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The ROSAT all-sky survey catalogue of optically bright main-sequence stars and subgiant stars
Schmitt, J. H. M. M.; Voges, W.; Huensch, M.
We present X-ray data for all main-sequence and subgiant stars of spectral types A, F, G, and K and luminosity classes IV and V listed in the Bright Star Catalogue that have been detected as X-ray sources in the ROSAT all-sky survey; several stars without luminosity class are also included. The catalogue contains 980 entries yielding an average de…
Determination of the temperatures of selected ISO flux calibration stars using the Infrared Flux Method
Lynas-Gray, A. E.; Blackwell, D. E.
Effective temperatures for 420 stars with spectral types between A0 and K3, and luminosity classes between II and V, selected for a flux calibration of the Infrared Space Observatory, ISO, have been determined using the Infrared Flux Method (IRFM). The determinations are based on narrow and wide band photometric data obtained for this purpose, and…
On-line determination of stellar atmospheric parameters Teff, log g, [Fe/H] from ELODIE echelle spectra. II. The library of F5 to K7 stars
Soubiran, C.; Katz, D.; Cayrel, R.
A library of 211 echelle spectra taken with ELODIE at the Observatoire de Haute-Provence is presented. It provides a set of spectroscopic standards covering the full range of gravities and metallicities in the effective temperature interval [4000 K, 6300 K]. The spectra are straightened, wavelength calibrated, cleaned of cosmic ray hits, bad pixel…
On the use of the HIPPARCOS intermediate astrometric data
Evans, D. W.; van Leeuwen, F.
With the publication of the Hipparcos catalogue, astrometric data of unprecedented quality and quantity has become available, providing parallaxes, positions and proper motions free from systematic errors down to a level of at least 0.1 mas and 0.1 mas y(-1) . The Hipparcos catalogue, however, contains not only these ``ready-to-use'' positions, pa…
Mass determination of astrometric binaries with Hipparcos. III. New results for 28 systems
Mignard, F.; Martin, C.; McAlister, H. A. +1 more
This paper is the third of a series devoted to the determination of stellar masses from Hipparcos data. This is a continuation of Martin et al. (1997), who introduced the theory and assessed the performance of the method from simulated data, and of a second paper with the first results for 46 systems, ( te[Martin & Mignard 1998]{Mar98}). The o…
Long-term monitoring of active stars. VIII. UBV(RI)_(c) photometry collected in February 1992
Cutispoto, G.
As a part of an extensive program focusing on the global properties and evolution of active stars, high-precision UBV(RI)_c photometry of 31 selected stars, collected at the European Southern Observatory over the 14-29 February 1992 interval, is presented. Significant evolution of the light curves, period variations and evidence for long-term vari…
HIPPARCOS photometry of 24 variable massive stars (alpha Cygni variables)
van Leeuwen, F.; van Genderen, A. M.; Zegelaar, I.
The photometric variability of 24 alpha Cyg variables, i.e. variable super-and hypergiants, observed by the Hipparcos satellite is described. Three of the selected stars are situated in the SMC, 12 in the LMC and the remaining 9 in the Galactic plane. Four of them are hot S Dor-type variables, or LBVs (luminous blue variables) and two are possible…
New variable chemically peculiar stars identified in the HIPPARCOS archive
Paunzen, E.; Maitzen, H. M.
Since variability of chemically peculiar (CP) stars plays an important role for the astrophysical explanation of their outstanding behaviour, we have identified new variable CP stars listed in Renson's catalogue using the extensive Hipparcos Variability Annex. From the 293 objects found, 33 were excluded because they are no CP stars and/or have no…
On the HIPPARCOS photometry of chemically peculiar B, A, and F stars
Adelman, Saul J.
The Hipparcos photometry of the Chemically Peculiar main sequence B, A, and F stars is examined for variability. Some non-magnetic CP stars, Mercury-Manganese and metallic-line stars, which according to canonical wisdom should not be variable, may be variable and are identified for further study. Some potentially important magnetic CP stars are no…
Multiplicity among peculiar A stars. I. The AP stars HD 8441 and HD 137909, and the AM stars HD 43478 and HD 96391
Carrier, F.; Udry, S.; North, P. +2 more
We present the first results of a radial-velocity survey of cool Ap and Am stars. HD 8441 is not only a double system with P = 106.357 days, but is a triple one, the third companion having an orbital period larger than 5000 days. Improved orbital elements are given for the classical Ap star HD 137909 = beta CrB by combining our radial velocities w…