Physics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........4s&link_type=abstract
Ph.D. Thesis Michigan Univ., Ann Arbor.
Physics
1
Open Clusters, Spectral Emission, Stellar Color, Stellar Luminosity, Stellar Spectra, Supergiant Stars, Asymptotic Giant Branch Stars, Magellanic Clouds, Mass Distribution, Stellar Evolution
Scientific paper
Superluminous giant stars (SLGs) have been reported in young globular clusters in the Large Magellanic Cloud (LMC). These stars appear to be in the post asymptotic giant branch phase of evolution. This program was an investigation of galactis SLG candidates in open clusters, which are more like the LMC young globular clusters. These were chosen because luminosity, mass, and age determination can be made for members since cluster distances and interstellar reddenings are known. Color magnitude diagrams were searched for candidates, using the same selection criteria as for SLGs in the LMC. Classification spectra were obtained of 115 program stars from McGraw-Hill Observatory and of 68 stars from Cerro Tololo Inter-American Observatory in Chile. These stars were visually classified on the MK system using spectral scans of standard stars taken at the respective observations. A total of 62 objects were found to be of high luminosity and to warrant further investigations. Seven stars were monitored over a 90 day period for luminosity variations. These observations were analyzed to measure radial velocities and to detect emission features.
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