A theoretical analysis of uvby photometry.
Abstract
Theoretical Stromgren uvby and Johnson-Morgan UBV colors have been calculated from the Kurucz (1978) grid of model atmospheres for G, F, A, B, and O stars, and calibrated to the standard systems using a model atmosphere for Vega with an effective temperature of 9400 K and log g = 3.95. The resultant color-color grids are analyzed, and the usefulness of the photometric systems for derivation of atmospheric effective temperature, surface gravity, and abundance is assessed. For the uvby system, excellent agreement between the models and observations is obtained for effective temperatures of at least 8500 K, and photometric grids for use in reducing observations are presented. A discrepancy is found for effective temperatures below 8500 K, and possible sources of error are discussed. For the UBV system, because of nonlinear transformations, no accurate system calibration is presented.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- May 1978
- DOI:
- 10.1086/190517
- Bibcode:
- 1978ApJS...37...45R
- Keywords:
-
- Stellar Atmospheres;
- Stellar Spectrophotometry;
- Ubv Spectra;
- Color;
- Graphs (Charts);
- Stellar Models;
- Tables (Data);
- Astronomy;
- Early-Type Stars:Stroemgren Photometry;
- Photometric Systems;
- Stellar Atmospheres: Models