دورية أكاديمية
Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752* * Based on observations made with with the Hobby-Eberly Telescope, which is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen.
| العنوان: | Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752* * Based on observations made with with the Hobby-Eberly Telescope, which is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen. |
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| المؤلفون: | Sandquist, Eric L., Buckner, Andrew J., Shetrone, Matthew D., Barden, Samuel C., Pilachowski, Catherine A., Deliyannis, Constantine P., Harmer, Dianne, Mathieu, Robert, Meibom, Søren, Frandsen, Søren, Orosz, Jerome A. |
| المصدر: | Sandquist , E L , Buckner , A J , Shetrone , M D , Barden , S C , Pilachowski , C A , Deliyannis , C P , Harmer , D , Mathieu , R , Meibom , S , Frandsen , S & Orosz , J A 2023 , ' Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752* * Based on observations made with with the Hobby-Eberly Telescope, which is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen. ' .... |
| سنة النشر: | 2023 |
| المجموعة: | Aarhus University: Research |
| الوصف: | We present analyses of improved photometric and spectroscopic observations for two detached eclipsing binaries at the turnoff of the open cluster NGC 752: the 1.01 days binary DS And and the 15.53 days BD +37 410. For DS And, we find M 1 = 1.692 ± 0.004 ± 0.010M ⊙ , R 1 = 2.185 ± 0.004 ± 0.008R ⊙ , M 2 = 1.184 ± 0.001 ± 0.003M ⊙ , and R 2 = 1.200 ± 0.003 ± 0.005R ⊙ . We either confirm or newly identify unusual characteristics of both stars in the binary: the primary star is found to be slightly hotter than the main-sequence turnoff and there is a more substantial discrepancy in its luminosity compared to models (model luminosities are too large by about 40%), while the secondary star is oversized and cooler compared to other main-sequence stars in the same cluster. The evidence points to nonstandard evolution for both stars, but most plausible paths cannot explain the low luminosity of the primary star. BD +37 410 only has one eclipse per cycle, but extensive spectroscopic observations and the Transiting Exoplanet Survey Satellite light curve constrain the stellar masses well: M 1 = 1.717 ± 0.011M ⊙ and M 2 = 1.175 ± 0.005M ⊙ . The radius of the main-sequence primary star near 2.9R ⊙ definitively requires large convective core overshooting (>0.2 pressure scale heights) in models for its mass, and multiple lines of evidence point toward an age of 1.61 ± 0.03 ± 0.05 Gyr (statistical and systematic uncertainties). Because NGC 752 is currently undergoing the transition from nondegenerate to degenerate He ignition of its red clump stars, BD +37 410 A directly constrains the star mass where this transition occurs. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://pure.au.dk/portal/en/publications/0937b91b-fc66-473c-9656-fddabe9cd23dTest |
| DOI: | 10.3847/1538-3881/ac9c59 |
| الإتاحة: | https://doi.org/10.3847/1538-3881/ac9c59Test https://pure.au.dk/portal/en/publications/0937b91b-fc66-473c-9656-fddabe9cd23dTest http://www.scopus.com/inward/record.url?scp=85144014096&partnerID=8YFLogxKTest |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.DC6EE2B7 |
| قاعدة البيانات: | BASE |
| DOI: | 10.3847/1538-3881/ac9c59 |
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