J/A+A/688/A197 Updated BOSZ synthetic stellar spectral library (Meszaros+, 2024)
The updated BOSZ synthetic stellar spectral library.
Meszaros S., Bohlin R., Allende Prieto C., Cseh B., Kovacs J., Fleming S.W.,
Dencs Z., Deustua S., Gordon K.D., Hubeny I., Mezo G., Truszek M.
<Astron. Astrophys. 688, A197 (2024)>
=2024A&A...688A.197M 2024A&A...688A.197M (SIMBAD/NED BibCode)
ADC_Keywords: Spectroscopy ; Models ; Spectra, optical ; Spectra, infrared
Keywords: radiative transfer - stars: abundances - stars: atmospheres
Abstract:
The modeling of stellar spectra of flux standards observed by the
Hubble and James Webb space telescopes requires a large synthetic
spectral library that covers a wide atmospheric parameter range.
The aim of this paper is to present and describe the calculation
methods behind the updated version of the BOSZ synthetic spectral
database, which was originally designed to fit the CALSPEC flux
standards. These new local thermodynamic equilibrium (LTE) models
incorporate both MARCS and ATLAS9 model atmospheres, updated
continuous opacities, and 23 new molecular line lists.
The new grid was calculated with Synspec using the LTE approximation
and covers metallicities [M/H] from -2.5 to 0.75dex, [α/M] from
-0.25 to 0.5dex, and [C/M] from -0.75 to 0.5dex, providing spectra for
336 unique compositions. Calculations for stars between 2800 and 8000K
use MARCS model atmospheres, and ATLAS9 is used between 7500 and
16000K.
The new BOSZ grid includes 628620 synthetic spectra from 50nm to 32um
with models for 495 Teff-logg parameter pairs per composition and per
microturbulent velocity. Each spectrum has eight different resolutions
spanning a range from R=500 to 50000 as well as the original
resolution of the synthesis. The microturbulent velocities are 0, 1,
2, and 4km/s.
The new BOSZ grid extends the temperature range to cooler temperatures
compared to the original grid because the updated molecular line lists
make modeling possible for cooler stars. A publicly available and
consistently calculated database of model spectra is important for
many astrophysical analyses, for example spectroscopic surveys and the
determination of stellar elemental compositions.
Description:
Atmospheric parameters (Teff, logg, [M/H], [alpha/M], [C/M]) of the
missing MARCS models.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 27 9165 Parameters of the missing MARCS models
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 K Teff Effective temperature
6- 9 F4.1 [cm/s2] logg Surgace gravity
11- 15 F5.2 [-] [M/H] Metallicity
17- 21 F5.2 [-] [a/M] alpha abundance
23- 27 F5.2 [-] [C/M] Carbon abundance
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Acknowledgements:
Szabolcs Meszaros, meszi(at)gothard.hu
(End) Patricia Vannier [CDS] 12-Jul-2024