Search Publications
Calculation of the local standard of rest from 20 574 local stars in the New Hipparcos Reduction with known radial velocities
Francis, Charles; Anderson, Erik
ContextAn accurate estimate of the local standard of rest (LSR) is required to determine key parameters used in approximate galactic mass models and to understand Galactic structure and evolution. However, authors are often forced to base dynamical analyses on potentially unreliable figures because recent determinations of the LSR have failed to r…
On some properties of coronal mass ejections in solar cycle 23
Mittal, Nishant; Narain, Udit
We have investigated some properties such as speed, apparent width, acceleration, latitude, mass and kinetic energy, etc. of all types of coronal mass ejections (CMEs) observed during the period 1996-2007 by SOHO/LASCO covering the solar cycle 23. The results are in satisfactory agreement with previous investigations.
A W UMa type system from Southern Hemisphere: CN Hydri
Bakış, V.; Özkardeş, B.; Erdem, A.
We present an analysis of the Hipparcos photometry and the high-resolution ( {λ}/{Δλ}=41000) spectroscopy of the W UMa type system CN Hyi obtained in this study for the first time. The high resolution spectroscopic observations of the system were made at Mt. John University Observatory by using HERCULES fibre-fed échelle spectrograph in September …
The data mining: An analysis of 20 eclipsing binary light-curves observed by the INTEGRAL/OMC
Zasche, P.
Twenty eclipsing binaries were selected for an analysis from a huge database of observations made by the INTEGRAL/OMC camera. The photometric data were processed and analyzed, resulting in a first light-curve study of these neglected eclipsing binaries. Most of the selected systems are the detached ones. The system ET Vel was discovered to be an e…
Automated star-galaxy segregation using spectral and integrated band data for TAUVEX/ASTROSAT satellite data pipeline
Singh, Harinder P.; Gupta, Ranjan; Bora, Archana +1 more
We employ an Artificial Neural Network (ANN) based technique to develop a pipeline for automated segregation of stars from the galaxies to be observed by Tel-Aviv University Ultra-Violet Experiment (TAUVEX). We use synthetic spectra of stars from UVBLUE library and selected International Ultraviolet Explorer (IUE) low-resolution spectra for galaxi…
A serendipitous XMM-Newton observation of MACHO 104.20906.960: A dwarf nova candidate with a 2 h period
Guainazzi, M.; Nucita, A. A.; Carpano, S. +3 more
The binaries known as cataclysmic variables are particular binary systems in which the primary star (a white dwarf) accretes material from a secondary via Roche-lobe mechanism. Usually, these objects have orbital period of a few hours so that a detailed temporal analysis can be performed. Here, we present Chandra and XMM-Newton observations of a d…
Notices to investigation of symbiotic binaries IV. Optical light curves from the near-ultraviolet
Skopal, A.
The aim of this note is to reconstruct optical light curves (LC) from the near-UV fluxes of the ultraviolet spectra of symbiotic binaries during their quiescent phases. The method is based on the fact that the nebular component of radiation dominates the near-UV during quiescent phases and represents the main source of the light variability in the…
New variations of Mg II emission lines of Mira AB with HST
Sanad, M. R.; Ibrahim, Alhassan I.
This paper presents results from high resolution observations of the Mira AB binary system taken by the HST (Hubble Space Telescope) in the ultraviolet region through the period (1999-2004). By comparing the results using HST data with those obtained from the IUE (International Ultraviolet Explorer) observations through the period (1979-1995). we …