Wider pulsation instability regions for β Cephei and SPB stars calculated using new Los Alamos opacities

Walczak, Przemysław; Fontes, Christopher John; Colgan, James Patrick; Kilcrease, David Parker; Guzik, Joyce Ann

doi:10.1051/0004-6361/201526824

Wider pulsation instability regions for β Cephei and SPB stars calculated using new Los Alamos opacities

Journal Article · Thu Aug 13 00:00:00 EDT 2015 · Astronomy and Astrophysics

DOI:https://doi.org/10.1051/0004-6361/201526824· OSTI ID:1247306

Walczak, Przemysław ^[1]; Fontes, Christopher John ^[2]; Colgan, James Patrick ^[2]; Kilcrease, David Parker ^[2]; Guzik, Joyce Ann ^[2]

Univ. Wroclawski, Wroclaw (Poland)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, our goal is to test the newly developed OPLIB opacity tables from Los Alamos National Laboratory and check their influence on the pulsation properties of B-type stars. We calculated models using MESA and Dziembowski codes for stellar evolution and linear, nonadiabatic pulsations, respectively. We derived the instability domains of β Cephei and SPB-types for different opacity tables OPLIB, OP, and OPAL. As a result, the new OPLIB opacities have the highest Rosseland mean opacity coefficient near the so-called Z-bump. Therefore, the OPLIB instability domains are wider than in the case of OP and OPAL data.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1247306

Report Number(s):: LA-UR--15-24672; PII: aa26824-15

Journal Information:: Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 580; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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