Search Publications
Identification of RR Lyrae stars in the Tycho-2 catalogue
Mennessier, M. O.; Colomé, J.
The Tycho-2 catalogue provides astrometric and photometric data for the 2.5 million brightest stars in the sky. Therefore it can provide much larger samples than the Hipparcos samples used to date in statistical studies. The object of this paper is the cross-identification of Tycho-2 sources and known variable stars of RR Lyrae type. The Tycho-2 d…
The radial velocities and physical parameters of HD 553
Iliev, L.; Iliev, I. Kh.; Duemmler, R.
Erratum: Radiation-driven winds of hot luminous stars. XIII. A Description of NLTE line blocking and blanketing towards realistic models for expanding atmospheres
Pauldrach, A. W. A.; Hoffmann, T. L.; Lennon, M.
We present significant improvements of our approach in constructing detailed atmospheric models and synthetic spectra for hot luminous stars: 1. A sophisticated and consistent description of line blocking and blanketing. Our solution concept renders the line blocking influence on the ionizing fluxes (mainly the EUV and UV are affected) in identica…
CCD astrometry of faint compact extragalactic radio sources. III.
Costa, E.
Optical positions relative to the Hipparcos Catalogue (ESA 1997) have been obtained for the optical counterparts of 38 faint (B ~ 20-24) southern compact extragalactic radio sources (CERS). Many of these sources are not detectable - or their coordinates not adequately measurable - by means of direct photography with a wide-field telescope, so the …
The multiple frequencies of the delta Scuti star V350 Peg
García-Melendo, E.; Lampens, P.; Vidal-Sáinz, J. +1 more
V350 Peg is a delta Scuti star discovered by Hipparcos (ESA \cite{esa97}). During 35 nights between July 1997 and December 2001 some 7500 CCD V observations were acquired at the Monegrillo and Esteve Duran observatories in Spain. The new data show that this star pulsates in a close doublet of frequencies separated by 0.17 c/d (Delta f/f=3%) with s…
Optical positions of 55 radio stars from astrolabe observations from the Yunnan Observatory
Hui, H.; Rui, W.
The observations by the photoelectric astrolabe at Yunnan Observatory relative to the Hipparcos Catalogue and the optical positions of 55 radio stars were obtained from observations between 1991 and 2000. They all resulted from processing the photon counts obtained by means of the astrolabe after the automation of the instrument. There are 46 star…
IUE-newsips spectra of sigma Geminorum
Ekmekçi, F.; Karakuş, O.
The IUE spectra of sigma Gem have been taken from the NASA IUE archive using IDL (Interactive Data Language). The spectra have been observed in 1979-1986 period. All the spectra analysed in the present study have NEWSIPS reductions and consist of 25 LWP, 8 LWR and 5 SWP images in high resolution, and 2 LWP and 14 SWP images in low dispersion. The …