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Showing 1 to 9 of 9 for “"H II regions"”.
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Starbursts in extragalactic giant H II regions
Extragalactic giant H II regions (EGHRs) are sites of active, concentrated star formation on manageable scales, and thus provide ideal labs to analyze starburst phenomena. To get a complete picture of the starburst phenomenon, the critical characteristics we must investigate include star formation …
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Star Formation in OB Associations and Clusters
… mass functions (PDMFs) of four star formation regions do not have obvious variations and are shallower than those of field regions. The PDMFs of field stars indicates that star formation varies from location to location; therefore, assumptions made for converting PDMFs to IMFs have to be …
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Global and Local Properties of Noninteracting Irregular Galaxies
… small aperture spectrophotometry of individual H II regions, and H I 21-cm observations. The gas and abundance parameters, combined with other derived quantities such as the SFR, the fraction of a galaxy involved in the current star forming activity, and the time scale to exhaust the gas, were …
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Spatially-resolved studies of nearby star-forming galaxies
… spiral galaxies. I map various properties of H II regions and the surrounding gas within three BCDs, using integral field spectroscopic (IFS) data from the Gemini Multi-Object Spectrograph-North. While answering questions related to chemical homogeneity, ionisation mechanisms and stellar …
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Radio & Infrared Observations of the W3/W4/W5 Star-forming Regions
… (LOFAR) Surveys KSP, targeted observations of H II regions close to high mass star-forming regions in the Galactic plane have been conducted, as part of the telescope’s commissioning. This thesis details the calibration and analysis of one particular commissioning field, the prominent Galactic …
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Chemical abundances in planetary nebulae in NGG 6822
… spectra of five planetary nebulae and two H II regions are presented. The nebulae, located in NGC 6822, a Local Group Irregular Galaxy at a distance of .557 Mpcs, were examined using the Richey-Cretien spectrograph and the Silicon Intensified (SIT) Vidicon, on the 4-meter telescope at the …
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Partial Radiative Recombination Cross Sections for Excited States of Hydrogen
… recombination cross sections for interstellar H II regions usually only the electric dipole term in the expansion of the interaction Hamiltonian is kept. However, conditions present in these regions permit recombination into highly excited states and the "effective size" of the atom is not much …
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Multi-dimensional simulations of bow shocks of massive, high-velocity runaway stars
… ISM phases: the hot ionized medium (HIM), H II regions (HII), warm neutral medium (WNM) and cold neutral medium (CNM). We demonstrate that the star's evolutionary phase; ISM phase; relative space velocity; thermal conduction and radiative cooling/heating, all have significant impact on the …
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A Pathway to EMU: the SCORPIO Project
… MeerKAT. All this surveys will observe large regions of the sky at high sensitivity, providing a huge increase in known object. This thesis focuses on radio stars and the science that can be carried out with the new radio interferometers. Even if, in general, stars emit in radio a small …