Distance and metallicity limits of high-velocity clouds.

Details Distance and metallicity limits of high-velocity clouds. Distance and metallicity limits of high-velocity clouds.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..364s&link_type=abstract

Astronomy and Astrophysics, v.302, p.364

Astronomy and Astrophysics

Astrophysics

38

Scientific paper

This paper presents results of a program to derive distances of high-velocity clouds (HVCs) through measurement of absorption in the CaIIH and K lines. The problems of the method and their solutions are discussed in detail. A probable detection of absorption toward the Seyfert galaxy Mark106 is reported, which gives a Ca^+^ abundance of (17+/-6)x10^-9^ in HVC complex A. The non-detection of CaII absorption against a stellar probe sets a tentative lower limit of 1.6kpc to the distance of complex A. Non-detections of HVC CaII lines in 9 stars projected on complexes M, C and H may give distance limits, if the Ca^+^/HI ratio in those HVCs can be derived from absorptions against extra-galactic probes. High-resolution HI observations are required to get reliable Ca^+^ abundances. Westerbork HI synthesis observations are reported for several directions together with profiles obtained at the Effelsberg 100-meter dish. From results on several HVCs, we conclude that the Ca^+^/HI ratio may vary strongly between different HVC complexes.

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