The more the merrier: grid based modelling of Kepler dwarfs with 5-dimensional stellar grids
We present preliminary results of our grid based modelling (GBM) of the dwarf/subgiant sample of stars observed with Kepler including global asteroseismic parameters. GBM analysis in this work is based on a large grid of stellar models that is characterized by five independent parameters: model mass...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
EDP Sciences
2017-01-01
|
Series: | EPJ Web of Conferences |
Online Access: | https://doi.org/10.1051/epjconf/201716003011 |
id |
doaj-d3b2010fe8e04b96afbf369799206722 |
---|---|
record_format |
Article |
spelling |
doaj-d3b2010fe8e04b96afbf3697992067222021-08-02T03:11:22ZengEDP SciencesEPJ Web of Conferences2100-014X2017-01-011600301110.1051/epjconf/201716003011epjconf_azores2017_03011The more the merrier: grid based modelling of Kepler dwarfs with 5-dimensional stellar gridsSerenelli AldoChaplin William J.Huber DanielWe present preliminary results of our grid based modelling (GBM) of the dwarf/subgiant sample of stars observed with Kepler including global asteroseismic parameters. GBM analysis in this work is based on a large grid of stellar models that is characterized by five independent parameters: model mass and age, initial metallicity (Zini), initial helium (Yini), and mixing length parameter (αMLT). Using this grid relaxes assumptions used in all previous GBM work where the initial composition is determined by a single parameter and that αMLT is fixed to a solar-calibrated value. The new grid allows us to study, for example, the impact of different galactic chemical enrichment models on the determination of stellar parameters such as mass radius and age. Also, it allows to include new results from stellar atmosphere models on αMLT in the GBM analysis in a simple manner. Alternatively, it can be tested if global asteroseismology is a useful tool to constraint our ignorance on quantities such as Yini and αMLT. Initial findings show that mass determination is robust with respect to freedom in the latter quantities, with a 4.4% maximum deviation for extreme assumptions regarding prior information on Yini – Zini relations and aMLT. On the other hand, tests carried out so far seem to indicate that global seismology does not have much power to constrain Yini – Zni relations of αMLT values without resourcing to additional information.https://doi.org/10.1051/epjconf/201716003011 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Serenelli Aldo Chaplin William J. Huber Daniel |
spellingShingle |
Serenelli Aldo Chaplin William J. Huber Daniel The more the merrier: grid based modelling of Kepler dwarfs with 5-dimensional stellar grids EPJ Web of Conferences |
author_facet |
Serenelli Aldo Chaplin William J. Huber Daniel |
author_sort |
Serenelli Aldo |
title |
The more the merrier: grid based modelling of Kepler dwarfs with 5-dimensional stellar grids |
title_short |
The more the merrier: grid based modelling of Kepler dwarfs with 5-dimensional stellar grids |
title_full |
The more the merrier: grid based modelling of Kepler dwarfs with 5-dimensional stellar grids |
title_fullStr |
The more the merrier: grid based modelling of Kepler dwarfs with 5-dimensional stellar grids |
title_full_unstemmed |
The more the merrier: grid based modelling of Kepler dwarfs with 5-dimensional stellar grids |
title_sort |
more the merrier: grid based modelling of kepler dwarfs with 5-dimensional stellar grids |
publisher |
EDP Sciences |
series |
EPJ Web of Conferences |
issn |
2100-014X |
publishDate |
2017-01-01 |
description |
We present preliminary results of our grid based modelling (GBM) of the dwarf/subgiant sample of stars observed with Kepler including global asteroseismic parameters. GBM analysis in this work is based on a large grid of stellar models that is characterized by five independent parameters: model mass and age, initial metallicity (Zini), initial helium (Yini), and mixing length parameter (αMLT). Using this grid relaxes assumptions used in all previous GBM work where the initial composition is determined by a single parameter and that αMLT is fixed to a solar-calibrated value. The new grid allows us to study, for example, the impact of different galactic chemical enrichment models on the determination of stellar parameters such as mass radius and age. Also, it allows to include new results from stellar atmosphere models on αMLT in the GBM analysis in a simple manner. Alternatively, it can be tested if global asteroseismology is a useful tool to constraint our ignorance on quantities such as Yini and αMLT. Initial findings show that mass determination is robust with respect to freedom in the latter quantities, with a 4.4% maximum deviation for extreme assumptions regarding prior information on Yini – Zini relations and aMLT. On the other hand, tests carried out so far seem to indicate that global seismology does not have much power to constrain Yini – Zni relations of αMLT values without resourcing to additional information. |
url |
https://doi.org/10.1051/epjconf/201716003011 |
work_keys_str_mv |
AT serenellialdo themorethemerriergridbasedmodellingofkeplerdwarfswith5dimensionalstellargrids AT chaplinwilliamj themorethemerriergridbasedmodellingofkeplerdwarfswith5dimensionalstellargrids AT huberdaniel themorethemerriergridbasedmodellingofkeplerdwarfswith5dimensionalstellargrids AT serenellialdo morethemerriergridbasedmodellingofkeplerdwarfswith5dimensionalstellargrids AT chaplinwilliamj morethemerriergridbasedmodellingofkeplerdwarfswith5dimensionalstellargrids AT huberdaniel morethemerriergridbasedmodellingofkeplerdwarfswith5dimensionalstellargrids |
_version_ |
1721243493909659648 |