Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...535..293p&link_type=abstract
The Astrophysical Journal, Volume 535, Issue 1, pp. 293-297.
Astronomy and Astrophysics
Astronomy
1
Ism: Kinematics And Dynamics, Line: Profiles, Stars: Individual: Henry Draper Number: Hd 22252
Scientific paper
We report new observations of Na I and Ca II interstellar absorption in a nearby (230+/-30 pc) southern high-latitude filament obtained at a spectroscopic resolution of ~0.32 km s-1 using HD 22252 as the background probe. Complex absorption is present for both species with total column densities of N(Ca II)~1.3×1012 cm-2 and N(Na I)>7×1012 cm-2. Over a velocity range of 25 km s-1 we find 11 Ca II velocity components loosely grouped into three velocity aggregates. Unusually narrow Ca II absorption is present with b-values in the range 0.25-0.5 km s-1 such small values are rarely discovered. Each of these narrow Ca II components has an associated broader component at a slightly shifted velocity. Finally, there are two Ca II clouds with large b-values (~5 km s-1) but no detectable Na I that flank the three aggregates. At our particular intercept we may be observing the filament edge-on and seeing cold interior condensations each with a warm outer shell-all contained within a further exterior envelope of ionized gas. We estimate that a typical interior condensation will have a linear dimension d in the range 104
Blades Chris J.
Penprase Bryan Edward
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