دورية أكاديمية
The blue straggler V106 in NGC6791 : A prototype progenitor of old single giants masquerading as young
| العنوان: | The blue straggler V106 in NGC6791 : A prototype progenitor of old single giants masquerading as young |
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| المؤلفون: | Brogaard, K., Christiansen, S. M., Grundahl, F., Miglio, A., Izzard, R. G., Tauris, T. M., Sandquist, E. L., Vanden Berg, D. A., Jessen-Hansen, J., Arentoft, T., Bruntt, H., Frandsen, S., Orosz, J. A., Feiden, G. A., Mathieu, R., Geller, A., Shetrone, M., Ryde, N., Stello, D., Platais, I., Meibom, S. |
| المصدر: | Monthly Notices of the Royal Astronomical Society; 481(4), pp 5062-5072 (2018) ; ISSN: 0035-8711 |
| بيانات النشر: | Oxford University Press |
| سنة النشر: | 2018 |
| المجموعة: | Lund University Publications (LUP) |
| مصطلحات موضوعية: | Astronomy, Astrophysics and Cosmology, Binaries: close, Blue stragglers, Stars: fundamental parameters, Stars: individual: V106, White dwarfs |
| الوصف: | We determine the properties of the binary star V106 in the old open cluster NGC6791. We identify the system to be a blue straggler cluster member by using a combination of groundbased and Kepler photometry and multi-epoch spectroscopy. The properties of the primary component are found to be Mp ~ 1.67M⊙, more massive than the cluster turn-off, with Rp ~ 1.91R⊙ and Teff = 7110 ± 100 K. The secondary component is highly oversized and overluminous for its low mass with Ms ~ 0.182M⊙, R⊙ ~ 0.864R⊙, and T⊙ =6875±200 K. We identify this secondary star as a bloated (proto) extremely low-mass helium white dwarf. These properties of V106 suggest that it represents a typical Algol-paradox system and that it evolved through a mass-transfer phase, which provides insight into its past evolution. We present a detailed binary stellar evolution model for the formation of V106 using the MESA code and find that the mass-transfer phase only ceased about 40 Myr ago. Due to the short orbital period (P = 1.4463 d), another mass-transfer phase is unavoidable once the current primary star evolves towards the red giant phase. We argue that V106 will evolve through a common-envelope phase within the next 100 Myr and merge to become a single overmassive giant. The high mass will make it appear young for its true age, which is revealed by the cluster properties. Therefore, V106 is potentially a prototype progenitor of old field giants masquerading as young. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://lup.lub.lu.se/record/aa197dba-0e92-493f-a464-8faada673cbbTest; http://dx.doi.org/10.1093/MNRAS/STY2504Test; scopus:85059612803 |
| DOI: | 10.1093/MNRAS/STY2504 |
| الإتاحة: | https://doi.org/10.1093/MNRAS/STY2504Test https://lup.lub.lu.se/record/aa197dba-0e92-493f-a464-8faada673cbbTest |
| رقم الانضمام: | edsbas.478ABA05 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/MNRAS/STY2504 |
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