Interstellar CA II absorption toward early-type stars at high Galactic latitudes

Details Interstellar CA II absorption toward early-type stars at high Galactic latitudes Interstellar CA II absorption toward early-type stars at high Galactic latitudes

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192..295k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 295-298. SERC-supported research.

Astronomy and Astrophysics

Astrophysics

14

Astronomical Coordinates, Calcium, Early Stars, Interstellar Extinction, Interstellar Gas, Absorption Spectra, Astronomical Spectroscopy, B Stars, Halos, Stellar Spectra

Scientific paper

New high resolution AAT and INT observations of the Ca II 3933 Å interstellar line towards nine early-type stars at high galactic latitudes are presented. These are combined with the authors' earlier AAT data to investigate the distribution of Ca II in the galactic halo. A comparison of these results with Ca II equivalent widths for extragalactic sightlines implies that there is a significant amount of this ion out to z ≅ 1 kpc, but not much beyond z ≅ 2 kpc. No coincident high velocity Ca II absorption is detected in the spectra of stars near known high velocity clouds (HVC). Although this may indicate that the HVCs are either at greater distances than the stars or have angular extents smaller than the separations of the stellar and HVC sightlines, it is also possible that they are nearby but contain too little Ca II to produce an observable absorption line.

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