Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8096k&link_type=abstract
HST Proposal ID #8096
Computer Science
Hst Proposal Id #8096 Interstellar And Intergalactic Matter
Scientific paper
We have recently identified a B-type supergiant, LS 4825, which lies on the far side of the Galaxy, at a Galactocentric distance of R_G = 12 kpc, and whose sightline passes within 1 kpc of the Galactic Center. Optical ionCa2 and ionNa1 interstellar observations of LS 4825 reveal a miriad of intermediate and high velocity clouds, several of which arise from gas near to and beyond the Galactic Center. We now propose to obtain medium resolution STIS spectra, primarily to observe the ultraviolet interstellar lines towards LS 4825. These data will allow us to determine the abundances of important elements such as Mg, Si, S, Cr, Mn, Fe, and Zn {and possibly C, N, and O} in interstellar gas as a function of Galactocentric distance, from the Solar position all the way in to the Galactic Center and beyond, which is vital for testing the competing models for the chemical evolution of our Galaxy. A secondary aim of the STIS observations will be to study the ultraviolet stellar absorption lines in LS 4825, which will provide reliable element abundances for this star, and hence the chemical composition of the interstellar medium at R_G = 12 kpc on the far side of the Galaxy. This will be compared with results at R_G = 12 kpc on the near side, to investigate the azimuthal dependence of the Galactic abundance gradient.
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