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Distance and Metallicity of HVCs

Published online by Cambridge University Press:  25 May 2016

B.P. Wakker ,
H. van Woerden ,
U.J. Schwarz ,
R.F. Peletier ,
N.G. Douglas ,
L. Danly  and
K.S. de Boer
B.P. Wakker
Affiliation:
University of Illinois, Urbana, USA
H. van Woerden
Affiliation:
Kapteyn Institute, Rijks Universiteit Groningen, NL
U.J. Schwarz
Affiliation:
Kapteyn Institute, Rijks Universiteit Groningen, NL
R.F. Peletier
Affiliation:
Kapteyn Institute, Rijks Universiteit Groningen, NL
N.G. Douglas
Affiliation:
Kapteyn Institute, Rijks Universiteit Groningen, NL
L. Danly
Affiliation:
STScI, Baltimore MD, USA
K.S. de Boer
Affiliation:
Universität Bonn, Germany

Extract

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Table 1 summarizes results of programs to determine distances and metallicities of high-velocity clouds (HVCs, see Wakker 1991, IAU Symp 144, 27 for a general review). Reliable absorption is reported for one stellar probe (BD+38 2182), giving a distance D<5kpc for complex M. Other results are controversial (BT Dra), uncertain(HD 135485) or atypical (4 Lac). Non-detections reported by e.g. Lilienthal et al. (1990, A&A 240, 287), Danly et al. (1992, ApJS 81, 125) and de Boer et al. (1994, A&A 286, 925), yield lower limits up to 2 kpc for complexes A, C and M. Absorption by heavy elements in HVCs is reported for twelve extra-galactic probes. All absorptions reported in HVCs with |v LSR| > 90km/s are given in the table (abundances are from low-resolution HI data and thus uncertain).

Type
Chapter 7: How are we to Understand the Small Scale Structure of the ISM?
Information
Symposium - International Astronomical Union , Volume 169: Unsolved Problems of the Milky Way , 1996 , pp. 605 - 606
Copyright
Copyright © Kluwer 1996 

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