Interstellar TI II Observations Toward Southern Galactic Halo Stars

Details Interstellar TI II Observations Toward Southern Galactic Halo Stars Interstellar TI II Observations Toward Southern Galactic Halo Stars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.5407a&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #54.07; Bulletin of the American Astronomical Society, Vol. 25, p.892

Astronomy and Astrophysics

Astronomy

Scientific paper

We present observations of interstellar absorption in the galactic halo by the lambda 3384 line of Ti II toward distant southern OB stars. The data were obtained with the CTIO 1.5 m telescope and increase significantly the number of Ti II detections toward halo stars located more than one kiloparsec from the galactic plane. Since singly ionized Titanium is the dominant ionization stage in H I regions and since the lambda 3384 line is generally unsaturated, this species provides a unique opportunity to trace the extent and depletion of neutral gas in the halo. Preliminary results indicate that the projected column density, N(Ti II)sin(b), continues to increase out to the most distant star in our sample, at z=8.7: kpc. Observations toward extragalactic sources are needed to determine the scale height of neutral halo gas.

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