Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9096m&link_type=abstract
HST Proposal ID #9096
Computer Science
Hst Proposal Id #9096 Stellar Populations
Scientific paper
Most of the present knowledge of the UV spectral properties of massive young clusters {MYCs} is based on IUE data with marginal spatial resolution. We propose to greatly improve the spatial information by obtaining STIS NUV-MAMA objective-prism spectroscopy in the 1300-3600 Angstrom range of three nearby extragalactic regions with a total of 10 MYCs. Slitless techniques are seldom attempted on crowded clusters due to the overlap among different sources. We plan to overcome that problem by observing with two different roll angles, using comparison UV and optical images from the HST archive, and developing automatic extraction techniques based on codes already written by some of the authors. Some of the issues that will be tackled include: {i} Is there an age difference between the core and the outer parts of the clusters? {ii} What is the importance of differential extinction in the estimation of the cluster age? {iii} Is the absence of the 2175 Angstrom bump in starbursts due to geometrical effects or is it an intrinsic property of the dust? {iv} Are the properties of the dust homogeneous or do they vary with position? The STIS NUV prism is ideal for this type of study since it provides relatively higher spectral resolution for the features around 1500 Angstrom and lower resolution at longer wavelengths, where the sources are generally less intense and the background is higher.
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