Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...477l..57c&link_type=abstract
Astrophysical Journal Letters v.477, p.L57
Astronomy and Astrophysics
Astronomy
48
Ism: Abundances, Ism: Atoms
Scientific paper
We present high signal-to-noise ratio HST Goddard High Resolution Spectrograph (GHRS) observations of the weak interstellar Kr I lambda 1236 absorption toward the stars tau CMa, kappa Ori, epsilon Ori, lambda Ori, delta Sco, omega 1 Sco, epsilon Per, and zeta Per. In combination with previous GHRS measurements of Kr I in two other sight lines ( zeta Oph and 1 Sco), these new observations yield a mean interstellar gas-phase krypton abundance (per 109 H atoms) of 109 Kr/H = 0.96 +/- 0.05. There is no statistically significant variation from sight line to sight line in the measured Kr I abundance and, in particular, no evidence for any correlation with the fraction of hydrogen in molecular form. Since Kr, as a noble gas, is not expected to deplete into dust grains, its gas-phase abundance should reflect the total interstellar abundance. Consequently, the GHRS observations imply that the interstellar Kr abundance in the vicinity of the Sun is about 60% of the solar system value of 109 Kr/H = 1.70 +/- 0.30. This interstellar abundance deficit is similar to that recently found for oxygen with GHRS.
Cardelli Jason A.
Meyer David M.
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