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

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.
 [1] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Univ. Wroclawski, Wroclaw (Poland)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0004-6361; PII: aa26824-15
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 580; Journal ID: ISSN 0004-6361
EDP Sciences
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS asteroseismology; opacity; OP; OPAL; OPLIB; ATOMIC; stars:oscillations; stars:variables:general; βCephei; SPB; SPBsg