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24 papers · 1 filter
Spectropolarimetry of the Circinus Galaxy
E. Oliva, A. Marconi, A. Cimatti +1
High quality 4500-6800 A spectropolarimetric observations of the Circinus galaxy are reported. These show polarized and relatively broad (FWHM~3300 km/s) Halpha (as well as margina…
Evidence for Dust Related X-ray Emission from Comet C/1995 O1 (Hale-Bopp)
Alan Owens, A. N. Parmar, T. Oosterbroek +7
We report the discovery of X-ray emission from comet C/1995 O1 (Hale-Bopp) by the LECS instrument on-board BeppoSAX on 1996 September 10--11. The 0.1--2.0 keV luminosity decayed by…
Why is the X-ray luminosity function different for the Hyades and Praesepe?
D. Barrado y Navascues, J. R. Stauffer, S. Randich
We have studied dF-dK and dM stars belonging to Praesepe in order to determine membership via radial velocities and to compare several stellar properties, such as X-ray luminositie…
Near Infrared Spectra of the Orion Bar
A. Marconi, L. Testi, A. Natta +1
We have used the LONGSP spectrometer on the 1.5-m TIRGO telescope to obtain long slit spectra in the J, H, and K wavelength bands towards two positions along the Orion bar. These d…
Measurements of the 12C/13C ratio in Planetary Nebulae and implications for stellar evolution
F. Palla, D. Galli, R. Bachiller +1
We present the results of a study aimed at determining the 12C/13C ratio in two samples of planetary nebuale (PNe) by means of mm-wave observations of 12CO and 13CO. The first grou…
Neutral sodium from comet Hale-Bopp: a third type of tail
G. Cremonese, H. Boehnhardt, J. Crovisier +7
We report on the discovery and analysis of a striking neutral sodium gas tail associated with comet C/1995 O1 Hale-Bopp. Sodium D-line emission has been observed at heliocentric di…