Abstract We discuss the relevance of UV data in the detection and characterization of hot massive stars and young stellar populations in galaxies. We show results from recent extensive surveys in M31 and M33 with Hubble Space Telescope (HST) multi-wavelength data including UV filters, which imaged several regions at a linear resolution (projected) of less than half a pc in these galaxies, and from GALEX far-UV and near-UV wide-field, low-resolution imaging of the entire galaxies. Both datasets allow us to study the hierarchical structure of star formation: the youngest stellar groups are the most compact, and are often arranged within broader, sparser structures. The derived recent star-formation rates are rather similar for the two galaxies, when scaled for the respective areas. We show how uncertainties in metallicity and type of selective extinction for the internal reddening may affect the results, and how an appropriate complement of UV filters could reduce such uncertainties, and significantly alleviate some parameter degeneracies.
The role of ultraviolet imaging in studies of resolved and unresolved young stellar populations. M31 and M33
Advances in Space Research ; 53 , 6 ; 928-938
2013-01-01
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Some Resolved and Unresolved Areas in Journal Orbit Analysis
SAE Technical Papers | 1992
|Measuring Unresolved Surface Features Using Imaging Ellipsometric Polarization Signatures
British Library Conference Proceedings | 2002
|Unresolved mossbauer hyperfine spectra
NTRS | 1980
|Stellar Populations in Early-type Galaxies
British Library Online Contents | 1998
|