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Laboratory investigation on the formation of unsaturated nitriles in Titan's atmosphere
Kaiser, R. I.; Balucani, N.; Asvany, O. +3 more
Crossed molecular beam experiments of ground state cyano radicals, CN(X 2Σ +), with hydrocarbons acetylene (C 2H 2), ethylene (C 2H 4), methylacetylene (CH 3CCH), allene (H 2CCCH 2), dimethylacetylene (CH 3CCCH 3), and benzene (…
Local Luminosity Function at 15 Microns and Galaxy Evolution Seen by ISOCAM 15 Micron Surveys
Xu, Cong
A local luminosity function at 15 µm is derived using the bivariate (15 µm vs. 60 µm luminosity) method, based on the newly published ISOCAM LW3 band (15 µm) survey of the very deep IRAS 60 µm sample in the north ecliptic pole region (NEPR). New IRAS 60 µm fluxes are obtained using the SCANPI/SUPERSCANPI softwar…
A moving group of young stars in Carina-Vela
Makarov, Valeri V.; Urban, Sean
Accurate two-colour photometry and proper motions of 7096 young X-ray stars in the ROSAT All-Sky Survey Bright Star Catalogue, version 1RXS, are extracted from the Tycho-2 Catalogue. The sample is dominated by red main-sequence and possibly pre-main-sequence stars. On a global proper motion convergence map, two features are very prominent: the nea…
A numerical study of the evolution of the solar wind from Ulysses to Voyager 2
Wang, C.; Richardson, J. D.; Gosling, J. T.
Voyager 2 continues to explore the outer heliosphere as Ulysses studies the latitudinal dependence of the solar wind. During the year 1991 these spacecraft were within 2° latitude and their radial separation was larger than 30 AU. This alignment presents a good opportunity to investigate the evolution of the solar wind and, in particular, the effe…
ROSAT HRI catalogue of X-ray sources in the LMC region
Pietsch, W.; Haberl, F.; Sasaki, M.
All 543 pointed observations of the ROSAT High Resolution Imager (HRI) with exposure times higher than 50 s and performed between 1990 and 1998 in a field of 10°\ x 10°\ covering the Large Magellanic Cloud (LMC) were analyzed. A catalogue was produced containing 397 X-ray sources with their properties measured by the HRI. The list was cross-correl…
The Evolving Morphology of the Bipolar Nebula M2-9
Corradi, R. L. M.; Balick, Bruce; Schwarz, H. E. +1 more
The planetary nebula M2-9 has drastically changed its shape since its discovery by Minkwoski. Although the outline of the nebula seems to be stationary, most of the knots and bright features (N1, N2, S1, and S2) have moved laterally from the west to the east edges of both lobes. These features and their changes have reflection, not point, symmetry…
Hydrogen Lyα Absorption Predictions by Boltzmann Models of the Heliosphere
Zank, Gary P.; Wood, Brian E.; Müller, Hans-Reinhard
We use self-consistent kinetic/hydrodynamic models of the heliosphere to predict H I Lyα absorption profiles for various lines of sight through the heliosphere. These results are compared with Lyα absorption lines of six nearby stars observed by the Hubble Space Telescope. The directions of these lines of sight range from nearly upwind (36 Oph) to…
The Mass Function of Main-Sequence Stars in NGC 6397 from Near-Infrared and Optical High-Resolution Hubble Space Telescope Observations
Paresce, Francesco; De Marchi, Guido; Pulone, Luigi
We have investigated the properties of the stellar mass function in the globular cluster NGC 6397 through the use of a large set of Hubble Space Telescope (HST) observations. The latter include existing WFPC 2 images in the V and I bands, obtained at ~4.5‧ and 10' radial distances, as well as a series of deep images in the J and H bands obtained w…
On the possibility of ground-based direct imaging detection of extra-solar planets: the case of TWA-7
Neuhäuser, R.; Huélamo, N.; Brandner, W. +5 more
We show that ground-based direct imaging detection of extra-solar planets is possible with current technology. As an example, we present evidence for a possible planetary companion to the young T Tauri star 1RXSJ104230.3-334014 (=TWA-7), discovered by ROSAT as a member of the nearby TW Hya association. In an HST NICMOS F160W image, an object is de…
A Distance-Independent Age for the Globular Cluster M92
Grundahl, F.; Stetson, P. B.; Andersen, M. I. +2 more
We use deep Strömgren CCD photometry to determine the age of the globular cluster M92 (NGC 6341) from the [(v-y)0,c0]-diagram. Besides being completely independent of distance, this color-color plot has the further advantage that it is not very sensitive to the amount of foreground interstellar absorption. The main disadvanta…