BVRI PHOTOMETRIC 2015 WD ANALYSIS OF THE SOUTHERN TOTALLY ECLIPSING, SOLAR-TYPE, SHALLOW-CONTACT W UMA BINARY, DD INDUS

Observations and a 2015 Wilson-Devinney Program analysis are undertaken for the first precision observations of DD Indi. DD Indi is of solar-type (T-1 similar to 5750 K) and was determined to be a shallow-contact eclipsing binary. It was observed from 2013 June through September at Cerro Tololo InterAmerican Observatory in remote mode. The 24 inch Boller and Chivens reflector, now under management by The Southeastern Association for Resarch in Astronomomy (SARA) was used. Five new eclipse timings were obtained, for three primary and two secondary eclipses. Seven more eclipse timings were calculated from All Sky Automated Survey data. A possibly increasing period was found from all available eclipse timings with a 5 +/- 2 x 10(-11) x E-2 quadratic term. A BVRcIc simultaneous synthetic light-curve analysis reveals that the system has a mass ratio of similar to 0.46, a similar to 140 K component temperature difference, and two weak cool spots. The Roche Lobe fill-out of this W-type binary is only similar to 11%,. and an inclination of similar to 86 degrees was determined. A. time of constant light of similar to 16 minutes is measured around phase zero. More detail is included in this report.