The abundance of interstellar oxygen toward Orion: Evidence for recent infall?

Details The abundance of interstellar oxygen toward Orion: Evidence for recent infall? The abundance of interstellar oxygen toward Orion: Evidence for recent infall?

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437l..59m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 437, no. 1, p. L59-L61

Astronomy and Astrophysics

Astrophysics

72

Abundance, Interstellar Gas, Orion Nebula, Oxygen, Absorption Spectra, Hubble Space Telescope, Metallicity, Vapor Phases

Scientific paper

We present high S/N (greater than 800) Goddard High-Resolution Spectrograph (GHRS) observations of the weak interstellar O I lambda 1356 absorption in the low-density sight lines toward iota Ori and kappa Ori. By comparing these data with observations toward more reddened stars, we find no evidence of density-dependent depletion from the gas phase for oxygen. The derived total oxygen abundance (gas plus grains) towards iota Ori and kappa Ori is consistent with stellar and nebular determinations in Orion at a level that is one-half the solar value. We speculate that the O/H abundance ratio is lower in Orion compared to the Sun because the local Milky Way has suffered a recent infall of metal-poor material, perhaps from the Magellanic Stream.

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