Search Publications
Submm/FIR CO line emission from the disk of the Class I protostar EL 29
Ceccarelli, C.; Caux, E.; Tielens, A. G. G. M. +3 more
We present observations towards the Class I protostar EL 29 of the CO J=6 -> 5 and J >= 15 transitions obtained with JCMT and ISO LWS respectively, and of five H_2 rotational lines obtained with ISO SWS. The simultaneous analysis of these observations reveals the presence of a warm gas component at about 170-250 K, ~ 550 AU in size, and whos…
Magellanic Clouds stellar clusters. II. New B,V CM diagrams for 6 LMC and 10 SMC clusters
Ripepi, V.; Castellani, V.; Brocato, E. +1 more
We present new CCD photometry for 6 LMC and 10 SMC stellar clusters taken at the ESO 1.54-m Danish Telescope in La Silla, to extend a previous investigation on Magellanic Clouds clusters based on HST snapshots. Thanks to the much larger area covered by the Danish detector, we investigate the spatial distribution of cluster stars, giving V, (B-V) C…
Detection of highly-ionized diffuse gas in the Galactic plane
Onaka, T.; Shibai, H.; Mizutani, M.
We obtained maps of the central 40arcmin x 20arcmin region of the
Temporal evolution of different temperature plasma during explosive events
Doyle, J. G.; Madjarska, M. S.
High cadence observations (10 s exposure time) obtained with the SUMER spectrometer on-board SoHO in the Ly 6 (20 000 K) and S VI (200 000 K) lines reveal new insight on the nature of explosive events. A time delay in the response of the S VI line with respect to the Ly 6 line has been observed, with the Ly 6 line responding with about 20-40 s ear…
The nature of the X-ray transient SAX J1711.6-3808
Santos-Lleo, M.; Ubertini, P.; Bazzano, A. +8 more
SAX J1711.6-3808 is an X-ray transient in the Galactic bulge that was active from January through May of 2001 and whose maximum 1-200 keV luminosity was measured to be 5x 10-9 erg cm-2 s-1 which is less than ~ 25% of the Eddington limit, if placed at a distance equal to that of the galactic center. We study the X-r…
STIS spectroscopy of newborn massive stars in SMC N81
Schaerer, D.; Martins, F.; Heydari-Malayeri, M. +2 more
Using Hubble Space Telescope observations with STIS, we study the main exciting stars of N81, a high excitation compact H II, region in the Small Magellanic Cloud (SMC). These far UV observations are the first spectroscopic measurements of stars in such a region and reveal features characteristic of an O6-O8 stellar type. The astonishing weakness …
The dynamics of an erupting prominence
Klein, K. -L.; Mouradian, Z.
Hα full disk observations and radio interferometry at decimetre and metre wavelengths are used to probe the dynamics of ejecta and electron acceleration during a solar eruptive event on 1990 September 14. An erupting prominence and a moving type IV radio source are shown to trace a common magnetic structure during its rise from ~ 10 Mm to 3 R…
A wavelet analysis of quasi-periodic variability across a solar coronal hole region
Bromage, B. J. I.; Marsh, M. S.; Walsh, R. W.
High time resolution (~13 s cadence) Solar and Heliospheric Observatory (SOHO) Coronal Diagnostic Spectrometer (CDS) Grazing Incidence Spectrometer (GIS) time series data is analysed for evidence of quasi-periodic variability in the solar corona. The observations are obtained from a GIS study of a coronal hole boundary region taken in October 1997…
Far-infrared spectroscopy across the asymmetric bipolar outflows from Cepheus A and L 1448
Smith, M. D.; Eislöffel, J.; Froebrich, D.
Bipolar outflows are driven from protostars within molecular cores. They drive into molecular clouds, generating shock waves whose molecular emission lines have been observed in the infrared with ISO. We present spectroscopic data for seven locations within two asymmetric outflows,
Near-infrared spectra of ISO selected Chamaeleon I young stellar objects
Gómez, M.; Persi, P.
We present 0.95-2.5 mu m moderate (R ~ 500) resolution spectra of 19 ISOCAM detected sources in the Chamaeleon I dark cloud. Thirteen of these stars are candidate very low mass members of the cloud proposed by Persi et al. (\cite{per00}) on basis of the mid-IR color excess. The sample also includes a bona-fide young brown dwarf (Cha Hα 1), a trans…