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

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

2010-04-15

arxiv.org/abs/1004.2728v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

To be published in Publications of the Astronomical Society of the Pacific (PASP).

Scientific paper

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.

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