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The ROSAT all-sky survey catalogue of the nearby stars
Schmitt, J. H. M. M.; Sterzik, M. F.; Voges, W. +1 more
We present X-ray data for all entries of the Third Catalogue of Nearby Stars \cite[(Gliese & Jahreiss 1991)]{gli91} that have been detected as X-ray sources in the ROSAT all-sky survey. The catalogue contains 1252 entries yielding an average detection rate of 32.9 percent. In addition to count rates, source detection parameters, hardness ratio…
Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Halbwachs, J. -L.; Arenou, F.; Rolland, L. +11 more
Radial velocities have been determined for a sample of 2930 B2-F5 stars, 95% observed by the Hipparcos satellite in the north hemisphere and 80% without reliable radial velocity up to now. Observations were obtained at the Observatoire de Haute Provence with a dispersion of 80 Ä,mm(-1) with the aim of studying stellar and galactic dynamics. Radial…
Galactic globular cluster stars: From theory to observation
Salaris, M.; Weiss, A.; Cassisi, S. +2 more
We use evolutionary calculations presented in a recent paper \cite[(Cassisi et al. 1997a:]{C97a} hereinafter Paper I) to predict B, V, I magnitudes for stars in galactic globulars. The effect of the adopted mixing length on stellar magnitudes and colors is discussed, showing that the uncertainty on such a theoretical parameter prevents the use of …
The distribution of nearby stars in phase space mapped by Hipparcos. Clustering and streaming among A-F type stars
Bienaymé, O.; Crézé, M.; Chereul, E.
This paper presents the detailed results obtained in the search of density-velocity inhomogeneities in a volume limited and absolute magnitude limited sample of A-F type dwarfs within 125 parsecs of the Sun. A 3-D wavelet analysis is used to extract inhomogeneities, both in the density and velocity distributions. Thus, a real picture of the phase …
Millimeter and some near infra-red observations of short-period Miras and other AGB stars
Blommaert, J. A. D. L.; Groenewegen, M. A. T.; Baas, F. +3 more
Millimeter observations of 48 oxygen- and 20 carbon-rich AGB Miras with periods shorter than 400 days are presented. In addition, observations of 14 O-rich and 15 C-stars with longer, or no known, periods have also been obtained. The detection statistics is as follows: in 12CO J=1-0 and 2-1 we observed 97 stars, and detected 66 in at le…
Radial velocities of HIPPARCOS southern B8-F2 type stars
Gerbaldi, M.; Faraggiana, R.; Grenier, S. +5 more
Radial velocities have been determined for a sample of B8-F2 type stars observed by the Hipparcos satellite. Observations were obtained within the framework of an ESO key-program. Radial velocities have been measured using a cross-correlation method, the templates being a grid of synthetic spectra. The obtained precision depends on effective tempe…
Classification of EUV stellar sources detected by the ROSAT WFC. I. Photometric and radial velocity studies
Tagliaferri, G.; Pallavicini, R.; Messina, S. +2 more
We present the results of high-precision UBV(RI)_c photometric observations and of spectroscopic radial velocity measurements obtained at the European Southern Observatory for a sample of 51 cool stars detected in the EUV by the ROSAT Wide Field Camera (WFC). Using also recent results from HIPPARCOS, we infer spectral types and investigate the sin…
IC 348 proper motion study from digitised Schmidt plates
Preibisch, T.; Zinnecker, H.; Meusinger, H. +6 more
A new proper motion study for about 1400 stars with R < 18 mag in a one square degree region around the young open cluster IC 348 based on Schmidt plates is presented. With an overall accuracy of about 3 mas/yr (2.5 mas/yr, respectively for all stars with R < 17 mag) we have obtained membership probabilities dividing our sample into three gr…
The Bordeaux and Valinhos CCD meridian circles
Teixeira, R.; Colin, J.; Mazurier, J. M. +14 more
A first CCD 512x 512 camera working in scan mode (declination field 14') was mounted in 1994 on the Bordeaux CCD meridian circle. After a testing period, this camera was installed on the Valinhos CCD meridian circle (near S\ ao Paulo, Brazil), as part of a collaboration between Bordeaux Observatory and the Instituto Astronomico e Geofisico of S\ a…
A search for rapid oscillations in chemically peculiar A-type stars
Handler, G.; Paunzen, E.
In 1995 we initiated a Northern Hemisphere survey for rapidly oscillating Ap stars. This paper presents the results including one new roAp star (HD 122970), the confirmation of rapid oscillations of HD 99563 and apparent null results for other stars. Using Hipparcos data a statistical analysis of the absolute magnitudes and galactic distributions …