Context. The X-ray emission from B-type main-sequence stars is a longstanding mystery in stellar coronal research. Since there is no theory at hand that explains intrinsic X-ray emission from intermediate-mass main-sequence stars, the observations have often been interpreted in terms of (unknown) late-type magnetically active companion stars. Aims. Resolving the hypothesized companions requires...

We present preliminary results from a coronagraphic survey of young nearby Sun-like stars using the Palomar and Keck adaptive optics systems. We have targeted 251 solar analogs (F5–K5) at 20–160 pc from the Sun, spanning the 3–3000 Myr age range. The youngest (<500 Myr) ≈100 of these have been imaged with deeper exposures to search for sub-stellar companions. The deep survey is sensitive to bro...

The advance of mobile technologies leads to huge volumes of spatio-temporal data collected in the form of trajectory data stream. In this study, we investigate the problem of discovering object groups that travel together (i.e., traveling companions) from trajectory data streams. Such technique has broad applications in the areas of scientific study, transportation management and military surve...

The sharp and stable point spread function of HST and WFC3 allows for the detection of stellar companions at small offsets from target stars. Deep images obtained through six UVIS filters are used to assess this ability to detect faint companions of brighter targets. Analogous capabilities from the ground make use of Adaptive Optics and Speckle imaging. We contrast the capabilities of HST/WFC3 ...

A SNAP program (7420) proposed by David Golimowski (JHU) and Todd Henry (CfA) is underway to search for companions to nearby stars using NICMOS 2 (f/45, 0. ′′076/pix). Wellto over-exposed star images are obtained at the center of the detector in four filters: F110W, F180M, F207M, and F222M. The stars are typically saturated to allow for the detection of faint companions. The point spread functi...

Using the known detection limits for high-resolution imaging observations and the statistical properties of true binary and line-of-sight companions, we estimate the binary fraction of Kepler exoplanet host stars. Our speckle imaging programs at the WIYN 3.5m and Gemini North 8.1-m telescopes have observed over 600 Kepler objects of interest (KOIs) and detected 49 stellar companions within ∼1 a...

Non-player characters that act as companions for players are a common feature of modern games. Designing a companion that reacts appropriately to the player’s experience, however, is not a trivial task, and even current, triple-A titles tend to provide companions that are either static in behaviour or evince only superficial connection to player activity. To address this issue we develop an ada...

khunaji and his companions get influence from fakhr al-din razi and classified quantified propositions into two kinds: factual and external. abhari added the third kind which was named mental. tusi and his companions refuted khunaji’s viewpoint. analysis and explanation of the historical development of classification of predicative proposition into factual, external and mental is the problem of...