Hostname: page-component-745bb68f8f-s22k5 Total loading time: 0 Render date: 2025-01-11T14:53:59.699Z Has data issue: false hasContentIssue false
  • English
  • Français

Distance and Chemical Composition of High-Velocity Clouds

Published online by Cambridge University Press:  12 April 2016

Hugo van Woerden ,
Ulrich J. Schwarz  and
Bart P. Wakker
Hugo van Woerden
Affiliation:
Kapteyn Astronomical InstitutePostbus 800, 9700AV Groningen, The Netherlands
Ulrich J. Schwarz
Affiliation:
Kapteyn Astronomical InstitutePostbus 800, 9700AV Groningen, The Netherlands
Bart P. Wakker
Affiliation:
Kapteyn Astronomical InstitutePostbus 800, 9700AV Groningen, The Netherlands

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

This contribution reports results of recent absorption-line studies on La Palma and reviews earlier work done elsewhere. CaII has been found in absorption in five HVCs, mostly against extragalactic background sources. The CaII/HI ratios differ strongly, from 0.002 to 0.1 times solar, suggesting different origins of HVCs. Nondetections of CaII absorption in stellar spectra may provide lower limits to HVC distances, or be caused by small-scale structure or a low CaII/HI ratio in the HVC. Proper interpretation requires comparison of CaII/HI ratios in stellar and extragalactic probes, and use of high-resolution HI maps. No solid direct distance determinations of HVCs are available yet. The distance of Complex C is controversial.

Type
VI. Interstellar Matter at High Galactic Latitudes
Information
International Astronomical Union Colloquium , Volume 120: Structure and Dynamics of the Interstellar Medium , 1989 , pp. 389 - 395
Copyright
Copyright © Springer-Verlag 1989

References

Adams, W.S., 1943, Astrophys. J. 97, 105 Google Scholar
Adams, W.S., 1949, Astrophys. J. 109, 354 Google Scholar
Albert, C.E. 1983, Astrophys. J. 272, 509 Google Scholar
Beals, C.S., 1936, Monthly Notices Roy. Astr. Soc. 96, 661 CrossRefGoogle Scholar
Blaauw, A., Tolbert, C.R., 1966, Bull. Astr. Inst. Neth. 18, 405 Google Scholar
Brown, P.J.F., Dufton, P.L., Keenan, F.P., Boksenberg, A., King, D.L., Pettini, M., 1989, Astrophys. J. 339, 397 Google Scholar
van de Hulst, H.C., 1953, Observatory 73, 129 Google Scholar
van de Hulst, H.C., Muller, C.A., Oort, J.H., 1954, Bull. Astr. Inst. Neth. 12, 177 Google Scholar
Morgan, W.W., Sharpless, S., Osterbrock, D.S., 1952, Astron. J. 57, 3 Google Scholar
Münch, G., 1953, Publ. Astron. Soc. Pacific 65, 179 Google Scholar
Münch, G., 1957, Astrophys. J. 125, 42 Google Scholar
Münch, G., and Zirin, 1961, Astrophys. J. 133, 11 CrossRefGoogle Scholar
Muller, C.A., Oort, J.H., Raimond, E., 1963, C.R. Acad. Sci. Paris 257, 166 Google Scholar
Oort, J.H. and Hulsbosch, A.N.M. 1978, in “Astronomical papers dedicated to Bengt Strömgren” (eds. Reiz, A. and Andersen, T.), Copenhagen Univ. Observatory, p. 409 Google Scholar
Pettini, M. 1986, private communicationGoogle Scholar
Pottasch, S.R., 1985, in “The Milky Way Galaxy”, (eds. Woerden, H. van, Allen, R.J., Burton, W.B.), IAU Symposium 106, p. 575 Google Scholar
Robertson, J.G., Schwarz, U.J., Van Woerden, H., Murray, J.D., Morton, D.C., Hulsbosch, A.N.M., 1989, in preparationGoogle Scholar
Schwarz, U.J., Wakker, B.P., Van Woerden, H. 1989, in preparationGoogle Scholar
Songaila, A., York, D.G., Cowie, L.L., Blades, J.C., 1985, Astrophys. J. 293, L15 Google Scholar
Songaila, A., Cowie, L.L., Weaver, H.F., 1988, Astrophys. J. 329, 588 CrossRefGoogle Scholar
Songaila, A., 1981, Astrophys. J. 243, L19 CrossRefGoogle Scholar
Van Woerden, H., Takakubo, K., Braes, L.L.E. 1962, Bull. Astr. Inst. Neth. 16, 321 Google Scholar
Van Woerden, H., Schwarz, U.J., Hulsbosch, A.N.M., 1985, in “The Milky Way Galaxy” (eds. Woerden, H. van, Allen, R.J., Burton, W.B.), IAU Symposium 106, 387 Google Scholar
Van Woerden, H., Schwarz, U.J., Robertson, J.G., Hulsbosch, A.N.M. 1986, in “Gaseous Haloes of Galaxies” (eds. Bregman, J.N. & Lockman, F.J.), Workshop no. 12, NRAO, pl26 Google Scholar
Wakker, B.P., 1989, this volumeGoogle Scholar
Wakker, B.P., Schwarz, U.J., 1989 in preparationGoogle Scholar
West, K.A., Pettini, M., Penston, M.V., Blades, J.C., Morton, D.C., 1985, Monthly Notices Roy. Astr. Soc. 215, 482 Google Scholar
Wesselius, P.R., Fejes, I., 1973, Astron. Astrophys. 24, 15 Google Scholar