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| Paper: |
Parallaxes and Luminosities of Moderately Hot Stars with Photometric Boxes |
| Volume: |
167, Harmonizing Cosmic Distance Scales in a Post-Hipparcos Era |
| Page: |
292 |
| Authors: |
Nicolet, Bernard |
| Abstract: |
The principle of the photometric boxes in the Geneva photometry is rather simple: a set of stars having approximately the same colour indices as a given (central) star is a "box". Due to the excellent homogeneity of the Geneva photometry, the stars of the box are expected to have physical properties to those of the central star, at least for some types: dwarf and giant B5-A3 stars, for example. If the luminosities of the stars members of a box are comparable to the luminosity of the central star, a statistical treatment from the parallaxes --even very small and even negative-- is able to provide essential informations for the central star. The box method can be refined. Measurements in the far UV is a a possibility. Another improvement is to take the --small-- differences between stars in a box into account. These photometric differences could correspond to a difference in their luminosities. The use of theoretical models of atmospheres allows us to eliminate such luminosity differences and to reduce thus the error bars. |
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