تقرير
The sdA problem - II. Photometric and Spectroscopic Follow-up
| العنوان: | The sdA problem - II. Photometric and Spectroscopic Follow-up |
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| المؤلفون: | Pelisoli, Ingrid, Kepler, S. O., Koester, D., Castanheira, B. G., Romero, A. D., Fraga, L. |
| سنة النشر: | 2018 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | Subdwarf A star (sdA) is a spectral classification given to objects showing H-rich spectra and sub-main sequence surface gravities, but effective temperature lower than the zero-age horizontal branch. Their evolutionary origin is an enigma. In this work, we discuss the results of follow-up observations of selected sdAs. We obtained time resolved spectroscopy for 24 objects, and time-series photometry for another 19 objects. For two targets, we report both spectroscopy and photometry observations. We confirm seven objects to be new extremely-low mass white dwarfs (ELMs), one of which is a known eclipsing star. We also find the eighth member of the pulsating ELM class. Comment: Accepted for publication in MNRAS. 19 pages, 30 figures, 6 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/sty1101 |
| URL الوصول: | http://arxiv.org/abs/1804.09059 |
| رقم الأكسشن: | edsarx.1804.09059 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/sty1101 |
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