Updated High-temperature Opacities for the Dartmouth Stellar Evolution Program and Their Effect on the Jao Gap Location
The Jao Gap, a 17% decrease in stellar density at M _G ∼ 10 identified in both Gaia Data Release 2 and Early Data Release 3, presents a new method to probe the interior structure of stars near the fully convective transition mass. The Gap is believed to originate from convective-kissing instability...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acb685 |
| _version_ | 1797702044411232256 |
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| author | Thomas M. Boudreaux Brian C. Chaboyer |
| author_facet | Thomas M. Boudreaux Brian C. Chaboyer |
| author_sort | Thomas M. Boudreaux |
| collection | DOAJ |
| description | The Jao Gap, a 17% decrease in stellar density at M _G ∼ 10 identified in both Gaia Data Release 2 and Early Data Release 3, presents a new method to probe the interior structure of stars near the fully convective transition mass. The Gap is believed to originate from convective-kissing instability wherein asymmetric production of ^3 He causes the core convective zone of a star to periodically expand and contract and consequently causes the star luminosities to vary. Modeling of the Gap has revealed a sensitivity in its magnitude to a population metallicity primarily through opacity. Thus far, models of the Jao Gap have relied on OPAL high-temperature radiative opacities. Here we present updated synthetic population models tracing the Gap location modeled with the Dartmouth stellar evolution code using the OPLIB high-temperature radiative opacities. Use of these updated opacities changes the predicted location of the Jao Gap by ∼0.05 mag as compared to models that use the OPAL opacities. This difference is likely too small to be detectable in empirical data. |
| first_indexed | 2024-03-12T04:45:31Z |
| format | Article |
| id | doaj.art-f14d74df423e4e2eb50799a09897e059 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:45:31Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj.art-f14d74df423e4e2eb50799a09897e0592023-09-03T09:29:32ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01944212910.3847/1538-4357/acb685Updated High-temperature Opacities for the Dartmouth Stellar Evolution Program and Their Effect on the Jao Gap LocationThomas M. Boudreaux0https://orcid.org/0000-0002-2600-7513Brian C. Chaboyer1https://orcid.org/0000-0003-3096-4161Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755, USA ; thomas@boudreauxmail.com, thomas.m.boudreaux.gr@dartmouth.eduDepartment of Physics and Astronomy, Dartmouth College, Hanover, NH 03755, USA ; thomas@boudreauxmail.com, thomas.m.boudreaux.gr@dartmouth.eduThe Jao Gap, a 17% decrease in stellar density at M _G ∼ 10 identified in both Gaia Data Release 2 and Early Data Release 3, presents a new method to probe the interior structure of stars near the fully convective transition mass. The Gap is believed to originate from convective-kissing instability wherein asymmetric production of ^3 He causes the core convective zone of a star to periodically expand and contract and consequently causes the star luminosities to vary. Modeling of the Gap has revealed a sensitivity in its magnitude to a population metallicity primarily through opacity. Thus far, models of the Jao Gap have relied on OPAL high-temperature radiative opacities. Here we present updated synthetic population models tracing the Gap location modeled with the Dartmouth stellar evolution code using the OPLIB high-temperature radiative opacities. Use of these updated opacities changes the predicted location of the Jao Gap by ∼0.05 mag as compared to models that use the OPAL opacities. This difference is likely too small to be detectable in empirical data.https://doi.org/10.3847/1538-4357/acb685Stellar evolutionStellar evolutionary models |
| spellingShingle | Thomas M. Boudreaux Brian C. Chaboyer Updated High-temperature Opacities for the Dartmouth Stellar Evolution Program and Their Effect on the Jao Gap Location The Astrophysical Journal Stellar evolution Stellar evolutionary models |
| title | Updated High-temperature Opacities for the Dartmouth Stellar Evolution Program and Their Effect on the Jao Gap Location |
| title_full | Updated High-temperature Opacities for the Dartmouth Stellar Evolution Program and Their Effect on the Jao Gap Location |
| title_fullStr | Updated High-temperature Opacities for the Dartmouth Stellar Evolution Program and Their Effect on the Jao Gap Location |
| title_full_unstemmed | Updated High-temperature Opacities for the Dartmouth Stellar Evolution Program and Their Effect on the Jao Gap Location |
| title_short | Updated High-temperature Opacities for the Dartmouth Stellar Evolution Program and Their Effect on the Jao Gap Location |
| title_sort | updated high temperature opacities for the dartmouth stellar evolution program and their effect on the jao gap location |
| topic | Stellar evolution Stellar evolutionary models |
| url | https://doi.org/10.3847/1538-4357/acb685 |
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