Absorptionsverlauf in Sternfeldern aus dreifarbenphotometrischen Messungen
Abstract
A computer-aided method for interpreting two-color diagrams of star fields is described. It consists in this: all stars of a field are entered into a fractionated two-color diagram and suitable segments of the standard curve are displaced along the reddening line until they cover a star group or individual star. Absorption and distance information is inferred from the amount of the shift. The combination of all results yields a mosaic of the absorption trend that contains some contradictions. These are removed by a statistical procedure in which one first checks whether there exists a standard-curve star with the given proper color and absolute brightness properties. Depending on the goodness of fit between the converted data and the average cosmic data of the proper stellar type, a weighting value is assigned to each star. These weights are added, resulting in a weighted absorption vs distance modulus diagram in which the trend of the maxima yields the desired absorption model. Results obtained by this method for a star field in Cygnus are shown and compared with those obtained by manual interpretation.
- Publication:
-
Mitteilungen der Astronomischen Gesellschaft Hamburg
- Pub Date:
- 1976
- Bibcode:
- 1976MitAG..38..247H
- Keywords:
-
- Absorption Spectra;
- Color Photography;
- Star Distribution;
- Stellar Luminosity;
- Stellar Spectrophotometry;
- Astronomical Photometry;
- Computer Techniques;
- Curve Fitting;
- Red Shift;
- Statistical Analysis;
- Stellar Models;
- X Ray Sources;
- Astronomy