Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-10
Astron.Astrophys. 392 (2002) 619-636
Astronomy and Astrophysics
Astrophysics
20 pages, 10 figures, accepted by A&A
Scientific paper
10.1051/0004-6361:20020788
We present several new sets of grids of model stellar atmospheres computed with modified versions of the ATLAS9 code. Each individual set consists of several grids of models with different metallicities ranging from [M/H] = -2.0 to +1.0 dex. The grids range from 4000 to 10000 K in T_eff and from 2.0 to 5.0 dex in logg. The individual sets differ from each other and from previous ones essentially in the physics used for the treatment of the convective energy transport, in the higher vertical resolution of the atmospheres and in a finer grid in the (T_eff, logg) plane. These improvements enable the computation of derivatives of color indices accurate enough for pulsation mode identification. In addition, we show that the chosen vertical resolution is necessary and sufficient for the purpose of stellar interior modelling. To explain the physical differences between the model grids we provide a description of the currently available modifications of ATLAS9 according to their treatment of convection. Our critical analysis of the dependence of the atmospheric structure and observable quantities on convection treatment, vertical resolution and metallicity reveals that spectroscopic and photometric observations are best represented when using an inefficient convection treatment. This conclusion holds whatever convection formulation investigated here is used, i.e. MLT(alpha=0.5), CM and CGM are equivalent. We also find that changing the convection treatment can lead to a change in the effective temperature estimated from Stroemgren color indices from 200 to 400 K.
't Veer-Menneret van C.
Barban Caroline
Garrido Rafa
Goupil Marie Jo
Heiter Ulrike
No associations
LandOfFree
New grids of ATLAS9 atmospheres I: Influence of convection treatments on model structure and on observable quantities does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New grids of ATLAS9 atmospheres I: Influence of convection treatments on model structure and on observable quantities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New grids of ATLAS9 atmospheres I: Influence of convection treatments on model structure and on observable quantities will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-518292