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

Abstract

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.

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

Cited by in corpus (4)

• The optically bright post-AGB population of the LMC
• Variability of Massive Stars with Known Spectral Types in the Small Magellanic Cloud Using 8 Years of OGLE-III Data
• High dispersion spectroscopy of two A supergiant systems in the Small Magellanic Cloud with novel properties
• On the eclipsing binary ELHC 10 with occulting dark disc in the Large Magellanic Cloud