Space Telescope Imaging Spectrograph Observations of Interstellar Oxygen and Krypton in Translucent Clouds

Details Space Telescope Imaging Spectrograph Observations of Interstellar Oxygen and Krypton in Translucent Clouds Space Telescope Imaging Spectrograph Observations of Interstellar Oxygen and Krypton in Translucent Clouds

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...562..394c&link_type=abstract

The Astrophysical Journal, Volume 562, Issue 1, pp. 394-399.

Astronomy and Astrophysics

Astronomy

49

Ism: Dust, Extinction, Ism: Abundances

Scientific paper

We have obtained high-resolution Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) observations of O I λ1356 and Kr I λ1236 absorption in 11 sight lines characterized by high extinction, large H I column densities, and/or long path lengths. Previous Goddard High Resolution Spectrograph (GHRS) measurements of these weak features in seven relatively nearby diffuse clouds have shown no evidence for density-dependent depletion of either oxygen or krypton and have yielded a weighted mean gas-phase abundance ratio of log[N(O)/N(Kr)]GHRS=5.56+/-0.04. Our STIS measurements yield a lower weighted mean of log[N(O)/N(Kr)]STIS=5.48 the difference is due primarily to several translucent sight lines in the STIS data set that diverge from the GHRS value. These translucent cloud sight lines pass near dense, star-forming regions, notably the ρ Oph, Orion, and Taurus molecular clouds. Since Kr, as a noble gas, should not be depleted much into grains, these cases suggest a trend toward the enhanced oxygen depletion predicted for denser ISM clouds. Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555.

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