Search Publications
Evolution of morphological features of CMEs deduced from catastrophe model of solar eruptions
Lin, J.; Soon, W.
We describe the evolution of morphological features of the magnetic configuration of CME according to the catastrophe model developed previously. For the parameters chosen for the present work, roughly half of the total mass is nominally contained in the initial flux rope, while the remaining plasma is brought by magnetic reconnection from the cor…
Searching for radiative pumping lines of OH masers: II. The 53.3 µm absorption line towards 1612 MHz OH maser sources
Chen, P. S.; He, J. H.
This is the second paper in a series aiming at searching for infrared pumping lines for galactic 1612 MHz OH masers. Our paper I is devoted to the 34.6 µm absorption lines in ISO SWS spectra towards a large sample of galactic OH/IR sources. This paper analyzes the 53.3 µm line in the ISO LWS spectra towards a similar sample of OH/IR so…
VISPO project: visible image-spectrometer for planetary observations
Piccioni, G.; Capaccioni, F.; De Petris, M. +3 more
Satellite instrumentations designed for planetary studies are often open to other interesting applications from ground: not only one can efficiently carry out detailed calibrations before space data become available, but also the prototypes of the satellite instruments can be successfully employed in different fields ranging from astrophysics to c…
Stellar populations and star cluster formation in interacting galaxies with the Advanced Camera for Surveys
de Grijs, Richard; Lee, Jessica T.; Clemencia Mora Herrera, M. +2 more
Pixel-by-pixel colour-magnitude and colour-colour diagrams—based on a subset of the Hubble Space Telescope Advanced Camera for Surveys Early Release Observations—provide a powerful technique to explore and deduce the star and star cluster formation histories of the Mice and the Tadpole interacting galaxies. In each interacting system we find some …
Faint stars in the Ursa Minor dwarf spheroidal galaxy: implications for the low-mass stellar initial mass function at high redshift
Wyse, Rosemary F. G.; Gilmore, Gerard; Gallagher, John S., III +4 more
The stellar initial mass function at high redshift is an important defining property of the first stellar systems to form and may also play a role in various dark matter problems. We here determine the faint stellar luminosity function in an apparently dark-matter-dominated external galaxy in which the stars formed at high redshift. The Ursa Minor…
XMM-Newton observations of the nearby brown dwarf LP 944-20
Bouy, Hervé; Martín, Eduardo L.
The nearby ( d=5.0 pc) brown dwarf LP 944-20 was observed with the XMM-Newton satellite on 07 January 2001. The target was detected with the Optical Monitor ( V=16.736±0.081), but it was not detected during the ≈48 ks observation with the X-ray telescopes. We determine a 3 σ upper limit for the X-ray emission from this object of LX<3…
Observations of Mira stars with the IOTA/FLUOR interferometer and comparison with Mira star models
Beckmann, U.; Weigelt, G.; Hofmann, K. -H. +16 more
We present K'-band observations of five Mira stars with the IOTA interferometer. The interferograms were obtained with the FLUOR fiber optics beam combiner, which provides high-accuracy visibility measurements in spite of time-variable atmospheric conditions. For the M-type Miras X Oph, R Aql, RU Her, R Ser, and the C-type Mira V CrB we derived th…
Diagnosis of coronal magnetic field with data of Nobeyama Radio Heliograph
Nakajima, Hiroshi; Huang, Guang-Li
The expression is derived for the coronal magnetic field strength from the observations of brightness, temperature, peak frequency, spectral index, and polarization degree of solar microwave bursts. One example of solar burst on November 28, 1998 is given for the calculation of coronal magnetic field from the data of Nobeyama Radio Heliograph (NoR…
The relation between far-UV and visible extinctions
Zagury, Frederic
For directions of sufficient reddening ( E( B- V)>∼0.25), there is a simple relation between the slope of the extinction curve in the far-UV and E( B- V). Regardless of direction, the far-UV extinction curve is proportional to 1/ λn e -2 E( B- V)/ λ ( λ in µm, n=4), in accordance with the idea that reddened stars spe…
ISOCAM observations of the deep IRAS 60 micron sample in the NEP region. II. Comparison of ISO and IRAS galaxy counts
Aussel, H.; Franceschini, A.; De Zotti, G. +3 more
We have determined IRAS flux densities at positions of sources detected by our ISOCAM LW3 observations of the IRAS deep survey sample in the north ecliptic polar region [ApJS 63 (1987) 311]. Exploiting the higher angular resolution of ISOCAM to deal with confusion effects and properly correcting the fluxes for observational biases, we show that 60…