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Infrared and visual observations of h and χ Persei

Published online by Cambridge University Press:  04 August 2017

M. Tapia ,
M. Roth ,
R. Costero  and
S. Navarro
M. Tapia
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México
M. Roth
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México
R. Costero
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México
S. Navarro
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México

Extract

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Near-infrared observations of 82 stars in h and χ Persei (NGC 869 and 884) were obtained with the Mexican National Observatory infrared photometer/spectrometer on the 2.1 m telescope at San Pedro Mártir, Baja California. The JHK photometry covers most of the stars in the upper main sequence of the central parts of the clusters as well as the giants and supergiants in a more extended region, with additional L' and M measurements of the brightest members. In Figure 1 the (J-H) vs (H-K) and (H-K) vs (K-L) diagrams are presented. In order to complement the available good quality UBV photometry, we carried out photoelectric measurements of 23 stars in our sample for which only low quality photographic data has been published. These observations were made with the pulse-counting photometer attached to the newly refurbished 1.5 m telescope at San Pedro Mártir.

Type
II. EVOLUTION OF MASSIVE STARS EVOLUTION AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 353 - 354
Copyright
Copyright © Reidel 1984 

References

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