Search results for "Contact binary"

Four colour photometry of late-type binary systems

1997

This paper presents rst complete uvby light curves of the late-type detached eclipsing binary ZZ UMa (G0V + G8V, P =2 : d 2993). This binary system has been observed during eight campaigns at the Calar Alto Observatory (Almeria, Spain)and at the Sierra Nevada Observatory (Granada, Spain). 294 points distributed over the binary period and covering both eclipses are given. The comparison stars used to calculate the dierential light curves (SAO 15242 and SAO 15251) were conrmed as being good reference stars with constant flux. These observations are part of a 6 year uvby and H monitor- ing program of low mass eclipsing binaries whose main objective is to provide accurate absolute astrophysical…

THE BINARY NATURE OF CH-LIKE STARS

2016

Four colour photometry of binary systems

1998

This paper presents new uvby light curves of the detached eclipsing binary CR Cas together with some H measurements. From the analysis of the photometry we have estimated preliminary values for interstellar red- dening and distance, radiative parameters of both compo- nents and an approximation to the geometrical elements of the system. The intrinsic photometric indices are com- patible with spectral types B0.5V + B1V.

Four colour photometry of late-type binary systems

1997

This paper presents new complete uvby light curves of the late-type detached eclipsing binary BH Vir (G0V + G5V, P =0 : 81687099). This binary system has been observed during four cam- paigns at the Calar Alto Observatory (Almeria, Spain) and at the European Southern Observatory (La Silla, Chile). This observations are part of a 6 yearuvby and H monitoring program of low mass eclipsing binaries which main objective is to provide accurate absolute astrophys- ical parameters for late-type main sequence stars. 1585 points spreaded over the binary period and covering both eclipses are given. The internal accuracy of the standard photometry measured as the mean RMS of the dierences between stand…

Dynamical environments of MU69: a state of chaotic clearing

2018

AbstractThe second (after Pluto) plausible target object for the New Horizons mission is 2014 MU69. It is a classical TNO, a primordial contact binary. Identifying any material in the vicinities of a target object is of an especial concern for planning cosmic fly-byes, as it is hazardous for a space probe. Luckily, no such material has been reported for MU69 up to now. The point of our report is that this lucky absence is just a dynamical consequence of the physical nature of MU69. Spinning gravitating dumbbells create zones of dynamical chaos around them, and this has a clearing effect: any material put in orbits around a rotating dumbbell (e.g., any material ejected from its surface) cann…