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The HIPPARCOS Input Catalogue. I - Star selection
Arenou, F.; Crifo, F.; Gomez, A. +7 more
The Hipparcos Input Catalogue has been compiled, over the period 1982-1991, as the definitive observing catalog for the ESA's Hipparcos satellite, launched on 8 August 1989. It contains the most up-to-date, comprehensive, and homogeneous information on the 118,000 stars being observed by Hipparcos. Its stellar and data content is described in a se…
The NDAC HIPPARCOS data analysis consortium - Overview of the reduction methods
Snijders, M. A. J.; Evans, D. W.; Lindegren, L. +7 more
This paper gives an overview of the assumptions and algorithms adopted by the Northern Data Analysis Consortium (NDAC) for the reduction of data from the space astrometry satellite Hipparcos. A fairly detailed account is given of the main steps of the reduction, viz., the attitude determination, analysis of image dissector tube data, great-circle …
Nearly simultaneous observations of chromospheric and coronal radiative losses of cool stars.
Schrijver, C. J.; Dobson, A. K.; Radick, R. R.
The flux-flux relationships of cool stars are studied on the basis of nearly simultaneous measurements of Ca II H+K, Mg II h+k, and soft X-ray fluxes. A linear relationship is derived between IUE Mg II h+k fluxes and Mount Wilson Ca II H+K fluxes which were obtained within 36 hr of each other for a sample of 26 F5-K3 main-sequence stars. Nearly si…
PU Vulpeculae : the outburst of a symbiotic nova.
Vogel, M.; Nussbaumer, H.
We report the full history of PU Vulpeculae from outburst to 1991 as seen in its ultraviolet emission. We show that PU Vul is a symbiotic nova, which went into outburst in 1977 after a nova-like thermonuclear event. The outbursting object went first into an F supergiant phase. The spectrum evolved between 1979 and 1989 from F-type into that of Ao.…
In-orbit performance of the HIPPARCOS astrometry satellite
Grewing, M.; Lindegren, L.; Turon, C. +7 more
Launched in August 1989 into a geostationary transfer orbit, the Hipparcos astrometry satellite failed to reach its intended geostationary orbit through the failure of its apogee boost motor. Present indications are that the possible operational lifetime should nevertheless extend beyond the end of 1992, with extremely high-quality scientific data…
Faint object camera observations of M 87 : the jet and nucleus.
Boksenberg, A.; Barbieri, C.; Weigelt, G. +16 more
Ultraviolet and optical images of the central region and jet of the nearby elliptical galaxy M87 have been obtained with ~0.1 arcsec resolution in several spectral bands with the Faint Object Camera (FOC) on the Hubble Space Telescope, including polarisation images. Deconvolution enhances the contrast of the complex structure and filamentary patte…
Periodic outbursts in the peculiar X-ray binary 2S 0114+65.
Belloni, T.; Finley, J. P.; Cassinelli, J. P.
The peculiar X-ray binary system 2S 0114 + 65 has been observed by every X-ray satellite mission since its discovery by SAS 3 in 1977. A persistent feature of all the observations are outbursts on a time scale of about 3 hr. We have utilized the archival EXOSAT data, as well as published data and ROSAT all-sky survey data and show that the observe…
Absolute radius of an M giant.
Vogel, M.; Nussbaumer, H.; Monier, R.
We determine the absolute radius of an M2.4 III giant to be 75 solar radii, and we discuss and estimate the expected error. This value is found from the 1991 eclipse of the symbiotic binary EG And, observed in the UV. This system consists of a hot prewhite dwarf and an M giant. From two observed eclipses, separated by 6 orbital periods, we derive …
The FAST HIPPARCOS Data Reduction Consortium: Overview of the Adopted Reduction Software
Badiali, M.; Cardini, D.; Emanuele, A. +38 more
This paper gives the main features of the data analysis methods adopted by FAST in the calibration and processing of the Hipparcos data. The structure of the data reduction software is described and the actual processing and evaluation is presented.
Chromospheric heating in late-type dwarfs : acoustic or magnetic ?
Doyle, J. G.; Mathioudakis, M.
Mg II h and k fluxes for 69 K and 88 M dwarfs have been analyzed. An empirical lower limit is found in the Mg II flux, extended down to the latest spectral types. Based on the data presented here it is the magnetic component that dominates the emission from the atmosphere of cool dwarfs, especially the M dwarfs. It, however, coexists with an acous…