Deriving the structure of pre-supernovae and delta Scuti stars using nonradial oscillations

Technical Report · Sun Nov 01 04:00:00 EST 1998

DOI:https://doi.org/10.2172/674869· OSTI ID:674869

Guzik, J A; Bradley, P A; Cox, A N; Swenson, F J; Deupree, R G; Soukup, M S ^[1]; Templeton, M R ^[2]; Despain, K M ^[3]

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1. Los Alamos National Lab., NM (United States)
2. New Mexico State Univ., Las Cruces, NM (United States)
3. Brigham Young Univ., Provo, UT (United States)

This is the final report of a three-year Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The objective is to learn more about the internal structure of two classes of variable stars, by using the observational data afforded by their pulsation properties. The authors updated the one-dimensional computer codes to calculate the evolution and pulsation frequencies of representative delta Scuti and LBV models. They compared the observed pulsation properties with model predictions in an iterative process to find a model (or models) with interior structures that matched the observational constraints for several delta Scuti stars. They carried out nonlinear hydrodynamic modeling of LBV envelopes and proposed a mechanism for their periodic outbursts. Finally, they began validation of a two-dimensional stellar evolution code that will be used to investigate the effects of rotation and hydrodynamic instabilities on the interior structure of these stars.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Management and Administration, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 674869
• Report Number(s): LA-UR--98-1881; ON: DE99000871
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
MASS TRANSFER
MORPHOLOGY
NONLINEAR PROBLEMS
PULSATIONS
ROTATION
STAR EVOLUTION
STAR MODELS
STELLAR WINDS
VARIABLE STARS