Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5010d&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #50.10; Bulletin of the American Astronomical Society, Vol. 26, p.1394
Other
Scientific paper
We present high-resolution, high signal-to-noise spectra of the interstellar Na I and Ca II lines toward 7 stars in the direction of the Vela supernova remnant. We show that high velocity gas with a complex velocity structure exists toward these stars. The Ca II to Na I ratio generally increases as a function of velocity, but we find that there is a decrease of about 0.5 dex in the logarithmic ratio of these species near 100 km sec(-1) . Several of the highest velocity components observed have unusually small values of N(Ca II)/N(Na I) compared to moderate velocity components and provide interesting counter-examples to the 'Routly-Spitzer' effect. These high velocity components probably trace sites of post-shocked gas in which pre-existing dust grains have not been destroyed. We have detected time variability in the absorption lines toward two stars, and in at least one case (the =~ +190 km sec(-1) feature toward HD 72997) we also see systematic velocity shifts in the both the Na I and Ca II lines. These velocity shifts indicate that the gas is being accelerated at the rate of =~ +1 km sec(-1) yr(-1) . The high velocity gas distribution toward three stars in the sample separated by less than 6 arc minutes is consistent with an origin resulting from dynamical events other than the initial explosion that resulted in PSR 0833-045.
Danks Anthony C.
Sembach Kenneth Russell
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