تقرير
Creating and using large grids of precalculated model atmospheres for a rapid analysis of stellar spectra
| العنوان: | Creating and using large grids of precalculated model atmospheres for a rapid analysis of stellar spectra |
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| المؤلفون: | Zsargo, J., Fierro-Santillan, C. R., Klapp, J., Arrieta, A., Arias, L., Valencia, J. M., Sigalotti, L. Di G., Hareter, M., Puebla, R. E. |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics |
| الوصف: | $Aims.$ We present a database of 43,340 atmospheric models ($\sim$80,000 models at the conclusion of the project) for stars with stellar masses between 9 and 120 $M_{\odot}$, covering the region of the OB main-sequence and Wolf-Rayet (W-R) stars in the Hertzsprung--Russell (H--R) diagram. $Methods.$ The models were calculated using the ABACUS I supercomputer and the stellar atmosphere code CMFGEN. $Results.$ The parameter space has six dimensions: the effective temperature $T_{eff}$, the luminosity $L$, the metallicity $Z$, and three stellar wind parameters: the exponent $\beta$, the terminal velocity $V_{\infty}$, and the volume filling factor $F_{cl}$. For each model, we also calculate synthetic spectra in the UV (900-2000 A), optical (3500-7000 A), and near-IR (10000-40000 A) regions. To facilitate comparison with observations, the synthetic spectra can be rotationally broadened using ROTIN3, by covering vsin(i) velocities between 10 and 350 km s$^{-1}$ with steps of 10 km s$^{-1}$. $Conclusions.$ We also present the results of the reanalysis of $\epsilon$ Ori using our grid to demonstrate the benefits of databases of precalculated models. Our analysis succeeded in reproducing the best-fit parameter ranges of the original study, although our results favor the higher end of the mass-loss range and a lower level of clumping. Our results indirectly suggest that the resonance lines in the UV range are strongly affected by the velocity-space porosity, as has been suggested by recent theoretical calculations and numerical simulations. Comment: 22 pages, 18 figures, accepted for publication in A&A |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/202038066 |
| URL الوصول: | http://arxiv.org/abs/2009.10879 |
| رقم الأكسشن: | edsarx.2009.10879 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/202038066 |
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