Statistics – Computation
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980s%26t....59..287h&link_type=abstract
Sky and Telescope, vol. 59, Apr. 1980, p. 287-291.
Statistics
Computation
Astronomical Photography, Galactic Evolution, Spiral Galaxies, Star Distribution, Astronomical Maps, Dwarf Stars, Globular Clusters, Hydrogen Clouds, Interstellar Gas, Milky Way Galaxy, Stellar Mass, Variable Stars
Scientific paper
The discovery, characteristics and probable origin and evolution of the dwarf galaxies are reviewed. The detection of the Sculptor dwarf galaxy by Shapley in 1937 is discussed, and the seven known objects of this class are described as resembling very diffuse large globular clusters, found predominantly at high galactic latitudes. Dwarf spheroidals are shown to exhibit many of the characteristics of old Population II objects, and to be subject to the sweeping out of all interstellar matter by supernova explosions and tidal disruption by neighboring larger galaxies, due to their small total mass and the sparseness of their stars. RR Lyrae variables have been found to be the most populous type of variable in the dwarf spheroidals, with the less common Cepheids exhibiting an anomalous period-luminosity relation. It is proposed that these anomalous Cepheids have higher luminosities than conventional Population II Cepheids because of higher masses, which possibility is reconciled to the longer lifetimes of dwarf galaxy members, by the argument that the anomalous variables are members of binary systems in which return transfer of mass accreted from the larger to the smaller does not occur. Computations of stellar lifetimes also suggest that the dwarf spheroidals formed several billion years after the collapse of the cloud which became the Milky Way.
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