2020A&A...643A..88Z


Query : 2020A&A...643A..88Z

2020A&A...643A..88Z - Astronomy and Astrophysics, volume 643A, 88-88 (2020/11-1)

Creating and using large grids of precalculated model atmospheres for a rapid analysis of stellar spectra.

ZSARGO J., FIERRO-SANTILLAN C.R., KLAPP J., ARRIETA A., ARIAS L., VALENCIA J.M., SIGALOTTI L.D.G., HARETER M. and PUEBLA R.E.

Abstract (from CDS):


Aims. We present a database of 43 340 atmospheric models (∼80 000 models at the conclusion of the project) for stars with stellar masses between 9 and 120 M, covering the region of the OB main-sequence and Wolf-Rayet stars in the Hertzsprung-Russell 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 Teff, the luminosity L, the metallicity Z, and three stellar wind parameters: the exponent β, the terminal velocity V, and the volume filling factor Fcl. For each model, we also calculate synthetic spectra in the UV (900-2000Å), optical (3500-7000Å), and near-IR (10000-40000Å) regions. To facilitate comparison with observations, the synthetic spectra can be rotationally broadened using ROTIN3, by covering vsini velocities between 10 and 350km/s with steps of 10km/s.
Conclusions. We also present the results of the reanalysis of ε 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.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: atmospheres - methods: data analysis - miscellaneous

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 882 0
2 NAME Ori I As* 05 38 -02.8           ~ 590 0
3 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1133 1
4 NAME Ori Belt reg ~ ~           ~ 73 0

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2022.12.07-05:24:20

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