SIMBAD references

2001ApJ...562..394C - Astrophys. J., 562, 394-399 (2001/November-3)

Space telescope imaging spectrograph observations of interstellar oxygen and krypton in translucent clouds.

CARTLEDGE S.I.B., MEYER D.M., LAUROESCH J.T. and SOFIA U.J.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): ISM: Dust, Extinction - ISM: Abundances

Status at CDS:  

Simbad objects: 28

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