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The radial pulsation of AI Aurigae
We present an analysis of eleven years of Strömgren by photometryof the red semiregular variable star AI Aurigae. An early perioddetermination of 63.9 days is confirmed by the long-term light curvebehaviour. The light curve shows semi-regular changes with a mean periodof 65 days reaching an amplitude of 0\fm6 in some cycles. The b-y colourchanges perfectly parallel the V light curve, suggesting radialoscillation to be the main reason for the observed variations. Weestimate the main characteristics of the star (mass, radius, effectivetemperature) that suggest radial pulsation in fundamental or firstovertone mode.
| The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
| An attempt to define luminosity criteria in O stars via narrow-band photoelectric photometry
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970AJ.....75..337L&db_key=AST
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