We present new nearby stars extracted from a proper motion catalogue and having a DENIS counterpart. Their distances and spectral type are estimated using the DENIS colours. 107 stars are within 50 pc. 31 stars among them have previously measured distances. In addition, 40 stars may enter within the 50 pc limit depending on which population they belong to. 6 stars among them have already measur...

The first phase of the Caltech Wide Area Sky Survey occurred from late November 2001 through mid-April 2003. We present preliminary results from this survey which has detected 28 bright Kuiper Belt Objects (KBOs) and 4 Centaurs, 19 of which were discovered in our survey including Quaoar, the largest KBO, as well as 6 of the 10 intrinsically brightest KBOs. We have surveyed 5108 square degrees o...

An analysis of low resolution spectra and infrared data of 29 ISOGAL-DENIS sources with mid-IR excess is presented. Eight ISOGAL sources from our sample with 7–15 µm excesses are found to be B and A-type stars, some of them with emission lines. Two ISOGAL sources, J175614.4-240831 (B3-4IIIe) and J173845.3-312403 (B7IIIe), show a bump between 5000 and 6000Å which may be attributed to extended re...

Context. The detection of radio pulses from cosmic ray air showers is a potentially powerful new detection mechanism for studying spectrum and composition of ultra high energy cosmic rays that needs to be understood in greater detail. The radiation consists in large part of geosynchrotron radiation. The intensity of this radiation depends, among other factors, on the energy of the primary parti...

We describe the flattening of scientific CCD imaging data using a dome flat field system. The system uses light emitting diodes (LEDs) to illuminate a carefully constructed dome flat field screen. LEDs have several advantages over more traditional illumination sources: they are available in a wide range of output wavelengths, are inexpensive, have a very long source lifetime, and are straightfo...

Lacey Knowles studied grasshoppers in the genus Melanopus. She collected 1275bp of DNA sequence data from cytochrome oxidase I (COI) from 124 individuals of M. oregonensis and two outgroup speices. The specimens were collected from 15 “sky-island” sites in the northern Rocky Mountains (see Figure 1; [5]). Two alternative hypotheses had been proposed to describe the evolutionary relationships am...

The Compton Gamma-Ray Observatory (CGRO) experiments EGRET and COMPTEL observed the Virgo sky region continuously for 7 weeks between December 10, 1996 and January 28, 1997. The prominent quasar 3C 273 was found to be the brightest source in γ-rays and was significantly detected by EGRET and COMPTEL. The EGRET experiment observed a time-variable flux at energies above 100 MeV, which reached in ...

Roughly 25% of the optical extragalactic sky is obscured by the dust and stars of our Milky Way. Dynamically important structures might still lie hidden in this zone. Various surveys are presently being employed to uncover the galaxy distribution in the Zone of Avoidance (ZOA) but all suffer from (different) limitations and selection effects. We illustrate the promise of using a multi-wavelengt...

ISTVAÂ N BORZSAÂ K*, PETER T. CUMMINGS, and DENIS J. EVANS 1 Institute of Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, P.O. Box 17, Budapest, H-1525, Hungary Departments of Chemical Engineering, Chemistry and Computer Science, University of Tennessee, Knoxville, TN 37996-1508 , USA and Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-61...