Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1634h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1634-1687.
Astronomy and Astrophysics
Astronomy
61
Astronomical Photography, Magellanic Clouds, Mira Variables, Cepheid Variables, Light Curve, Photographic Plates, Star Formation, Stellar Luminosity
Scientific paper
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 toward larger amplitudes and brighter luminosities with period, both of which should contribute to increase mass-loss rates. The period distribution falls abruptly longward of about 420 days and shortward of about 140 days, whereas the corresponding limits in the solar neighborhood are about 450 and about 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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