Results from UBVRI optical photometric observations of the pre-main sequence star V350 Cep during the period 2004-2014 are presented in the paper. The star is discovered in 1977 due to the remarkable increase in brightness with more than 5 mag (R). In the previous studies V350 Cep is considered a potential member of the groups of FUors or EXors eruptive variables. Our data suggest that during the period of observations the star keeps its maximum brightness with low amplitude photometric variations. Our conclusion is that V350 Cep is probably an intermediate object between FUors and EXors, similar to V1647 Ori.
We present Kepler and Swift observations of StHa 169 which is currently classified as a symbiotic binary. The Kepler light curve shows quasi periodic behaviour with a mean period of 34 d and an amplitude of a few percent. Using Swift data we find a relatively strong UV source at the position of StHa 169 but no X-ray counterpart. Using a simple two component blackbody fit to model the combined Swift and 2MASS spectral energy distribution and an assessment of the previously published optical spectrum, we find that the source has a hot (~10,000K) component and a cooler (~3700K) component. The Kepler light is dominated by the cool component and we attribute the variability to pulsations in a red giant star. If we remove this approximate month long modulation from the light curve, we find no evidence for additional variability in the light curve. The hotter source is assigned to a late B or early A main sequence star. We briefly discuss the implications of these findings and conclude that StHA 169 is a red giant plus main sequence binary.
Authors: Gavin Ramsay (Armagh Observatory), Pasi Hakala (FINCA), Steve Howell (NASA Ames)
Early last century, Bates spent 16 years living among the people of South Australia's Great Victoria Desert, recording their language, customs, and oral traditions, according to one of the study's authors, Dr Duane Hamacher of the University of New South Wales.
Hamacher and co-author Trevor Leaman collected Bates' published accounts and journal entries as part of an ongoing project to develop a complete picture of Aboriginal sky knowledge and star lore.
We present a study of OGLE light curves of red giant stars exhibiting long secondary periods (LSPs) - an enigmatic phenomenon commonly observed in stars on the upper red giant branch and asymptotic giant branch. We show that the light curves of LSP stars are essentially identical to those of the spotted variables with one dark spot on their photospheres. Such a behavior can be explained by a presence of a dusty cloud orbiting the red giant together with a low-mass companion in a close, circular orbit. We argue that the binary scenario is in agreement with most of the observational properties of LSP variables, including non-sinusoidal shapes of their radial velocity curves.