Improving our understanding of SRC variable stars

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dc.contributor.advisor Turner, David Gerald, 1945-
dc.creator Moncrieff, Kathleen Elizabeth 2012-01-25T17:56:38Z 2012-01-25T17:56:38Z 2011
dc.identifier.other QB835 M682 2011
dc.description xxiii, 410 leaves : ill. ; 29 cm. en_CA
dc.description Includes abstract.
dc.description Includes bibliographical references (leaves 111-118).
dc.description.abstract SRC variables are evolved stars (mostly M supergiants) that vary in brightness with semi-regular periods ranging from several months to several years. Their light variation is caused by a combination of pulsation, convection, and other processes such as dust ejections. Much data exist for the stars, but they have been under-utilized. We studied 49 individual SRC variables using archival and newly-obtained data. We present new results including cyclic variation in radial velocity, spectral type, and luminosity class, period analysis, and changes in period and mean magnitude for individual stars. We have re-examined the period-luminosity and period-radius relations, and discovered a new relationship among spectral type, luminosity class, and light amplitude. To aid in future studies of the stars, we have subdivided them into three categories based on the quality of available data and the likelihood that they are periodic rather than simply varying irregularly. en_CA
dc.description.provenance Submitted by Dianne MacPhee ( on 2012-01-25T17:56:38Z No. of bitstreams: 0 en
dc.description.provenance Made available in DSpace on 2012-01-25T17:56:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2011 en
dc.language.iso en en_CA
dc.publisher Halifax, N.S. : Saint Mary's University en_CA
dc.subject.lcc QB835
dc.subject.lcsh Variable stars
dc.title Improving our understanding of SRC variable stars en_CA
dc.type Text en_CA Doctor of Philosophy in Astronomy Doctoral Astronomy and Physics Saint Mary's University (Halifax, N.S.)
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