Abstract
We present a photometric investigation in the uvbyβ system of a 20° × 20° field centered at galactic coordinates (l, b) = (105°, 5°). This region contains a relatively isolated structure of numerous HII regions in the direction of some of the OB associations in Cepheus and Cassiopeia. Photoelectric uvbyβ data of more than 220 stars of spectral types O-B9 are available for this field and are used to obtain homogeneous distance estimates for a number of prominent stellar groups, among which are the Cep OB2 and Cep OB3 associations and the open clusters NGC 7243 and NGC 7654.
Highlights
The field between 95 ̊ and 116 ̊ galactic longitude and −5 ̊ and 15 ̊ galactic latitude contains numerous HII regions
Several OB associations have been identified in this direction (Cep OB1, Cep OB2, Cep OB3, Cep OB5 and Cas OB2), some of which are well studied in terms of broad-band photometry
The diagrams color excess E(b − y) vs. true distance modulus (DM), dereddened visual magnitude V0 vs. dereddened color index. (b − y)0, and MV vs. (b − y)0 are presented in Figures 2 and 3 and are used to identify spatially coherent features in the studied coordinate range
Summary
The field between 95 ̊ and 116 ̊ galactic longitude and −5 ̊ and 15 ̊ galactic latitude contains numerous HII regions. Several OB associations have been identified in this direction (Cep OB1, Cep OB2, Cep OB3, Cep OB5 and Cas OB2), some of which are well studied in terms of broad-band photometry (see Humphreys [1] and the references therein). The goal of this investigation is to provide homogeneous distance and reddening estimates for as many young stars as possible in the studied coordinate range. This study is aimed to provide the basis for a further detailed investigation of the interaction between the OB stars and the interstellar medium for this field
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