Infrared and Visual Observations of H-Persei and Chi-Persei
Abstract
Near-infrared observations of 82 stars in h and χ Persei (NGC 869 and 884) were obtained. (J-H) vs (H-K) and (H-K) vs (K-L) diagrams are presented. From the infrared data alone, the authors find a unique value for the extinction in the direction of both clusters and for stars of all luminosity classes. From the infrared characteristics two clearly distinguishable groups of B supergiants are found. Most of the Be stars in χ Persei present significant infrared excesses. Schild's (1967) suggestion is supported that h Persei is younger, by a factor of two in age, than χ Persei.
- Publication:
-
Observational Tests of the Stellar Evolution Theory
- Pub Date:
- 1984
- Bibcode:
- 1984IAUS..105..353T