Search Publications
A Kinematical Study for the Galaxy Based on the Revised Hipparcos Astrometric Data
Zhang, H.; Shen, M.
On the basis of the revised Hipparcos data recently released, the zero-point of the PL relation for classical cepheids was reexamined. Fitting proper motion and radial velocity data via an axis symmetric model, Oort constants and circular rotation velocity of the LSR were calculated to obtain Galactocentric distance of the sun, R0 = 8.0±0.8 kpc. F…
India analyses loss of lunar orbiter
Ramachandran, Ramaseshan
After a flawless launch last year, Chandrayaan-1, India's first lunar orbiter, has come to a disappointing end. In the early hours of 29 August, the tracking network of the Indian Space Research Organization (ISRO) lost its link with the satellite, just 312 days into a planned two-year mission. However, ISRO scientists have concluded that the 11 o…
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 …
The exploration of Titan and the Saturnian System by Cassini-Huygens
Coustenis, A.
Czech Participation in Integral
Hudec, R.; Blažek, M.; Kocka, M. +1 more
The INTEGRAL gamma-ray observatory, launched in October of 2002, is the first astrophysical mission of the European Space Agency with the Czech participation. Here we present and discuss the results of our investigations of cataclysmic variables, blazars, X-ray sources and GRBs obtained during the first six years of the mission.
Tidal Stripping of Globular Clusters
Coenda, V.; Muriel, H.; Donzelli, C.
We have analyzed 9 galaxies taken from the ACS Virgo Cluster Survey to study the tidal stripping of globular clusters in early type galaxies. We estimate the specific frequency (S_N) of globular clusters in the cluster galaxies, our results indicate that the mean S_N increases with the galactocentric distance. However, if the blue and red globular…
Prospects for Studies of Stellar Evolution and Stellar Death in the JWST Era
Barlow, Michael J.
I review the prospects for studies of the advanced evolutionary stages of low-, intermediate- and high-mass stars by the JWST and concurrent facilities, with particular emphasis on how they may help elucidate the dominant contributors to the interstellar dust component of galaxies. Observations extending from the mid-infrared to the submillimeter …
A new view on the ISM of galaxies: Far-infrared and submillimetre spectroscopy with Herschel
Wilson, Christine D.; Baes, Maarten; Madden, Suzanne C. +2 more
The FIR/submm window is amongst the least explored spectral regions of the electromagnetic spectrum. It is, however, a key to study the general properties of the interstellar medium of galaxies, as it contains important spectral line diagnostics from the neutral, ionized and molecular ISM. The Herschel Space Observatory, successfully launched on 1…
Solar Wind Effects Associated with a Recurrent, High-Latitude Coronal Brightness Enhancement
Parker, Gary D.
During the descent of Ulysses following the 2001 solar north pole passage, the SOHO LASCO C2 telescope recorded a particularly strong sequence of recurrent polarization brightness (pB) features at latitudes of around 55°. As Ulysses passed overhead, solar rotation swept the interplanetary extensions of these persistent coronal structures over the …
Spectral variations of carbon stars based on ISO SWS data
Chen, Pei-Sheng; Yang, Xiao-Hong
We investigate the spectral variations of seven carbon stars in the infrared using ISO SWS spectral data. Continuum variations of those carbon stars show that during the central star pulsations when carbon stars become fainter in the infrared, their ISO SWS spectra become redder and the near-IR temperature (Tnir) decreases. When carbon …