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2000 Å UV imaging of A 6° diameter field around theh and Chi Persei double cluster

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Abstract

The stellar field centred close to theh and χ Per double cluster is one of the 123 fields recorded in the galactic plane at 2000 Å by the balloon-borne stratospheric gondola of the SCAP-2000 programme. The analysis of the frame allows us to determine an ultraviolet colour indexU 1-V for more than 600 stars. Among these are stars belonging to theh and χ Per and Tr 2 clusters and to the PER OB1 association. The prevailing extinction law is found to produce greater extinction at 1965 Å than predicted by the mean extinction law. Moreover, the clouds responsible for the extinction are situated in the local arm and distributed in two layers with a very transparent interval. The comparison of theA v extinction and theHI and CO abundances leads us to assume the presence of a H2 cloud in front ofh and χ Per, in the second absorbing layer and, therefore, in the local arm. The two absorbing layers and the molecular cloud are perhaps in the plane of the Gould belt and associated with the expanding gas detected by Lindblad. A group of hot stars centred at the same distance as this molecular cloud has been detected and could form an association of OB stars in the local arm. Other, much more distant OB stars belonging to the Perseus arm of Efremov's list. Several stars which must have a very hot companion are detected in the field.

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  1. Observatoire de Genève, Sauverny, Switzerland

    M. Golay, X. Rabattu, N. Cramer & D. Huguenin

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Golay, M., Rabattu, X., Cramer, N. et al. 2000 Å UV imaging of A 6° diameter field around theh and Chi Persei double cluster. Astrophys Space Sci 147, 1–67 (1988). https://doi.org/10.1007/BF00656607

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