========================================================================== J/ApJ/660/1486 Variability of LMC semiregular variables (Soszynski+, 2007) The following files can be converted to FITS (extension .fit or fit.gz) stars.dat table1.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/ApJ/660/1486 ==========================================================================
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Beginning of ReadMe : J/ApJ/660/1486 Variability of LMC semiregular variables (Soszynski+, 2007) ================================================================================ Long secondary periods and binarity in red giant stars. Soszynski I. <Astrophys. J., 660, 1486-1491 (2007)> =2007ApJ...660.1486S ================================================================================ ADC_Keywords: Magellanic Clouds ; Stars, variable ; Stars, giant Keywords: binaries: close - planetary systems - stars: AGB and post-AGB Abstract: Observational arguments supporting the binary explanation of the long secondary period (LSP) phenomenon in red giants are presented. Photometry of about 1200 semiregular variables with LSPs in the Large Magellanic Cloud is analyzed using the MACHO and OGLE photometry. For about 5% of these objects, additional ellipsoidal-like or eclipsing-like modulation with the same periods as the LSP is detectable. These double-humped variations are usually shifted in phase compared to LSP light curves. I discuss the model of a binary system with a red giant as the primary component and a low-mass object as the secondary. The mass lost by the red giant through the wind follows a spiral pattern in the orbit around the primary star and obscures it, causing LSP variations. Description: Merged light curves from both projects covered 15yr of observations, from 1992 to 2006. The sequence D stars selected by Soszynski et al. (2004, Cat. J/AcA/54/347) in the OGLE database were cross identified with objects collected in the MACHO archive.