High Spatial Resolution UV/Optical Spectroscopy of H II Regions in the Magellanic Clouds

Details High Spatial Resolution UV/Optical Spectroscopy of H II Regions in the Magellanic Clouds High Spatial Resolution UV/Optical Spectroscopy of H II Regions in the Magellanic Clouds

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8196g&link_type=abstract

HST Proposal ID #8196

Physics

Hst Proposal Id #8196 Interstellar And Intergalactic Matter

Scientific paper

We propose to obtain high signal/noise UV/optical spectra of several H II regions in the SMC with STIS to make definitive measurements of the abundances of C and N, and to study the temperature, density, and ionization structures of the nebulae at 10^17 cm resolution. We will measure gas-phase C/O and N/O ratios from UV emission lines of C III, N III, and O III, which can provide very reliable abundance determinations. The new C/O and N/O measurements will be used to address apparent discrepancies between C and N abundances in the H II regions and those derived in luminous stars in the Clouds. N III measurements will provide the first reliable N abundances in the Clouds, and resolve disagreements between optical and IR abundance determinations. We will look at the magnitude of spatial variations in C/O and N/O to study the efficiency of mixing of PN ejecta in the ISM. Measurements of Si III Lambda1883 will yield accurate Si/O ratios and a better understanding of grain depletions in a variety of environments. Our H II region sample overlaps that of an ISO IR spectroscopy program, which will provide complementary information on several ions not observable in the optical/UV spectrum. High spatial resolution mapping of physical conditions and ionization will enable us to develop photoionization models of greatly improved accuracy for the Magellanic Cloud regions.

Affiliated with

Also associated with

No associations

Rating

High Spatial Resolution UV/Optical Spectroscopy of H II Regions in the Magellanic Clouds 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 High Spatial Resolution UV/Optical Spectroscopy of H II Regions in the Magellanic Clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High Spatial Resolution UV/Optical Spectroscopy of H II Regions in the Magellanic Clouds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-992840