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Photometry of two unusual A supergiant systems in the Small Magellanic Cloud

We present multiwavelength broadband photometry and V, I time resolved photometry for two variable bright stars in the SMC, OGLE004336.91-732637.7 (SMC-SC3) and OGLE004633.76-731204.3 (SMC-SC4). The light curves span 12 years and show long-term periodicities (SMC-SC3) and modulated eclipses (SMC-SC4) that are discussed in terms of wide-orbit intermediate mass interacting binaries and associated envelopes. SMC-SC3 shows a primary period of 238.1 days along with a complicated waveform suggesting ellipsoidal variablity influenced by an eccentric orbit. This star also shows a secondary variability with an unstable periodicity that has a mean value of 15.3 days. We suggest this could be associated with nonradial pulsations.

preprint2010arXivOpen access
R. E. MennickentM. SmithZ. KołaczkowskiG. PietrzyńskiI. Soszyński
astro-ph.SR
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R. E. MennickentM. SmithZ. KołaczkowskiG. PietrzyńskiI. Soszyński

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