Six new compact triply eclipsing triples found with <i>TESS</i>

HD 181068: a red giant in a triply eclipsing compact hierarchical triple system.

Hierarchical triple systems comprise a close binary and a more distant component. They are important for testing theories of star formation and of stellar evolution in the presence of nearby companions. We obtained 218 days of Kepler photometry of HD 181068 (magnitude of 7.1), supplemented by ground-based spectroscopy and interferometry, which show it to be a hierarchical triple with two types ...

Automated analysis of eclipsing binary lightcurves. I. EBAS — a new Eclipsing Binary Automated Solver with EBOP

We present a new algorithm— Eclipsing Binary Automated Solver (EBAS), to analyse lightcurves of eclipsing binaries. The algorithm is designed to analyse large numbers of lightcurves, and is therefore based on the relatively fast EBOP code. To facilitate the search for the best solution, EBAS uses two parameter transformations. Instead of the radii of the two stellar components, EBAS uses the su...

. S R ] 1 0 Fe b 20 12 HD 181068 : A Red Giant in a Triply - Eclipsing Compact Hierarchical Triple System 1

Semimartingales in Locally Compact Abelian Groups and Their Characteristic Triples

The concepts of semimartingales and their characteristic triples are introduced for stochastic processes taking their values in a locally compact second countable abelian group. It is proved that the third characteristic always exists and that the first two characteristics always exist when the group is compact. Any continuous additive Gaussian process in a locally compact second countable abel...

Found : High Surface Brightness Compact Galaxies

We are using the 2dF spectrograph to make a survey of all objects (" stars " and " galaxies ") in a 12 deg 2 region towards the Fornax cluster. We have discovered a population of compact emission-line galaxies unresolved on photographic sky survey plates and therefore missing in most galaxy surveys based on such material. These galaxies are as luminous as normal field galaxies. Using Hα to esti...