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

G. Pietrzy\'nski; I. Soszy\'nski; M. Smith; R.E. Mennickent; Z. Ko{\l}aczkowski

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

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arxiv 1004.2728 v1 pith:LLYPP2HR submitted 2010-04-15 astro-ph.SR

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

R.E. Mennickent , M. Smith , Z. Ko{\l}aczkowski , G. Pietrzy\'nski , I. Soszy\'nski This is my paper

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keywords photometrysmc-sc3associateddayssmc-sc4alongbinariesbright

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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.

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

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