Astronomy and Astrophysics, volume 338, 200-208 (1998/10-1)
Westerbork HI observations of two High-Velocity Clouds.
STOPPELENBURG P.S., SCHWARZ U.J. and VAN WOERDEN H.
Abstract (from CDS):
Westerbork HI synthesis observations are presented for the directions of the stars 4 Lac and HD 135485. Interstellar absorption lines at high velocities had been reported in the UV spectrum of 4 Lac, setting an upper limit of 1.2kpc on the distance of the associated, small HI cloud (Bates et al. 1990MNRAS.242..267B
). The Westerbork observations show that this cloud (l=100°, b=-7°, vLSR
=+100km/s), which must have a high velocity relative to the surrounding disk gas, consists of two small condensations; the observations provide constraints on their mass and density, and indicate that the metallicity of this cloud is close to solar. For HD 135485, Albert et al. (1993ApJS...88...81A
) had found high-velocity absorption lines in optical spectra, but later reports indicate that these lines are probably circumstellar. The Westerbork observations around HD 135485 show that the HI found here is part of a larger HVC complex, Complex L, described by Wakker & van Woerden (1991A&A...250..484W
). For both objects, the Westerbork results are compared with Jodrell Bank single-dish observations.
ISM: clouds - Radio lines: ISM - ISM: individual objects: HVC 100-7+100, HVC 347+35-112
Complex L is [H68] L
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