The distance to the Complex C of high-velocity halo clouds

Astronomy and Astrophysics – Astrophysics

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Interstellar Medium: Clouds, Structure, Galaxy: Halo, Structure, Ultraviolet: Interstellar

Scientific paper

High resolution IUE spectra of sdB and HBB stars in the direction of the concentration of neutral hydrogen gas at high-velocity named Complex C have been obtained. The interstellar absorption line profiles are compared with Effelsberg HI 21-cm emission profiles. Since the distances to the stars are known from spectroscopic investigations, firm lower limits can be derived for the distance of the gas with LSR radial velocity of about -110 km/s of Complex CIA and CIB. Including additional results from the literature we conclude that Complex C most likely has a z-height of at least 1.5 kpc.

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