We present results of the CFHT adaptive optics (AO) search for companions of a homogeneous group of contact binary stars, as a contribution of our attempts to prove a hypothesis that these binaries require a third star to become so close as observed. The data were obtained on two nights in 1998 and two nights in 2005. In addition to companions directly discovered at separations of 1 − 10 separa...

Self-gravitating protostellar discs are unstable to fragmentation if the gas can cool on a time scale that is short compared to the orbital period. We use a combination of hydrodynamic simulations and N-body orbit integrations to study the long term evolution of a fragmenting disc with an initial mass ratio to the star of M disc /M * = 0.1. For a disc which is initially unstable across a range ...

This study was done to explore the views of patients and their companions concerning endotracheal intubation training on newly deceased patients and the necessity of obtaining their consent in this regard. In this cross-sectional descriptive analytical study, we used a questionnaire to collect data through structured interviews conducted by the researcher on patient discharge day. A convenient ...

Anticipating new spectroscopic studies of quasar companions, we calculate expected emission line spectra for the companion galaxies. Under the assumption of isotropic photoionizing radiation, we predict equivalent widths for Hα, Hβ, [O iii] λ5007, [O ii] λ3727, [Ne iii] λ3869, and Mg ii λ2798 lines. We consider 6 quasars, two of which (PKS 213514 and PKS 2349-014) have very close companions wit...

Cool Land T-type objects were discovered first as companions to stars in 1988 and 1995, respectively. A certain example of the yet cooler Y-type spectral class (Te f f.500 K?) has not been seen. Recent infrared imaging observations of stars and brown dwarfs indicate that substellar companions with large semi-major axes and with masses less than the brown dwarf/giant planet dividing line (∼13.5 ...

Context. Since 1999, we have been conducting a radial velocity survey of 179 K giants using the Coudé Auxiliary Telescope at UCO/Lick observatory. At present ∼20−100 measurements have been collected per star with a precision of 5 to 8 m s−1. Of the stars monitored, 145 (80%) show radial velocity (RV) variations at a level >20 m s−1, of which 43 exhibit significant periodicities. Aims. Our aim i...

Recent research has revealed beneficial post-partum, psychosocial effects on the mother following labour which was accompanied by supportive companions. Whether these effects are obtained as a result of having companionship during labour or because of specific personality characteristics of the companions provided is important and is explored in this paper. Although findings revealed few differ...

Aims. We search for low-mass companions in the innermost region (<300 mas, i.e., 6 AU) of the β Pic planetary system. Methods. We obtained interferometric closure phase measurements in the K-band with the VLTI/AMBER instrument used in its medium spectral resolution mode. Fringe stabilization was provided by the FINITO fringe tracker. Results. In a search region of between 2 and 60 mas in radius...

We present the results of a study of the late-type companions in hot subdwarf composite spectrum binaries. The exact nature of these late-type companions has been disputed in the literature — some argue that they are main sequence stars, and others have claimed they are subgiants. To determine the properties of the late-type companions, we first conducted a survey utilizing the Two Micron All S...

The mass distribution of substellar companions exhibits a steep rise for masses below 5 MJ. Thus, the 14 companions having Msin i = 0.5 { 5 MJ are considered the best candidate planets around main sequence stars. The occurrence of such planets within 3 AU is 4%, but 2/3 of them orbit within just 0.3 AU. This \pile up" of planets near stars suggests that inward orbital migration occurred after f...