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The mass function of NGC 288
De Marchi, G.; Pasquali, A.; Brigas, M. S.
We present NICMOS NIC3 observations of the Galactic globular cluster NGC 288, taken South - East at 2.4 times the cluster's half-light radius in the J and H bands. We have detected the cluster main sequence down to J =~ 25 and H =~ 24. The corresponding luminosity function covers the range 3 < M_H < 9 and peaks at M_H =~ 6.8. The theoretical…
Erratum: Multi-component structure of solar and stellar transition regions
Peter, H.
The boron absorption line at 2089.6 Å in HD 140283?
Edvardsson, B.; Thorén, P.
We have observed the B i line at 2089.6 Å in the metal poor star HD 140283 with HST/STIS. The observation was an attempt to confirm the B abundances derived from the 2497 Å B i line in earlier works in general, and for for this star in particular (Edvardsson et al. 1994; Kiselman & Carlsson 1996). The resulting spectrum gained from 8 orbits of…
Fe+ column density and line opacities of the UV2 multiplet of Fe bt II in laboratory and peculiar stellar sources in laboratory and peculiar stellar sources
Rossi, C.; Baratta, G. B.; Viotti, R. F. +1 more
The Self-Absorption Curve method has been applied to the UV2 multiplet a6D-z6Fo of Fe ii observed in the laboratory and in emission-line stars. For the laboratory observations line opacities of this multiplet were obtained using various sets of atomic data. The best fit is obtained using data by Bergeson et al. (19…
Rotational modulation of the ultraviolet line fluxes from the RS CVn star II Pegasi
Sarro, L. M.; Byrne, P. B.
The exceptional in-orbit performance of the International Ultraviolet Explorer (IUE) for more than eighteen years has made it possible to accumulate an invaluable database of ultraviolet observations of a wide variety of objects and, in particular of active stars. \citeN{BS98} -hereafter Paper I- have presented a multiwavelength campaign of observ…
A spectroscopic study of the magnetic chemically peculiar star nu Fornacis
Leone, F.; Catanzaro, G.; Malaroda, S.
The magnetic chemically peculiar star
delta Scuti stars in stellar systems: On the variability of HD 220392 and HD 220391
Lampens, P.; Sinachopoulos, D.; Van Camp, M.
HD 220392 (HR 8895), the brightest member of the visual double star CCDM 23239-5349, is a new short-period variable bright star, probably of the delta Scuti type. The period analysis performed on the complete set of definitive Geneva photometry as well as on the data obtained at the ESO 0.5m telescope shows two periodicities of about 4.7 and 5.5 c…
Photometric orbital modulation in V 1080 Tauri
Gális, R.; Šimon, V.; Hanžl, D. +1 more
We present a photometric study of the variable star V 1080 Tauri. All photometric data, spanning in total about 9 years, can be folded with the period of 8.8451741 days, yielding a single-wave course with the full amplitude of 0.14 mag. The Hipparcos data show that the secular trend in the brightness variations is not larger than 0.04 mag and that…
Visual binary orbits and masses POST HIPPARCOS
Söderhjelm, Staffan
The parallaxes from Hipparcos are an important ingredient to derive more accurate masses for known orbital binaries, but in order to exploit the parallaxes fully, the orbital elements have to be known to similar precision. The present work gives improved orbital elements for some 205 systems by combining the Hipparcos astrometry with existing grou…
The HST view of FR I radio galaxies: evidence for non-thermal nuclear sources
Capetti, A.; Chiaberge, M.; Celotti, A.
Unresolved nuclear sources are detected by the Hubble Space Telescope in the great majority of a complete sample of 33 FR I radio galaxies belonging to the 3CR catalogue. The optical flux of these Central Compact Cores (CCC) shows a striking linear correlation with the radio core one over four decades, arguing for a non-thermal synchrotron origin …