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Are solar granules the only source of acoustic oscillations?
Foglizzo, T.
The excitation mechanism of low degree acoustic modes is investigated through the analysis of the stochastic time variations of their energy. The correlation between the energies of two different modes is interpreted as the signature of the occurrence rate of their excitation source. The different correlations determined by Foglizzo etal (1998) co…
Epilogue: Cosmic Rays in the Active Heliosphere
Wibberenz, G.; Jokipii, J. R.
The lower main sequence of the globular cluster M3 with the Hubble Space Telescope: luminosity and mass functions
Montegriffo, P.; Paresce, F.; de Marchi, G. +6 more
We present HST observations of the lower main sequence of the Galactic globular cluster M3. Our data, obtained with WFPC2 in the F814W and F555W filters, sample a region centred about 4 arcmin away from the cluster centre (at ~4.2 core radii). The photometry of the WF2, WF3 and WF4 fields extends down to V~26.5 (I~25), much deeper than any previou…
Space Telescope Imaging Spectrograph Observations of the Interstellar Velocity Structure and Chemical Composition toward the Carina Nebula
Walborn, Nolan R.; Jenkins, Edward B.; Sembach, Kenneth R. +9 more
We have observed the O-type star CPD -59°2603 in the Carina Nebula with the Space Telescope Imaging Spectrograph near-UV and far-UV high-resolution echelles, at a resolving power of ~110,000 (FWHM) and S/N ~ 30. This sight line has complex velocity and excitation structure in the interstellar absorption lines, corresponding to three distinct regio…
Surface Brightness of Starbursts at Low and High Redshifts
Schneider, Donald P.; Weedman, Daniel W.; Wolovitz, Jeffrey B. +1 more
Observations in the rest-frame ultraviolet from various space missions are used to define the nearby starburst regions having the highest surface brightness on scales of several hundred parsecs. The bright limit is found to be 6 x 10^-16 ergs cm^-2 s^-1 Å^-1 arcsec^-2 for rest-frame wavelength of 1830 Å. Surface brightness in the brightest pixel i…
Ion acoustic-like waves observed by Ulysses near interplanetary shock waves in the three-dimensional heliosphere
Forsyth, R. J.; Neugebauer, M.; MacDowall, R. J. +2 more
The Ulysses spacecraft encountered 160 interplanetary shock waves between the time of its launch in October 1990 and the end of 1993 when it reached 48°S heliographic latitude. The onboard radio and plasma wave instrument observed many plasma waves associated with these shocks. Electrostatic waves at frequencies between the ion and electron plasma…
UV turn-off times of classical novae
Gallagher, J.; Orio, M.; Gonzalez-Riestra, R.
We present IUE spectra of classical novae obtained at least one year after the outburst. The UV luminosities are compared with the ROSAT\ observations and significant parameters of the systems. The turn-off times derived from the IUE data are in agreement with the ROSAT\ results, showing that most novae decline in bolometric luminosity 1-5 years a…
On the new lambda Bootis-type spectroscopic binary systems HD 84948 and HD 171948
Handler, G.; Garrido, R.; Heiter, U. +4 more
We report the discovery of two new lambda Bootis-type spectroscopic binary systems (HD 84948 and HD 171948). High resolution spectra were analyzed in order to derive abundances as well as astrophysical quantities. It resulted in extreme (HD 171948) and moderate (HD 84948) underabundances of Na, Mg, Si, Ca, Sc, Ti, Cr and Fe with respect to the Sun…
An extremely red r(1/4) galaxy in the test image of the Hubble Deep Field South
Ferguson, H. C.; Walker, A. R.; Treu, T. +14 more
We report the serendipitous discovery of an extremely red object in the Hubble Deep Field South (HDFS) Test NICMOS (Near Infrared Camera and Multi Object Spectrograph) field of view. The object is resolved in the NICMOS image and has a light profile very well described by an r(1/4) law with effective radius re=0farcs 20+/-0.05 and H_AB=…
Molecules of Non-Photospheric Origin in Red Giants and Supergiants Revealed by the ISO SWS
Ohnaka, K.; Yamamura, I.; Tsuji, T. +1 more
Overall SEDs based on ISO SWS observations show fair agreement with photospheric model predictions for red (super)giant stars. However, some details of molecular spectra cannot be explained by a photospheric origin. In particular, fine structure in the H2O 2.7 µm band can be clearly resolved by the SWS and is identified in an early M giant, whose …