Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...338..200s&link_type=abstract
Astronomy and Astrophysics, v.338, p.200-208 (1998)
Astronomy and Astrophysics
Astrophysics
10
Ism: Clouds, Radio Lines: Ism, Ism: Individual Objects: Hvc 100-7+100, Hvc 347+35-112
Scientific paper
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 1.2 kpc on the distance of the associated, small HI cloud (Bates et al. 1990, 1991). The Westerbork observations show that this cloud (l = 100() o, b = - 7() o, v_LSR +100 km s(-1) ), 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. (1993) 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 (1991). For both objects, the Westerbork results are compared with Jodrell Bank single-dish observations.
Schwarz Ulrich J.
Stoppelenburg P. S.
van Woerden Hugo
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