Star Clusters and CNO Abundances in Blue Compact Galaxies with Extremely Low Oxygen Abundance

Details Star Clusters and CNO Abundances in Blue Compact Galaxies with Extremely Low Oxygen Abundance Star Clusters and CNO Abundances in Blue Compact Galaxies with Extremely Low Oxygen Abundance

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5408t&link_type=abstract

HST Proposal ID #5408

Computer Science

Hst Proposal Id #5408 Galaxies &Amp, Clusters Evolution/Cosmology

Scientific paper

WE PROPOSE TO OBTAIN HIGH-RESOLUTION IMAGING, UV AND OPTICAL SPECTROSCOPY OF THREE OF THE MOST METAL-DEFICIENT BLUE COMPACT GALAXIES (BCG) IN THE SECOND BYURAKAN OBJECTIVE PRISM SURVEY, SBS 0125-065 (Z=Z(ORION)/22), SBS 0335-052 (Z=Z(ORION)/30) AND SBS 1415+437 (Z=Z(ORION)/20). THE HIGH-RESOLUTION IMAGING WILL ALLOW TO DETERMINE THE SIZES (OR UPPER LIMITS), LUMINOSITIES AND COLORS OF THE IONIZING STAR CLUSTERS. DOES THE TREND TOWARDS MORE MASSIVE AND LARGER STAR CLUSTERS SEEN IN MODERATELY METAL- DEFICIENT IRREGULAR GALAXIES CONTINUE TOWARD EXTREMELY METAL- DEFICIENT BCGS? THESE OBSERVATIONS WILL PUT CONSTRAINTS ON THEORIES OF GAS COLLAPSE AND FRAGMENTATION IN LOW-METALLICITY ENVIRONMENTS. THEY WILL ALSO ALLOW US TO STUDY THE ENVIRONMENT OF THESE STAR CLUSTERS: IS THERE AN UNDERLYING OLD STELLAR POPULATION CO-EXISTENT WITH THE YOUNG STELLAR POPULATION? ARE THERE VISIBLE SIGNS OF A STELLAR WIND? THE UV AND OPTICAL SPECTROSCOPY WILL ALLOW TO DERIVE ACCURATE CNO ABUNDANCES. THESE MEASUREMENTS WILL CONSTRAIN POSSIBLE FORMATION AND CHEMICAL EVOLUTION SCENARIOS AND SHED LIGHT ON THE QUESTION OF WHETHER BCGS ARE YOUNG OR OLD GALAXIES.

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