Chemical Abundances and Physical Parameters of H II Regions in the Magellanic Clouds
نویسندگان
چکیده
منابع مشابه
Measuring Chemical Abundances in Extragalactic Metal-Rich H II Regions
The analysis of metal-rich H ii regions has a profound impact on the calibration of abundance diagnostics widely used to measure the chemical content of star-forming galaxies, both locally and at high redshift. I review the main difficulties that affect direct abundance determinations from temperature-sensitive collisionally excited lines, and briefly discuss strong-line methods, in particular ...
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Aims. We present a study of the mid-infrared properties and dust content of a sample of 27 H ii “blobs”, a rare class of compact H ii regions in the Magellanic Clouds. A unique feature of this sample is that even though these H ii regions are of high and low excitation they have nearly the same physical sizes ∼1.5–3 pc. Methods. We base our analysis on archival 3 – 8 μm infrared imagery obtaine...
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The nebular properties (electronic density, extinction , age, O/H abundances) of H ii regions found along the bars of the sample of barred spiral galaxies studied by Martin & Friedli (1997) are examined. From line ratio diagnostic diagrams, it is showed that regions located along the major axis of the bars have a normal photoionization spectrum, that is, line ratios reproductible from nebular c...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1999
ISSN: 0074-1809
DOI: 10.1017/s0074180900118054