تقرير
Carbon stars in the X-shooter Spectral Library
| العنوان: | Carbon stars in the X-shooter Spectral Library |
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| المؤلفون: | Gonneau, A., Lançon, A., Trager, S. C., Aringer, B., Lyubenova, M., Nowotny, W., Peletier, R. F., Prugniel, P., Chen, Y. -P., Dries, M., Choudhury, O. S., Falcón-Barroso, J., Koleva, M., Meneses-Goytia, S., Sánchez-Blázquez, P., Vazdekis, A. |
| المصدر: | A&A 589, A36 (2016) |
| سنة النشر: | 2016 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies |
| الوصف: | We provide a new collection of spectra of 35 carbon stars obtained with the ESO/VLT X-shooter instrument as part of the X-shooter Spectral Library project. The spectra extend from 0.3$\mu$m to 2.4$\mu$m with a resolving power above $\sim$ 8000. The sample contains stars with a broad range of (J-K) color and pulsation properties located in the Milky Way and the Magellanic Clouds. We show that the distribution of spectral properties of carbon stars at a given (J-K) color becomes bimodal (in our sample) when (J-K) is larger than about 1.5. We describe the two families of spectra that emerge, characterized by the presence or absence of the absorption feature at 1.53$\mu$m, generally associated with HCN and C$_2$H$_2$. This feature appears essentially only in large-amplitude variables, though not in all observations. Associated spectral signatures that we interpret as the result of veiling by circumstellar matter, indicate that the 1.53$\mu$m feature might point to episodes of dust production in carbon-rich Miras. Comment: 29 pages, 21 figures, 9 tables, Accepted for publication in A&A |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/201526292 |
| URL الوصول: | http://arxiv.org/abs/1602.00887 |
| رقم الأكسشن: | edsarx.1602.00887 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/201526292 |
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