Modeling the near-ultraviolet band of gk stars. i. local thermodynamic equilibrium models

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Autor/in:
Erscheinungsjahr:
2010
Medientyp:
Text
Schlagworte:
  • Stars
  • Abundance
  • Carbon-enhanced metal-poor
  • Galaxies
  • Planets
  • Stars: atmospheres
  • Stars: fundamental parameters
  • Stars: late-type
  • Stars
  • Abundance
  • Carbon-enhanced metal-poor
  • Galaxies
  • Planets
Beschreibung:
  • We present a grid of LTE atmospheric models and synthetic spectra that covers the spectral class range from mid-G to mid-K, and luminosity classes from V to III, that is dense in Teff sampling (ΔTeff = 62.5 K), for stars of solar metallicity and moderately metal-poor scaled solar abundance ([ A/H ] = 0.0 and -0.5). All models have been computed with two choices of atomic line list: (1) the "big" line lists of Kurucz that best reproduce the broadband solar blue and near-UV fλ level, and (2) the "small" lists of Kurucz & Peytremann that provide the best fit to the high-resolution solar blue and near-UV spectrum. We compare our model spectral energy distributions to a sample of stars carefully selected from the large catalog of uniformly re-calibrated spectrophotometry of Burnashev with the goal of determining how the quality of fit varies with stellar parameters, especially in the historically troublesome blue and near-UV bands. We confirm that our models computed with the "big" line list recover the derived Teff values of the PHOENIX NextGen grid, but find that the models computed with the "small" line list provide greater internal self-consistency among different spectral bands, and closer agreement with the empirical Teff scale of Ramirez & Melendez, but not to the interferometrically derived Teff values of Baines et al. We find no evidence that the near-UV band discrepancy between models and observations for Arcturus (α Boo) reported in two works by Short & Hauschildt is pervasive, and that Arcturus may be peculiar in this regard. © 2010. The American Astronomical Society. All rights reserved.
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  • info:eu-repo/semantics/restrictedAccess
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Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/e3e30ac3-1dd3-44d3-b67c-9081b69cbca6