Other
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop...19m&link_type=abstract
NOAO Proposal ID #2000A-0019
Other
Scientific paper
We propose to obtain high resolution observations of the interstellar Na I D absorption toward the bright cores of seven globular clusters and galaxies utilizing the 4 arcsec spatial sampling and 27 arcsec x 43 arcsec field of the DensePak fiber bundle in tandem with the WIYN telescope. Recent observations with this instrumentation have revealed that the intermediate-velocity halo cloud (IVC) toward the globular M15 exhibits significant small-scale structure with sixteenfold variations in the Na I column density across the DensePak field. Our proposed observations will determine if the small-scale Na I structure observed in the halo (and local) gas toward M15 is common in other sightlines through the Galactic halo. If such structure reflects H I and is common in other halo clouds, its impact on derived parameters like metallicity would have been missed in the highest resolution (~1 arcmin) H I 21 cm emission studies of these clouds. The maps of local ISM Na I structure toward our 7 targets will also provide an important two-dimensional perspective on the ubiquitous single-axis Na I variations observed toward nearby binary stars.
Lauroesch James Thomas
Meyer David M.
Roth Katherine C.
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