Lab)
Michelle J Creech-Eakman
(New Mexico Institute of Mining and Technology)
Massimo Marengo
(Florida State University)
Qian Wang
(Iowa State University)
Characterizing mass loss in these stars in terms of their physical properties has historically been difficult. Recent surveys have led to large sets of reliable pulsation period (P) data for extragalactic stars, but there is still significant difficulty in measuring the luminosities (L), and to a lesser extent mass-loss rates, accurately. This issue makes standard fitting approaches unreliable. We have developed a method using the distribution of these stars in LP-space to determine mass-loss rate formulas. These formulas are in agreement with models and known constraints on their evolution.
The large population of stars also provides an ideal test for stellar models. While modern models reproduce solar-composition stars, they struggle with low metallicity stars. We are examining grids of atmospheric models, to determine where the current limits of those models place us and what processes may need to be added to reach agreement with observations.
*Additional funding for this work was provided by the New Mexico Space Grant Consortium (2021-2022).
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