Long-period variables in the Large Magellanic Cloud. I - Search and discovery

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Abstract
A search for long-period variables has been made in the bar and southern regions of the LMC using a series of I band UKST plates, resulting in the discovery of 471 Mira variables and 572 SRa variables. By using mainly automated methods of determining periods and amplitudes of variability, corrections for incompleteness have been estimated. The Miras show a trend towards larger amplitudes and brighter luminosities with period, both of which should contribute to increased mass-loss rates. The period distribution falls abruptly longward of ~420 days and shortward of ~140 days, whereas the corresponding limits in the solar neighborhood are ~450 and ~220 days, suggesting different histories of star formation in the LMC and the Galaxy. In particular, there appear to be relatively more old stars in the LMC.

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