High angular resolution uvby-beta observations of stars earlier than G/O in the intermediate and low latitude areas SA 128 and SA 156

Astronomy and Astrophysics – Astrophysics

Scientific paper

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A Stars, Angular Resolution, High Resolution, Molecular Clouds, Stellar Evolution, Stellar Spectrophotometry, Astronomical Catalogs, B Stars, Cosmic Dust, F Stars, Interstellar Extinction, Latitude, Particle Size Distribution, Spectral Resolution, Stellar Luminosity, Ubv Spectra

Scientific paper

The objective is to estimate the dimensions of a minor molecular cloud and to evaluate the cloud extinction by means of a reddening in the cloud. Detailed ubvy-beta observations of all B, A, and F stars brighter than approximately 11.5 mag are made in two regions. One area, SA 128, is at intermediate galactic latitude (b approximately 46 deg); the other, SA 156, is at a low latitude (b approximately 13 deg). It is noted that SA 156 contains the PKS 1622-29 direction, where detailed radio observations are available. In the two areas (SA 128 and SA 156) uvby-beta data are obtained for 64 and 131 stars, respectively.

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