Surveys for long-period variables in the MagellanicWith the advent of the IRAS satellite, many point sources were found in the Magellanic Clouds. Some of the most luminous optically visible LPVs (including objects found on I plates) were detected by IRAS, but many of the IRAS point sources have no optical counterparts. The colours of some of these IRAS sources indicate that they may be variable OH/IR stars, and a number of them have been monitored in the near infrared (JHK); some variable sources have been found by Whitelock et al (1989) in the SMC and by Wood et al (1990) in the LMC and SMC.
Infrared photometryTo derive useful quantities such as M bo j and T e ff (estimates), infrared JHK photometry is required for the LPVs. Such photometry can be found in papers by Glass
ABSTRACT. A search for long period variables in the Small Magellanic Cloud (SMC) was made using I plates from the U.K. Schmidt telescope. Variables were identified using a blink comparator built specially for this project and plates were digitised to determine periods and light curves for suspected variables. Over 300 new variables with periods in excess of 100 days were found, some variables having periods in excess of 1000 days.
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