Interpretation of the BRITE oscillation data of the hybrid pulsator ν Eridani: a call for the modification of stellar opacities
Abstract
The analysis of the BRIght Target Explorer (BRITE) oscillation spectrum of the main-sequence early B-type star ν Eridani is presented in this paper. Only models with the modified mean opacity profile can account for the observed frequency ranges as well as for the values of some individual frequencies. The number of the κ-modified seismic models is constrained by the non-adiabatic parameter f, which is very sensitive to the opacity changes in the subphotospheric layers, where the pulsations are driven. We present an example of the model that satisfies all the above conditions. It seems that the OPLIB opacities are preferred over those from the OPAL and OP projects. Finally and moreover, we discuss additional consequences of the opacity modification, namely, an enhancement of the efficiency of convection in the Z bump as well as an occurrence of close radial modes which is a kind of avoided-crossing phenomenon common for non-radial modes in standard main-sequence models.
- Authors:
-
- Univ. of Wroclaw (Poland). Astronomical Inst.
- Nicolaus Copernicus Astronomical Center, Warsaw (Poland)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Univ. of Wroclaw (Poland); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Science Centre (NCN) (Poland); European Commission (EC)
- OSTI Identifier:
- 1412884
- Report Number(s):
- LA-UR-16-27397
Journal ID: ISSN 0035-8711; TRN: US1800392
- Grant/Contract Number:
- AC52-06NA25396; 2015/17/B/ST9/02082; 269194
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 466; Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; early-type stars; oscillations; ν Eri; atomic data opacities
Citation Formats
Daszyńska-Daszkiewicz, J., Pamyatnykh, A. A., Walczak, P., Colgan, J., Fontes, C. J., and Kilcrease, D. P. Interpretation of the BRITE oscillation data of the hybrid pulsator ν Eridani: a call for the modification of stellar opacities. United States: N. p., 2016.
Web. doi:10.1093/mnras/stw3315.
Daszyńska-Daszkiewicz, J., Pamyatnykh, A. A., Walczak, P., Colgan, J., Fontes, C. J., & Kilcrease, D. P. Interpretation of the BRITE oscillation data of the hybrid pulsator ν Eridani: a call for the modification of stellar opacities. United States. https://doi.org/10.1093/mnras/stw3315
Daszyńska-Daszkiewicz, J., Pamyatnykh, A. A., Walczak, P., Colgan, J., Fontes, C. J., and Kilcrease, D. P. Thu .
"Interpretation of the BRITE oscillation data of the hybrid pulsator ν Eridani: a call for the modification of stellar opacities". United States. https://doi.org/10.1093/mnras/stw3315. https://www.osti.gov/servlets/purl/1412884.
@article{osti_1412884,
title = {Interpretation of the BRITE oscillation data of the hybrid pulsator ν Eridani: a call for the modification of stellar opacities},
author = {Daszyńska-Daszkiewicz, J. and Pamyatnykh, A. A. and Walczak, P. and Colgan, J. and Fontes, C. J. and Kilcrease, D. P.},
abstractNote = {The analysis of the BRIght Target Explorer (BRITE) oscillation spectrum of the main-sequence early B-type star ν Eridani is presented in this paper. Only models with the modified mean opacity profile can account for the observed frequency ranges as well as for the values of some individual frequencies. The number of the κ-modified seismic models is constrained by the non-adiabatic parameter f, which is very sensitive to the opacity changes in the subphotospheric layers, where the pulsations are driven. We present an example of the model that satisfies all the above conditions. It seems that the OPLIB opacities are preferred over those from the OPAL and OP projects. Finally and moreover, we discuss additional consequences of the opacity modification, namely, an enhancement of the efficiency of convection in the Z bump as well as an occurrence of close radial modes which is a kind of avoided-crossing phenomenon common for non-radial modes in standard main-sequence models.},
doi = {10.1093/mnras/stw3315},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 466,
place = {United States},
year = {Thu Dec 22 00:00:00 EST 2016},
month = {Thu Dec 22 00:00:00 EST 2016}
}
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Works referencing / citing this record:
Seismic modelling of early B-type pulsators observed by BRITE – I. θ Ophiuchi
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Age Determination of Galactic B-type Stars in Double-lined Eclipsing Binaries
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