Carbon Abundances in Metal-Poor Dwarf Emission-Line Galaxies from HST Observations

Details Carbon Abundances in Metal-Poor Dwarf Emission-Line Galaxies from HST Observations Carbon Abundances in Metal-Poor Dwarf Emission-Line Galaxies from HST Observations

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18310811g&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #108.11; Bulletin of the American Astronomical Society, Vol. 25, p.1452

Astronomy and Astrophysics

Astronomy

Scientific paper

We present observations of UV emission lines of C III], O III] and Si III] from H II regions in dwarf galaxies, using the Faint Object Spectrograph on HST. The observation of these ionic species together in the UV spectrum allows us to derive the C/O and Si/O abundance ratios with only small dependences on electron temperature and interstellar reddening, a significant improvement over IUE observations. We find that the C/O ratio in the most metal-poor galaxies (with O/H less than one-tenth solar) is significantly smaller than the solar system ratio, by 0.5-0.6 dex. This is consistent with the C/O ratios found in high-redshift absorption line systems by Reimer et al. (1992, Nature, 360, 561). The Si/O abundance ratio appears to be constant in the dwarf galaxies but below the solar system ratio, consistent with greater depletion of silicon onto grains. The results from our small sample suggest that the C/O ratios in the most metal-poor galaxies are roughly consistent with Weaver and Woosley's (1992, Phys. Rep., 227, 65) best estimate of the (12}C(alpha ,gamma )({16)) O nuclear reaction rate.

Affiliated with

Also associated with

No associations

Rating

Carbon Abundances in Metal-Poor Dwarf Emission-Line Galaxies from HST Observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Carbon Abundances in Metal-Poor Dwarf Emission-Line Galaxies from HST Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carbon Abundances in Metal-Poor Dwarf Emission-Line Galaxies from HST Observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-781476