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.
Keywords
Cite
@article{arxiv.1004.2728,
title = {Photometry of two unusual A supergiant systems in the Small Magellanic Cloud},
author = {R. E. Mennickent and M. Smith and Z. Kołaczkowski and G. Pietrzyński and I. Soszyński},
journal= {arXiv preprint arXiv:1004.2728},
year = {2015}
}
Comments
To be published in Publications of the Astronomical Society of the Pacific (PASP).