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Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G 231-40
Ferlet, R.; Lacour, S.; Vidal-Madjar, A. +3 more
We present new theoretical calculations of the total line profiles of Lyman alpha and Lyman beta which include perturbations by both neutral hydrogen and protons and all possible quasi-molecular states of H2 and H2+. They are used to improve theoretical modeling of synthetic spectra for cool DA white dwarfs. We com…
The spectroscopic binaries 21 Her and gamma Gem
Korotin, S. A.; Andrievsky, S. M.; Lehmann, H. +5 more
In the framework of a search campaign for short-term oscillations of early-type stars we analysed recently obtained spectroscopic and photometric observations of the early A-type spectroscopic binaries 21 Her and gamma Gem. From the radial velocities of 21 Her we derived an improved orbital period and a distinctly smaller eccentricity in compariso…
Infrared Space Observatory Polarimetric Imaging of the Egg Nebula (RAFGL 2688)
Kastner, Joel H.; Siebenmorgen, Ralf; Li, Jingqiang +1 more
We present polarimetric imaging of the protoplanetary nebula RAFGL 2688 obtained at 4.5 µm with the Infrared Space Observatory (ISO). We have deconvolved the images to remove the signature of the point spread function of the ISO telescope, to the extent possible. The deconvolved 4.5 µm image and polarimetric map reveal a bright point s…
The galaxy population of Cl1601+42 at
Fransson, Claes; Dahlén, Tomas; Näslund, Magnus
Photometric redshifts are used to determine the rest-frame luminosity function (LF) of both early- and late-type galaxies to for the cluster Cl1601+42 at . The total LF shows a steep faint-end slope , indicating the existence of a population of numerous dwarf galaxies. Luminous galaxies, with are mostly red, early-type galaxies, with a LF best des…
Matching the Observed Star Formation Intensity Distribution with Empirical Laws
Thompson, Rodger I.
This Letter matches the shape of the star formation intensity distribution function to empirical laws such as the Schmidt law. The shape of the distribution at a redshift of 1 is reproduced from the empirical Schmidt law with a critical density, a Schechter distribution of galaxy masses, and the assumption that star formation occurs mainly in expo…
The Source of a coronal mass ejection in a decayed solar active region
Gosain, Sanjay; Prasad Choudhary, Debi; Srivastava, Nandita
We have studied the source of a coronal mass ejection (CME), which occurred in a decayed active region NOAA 7978 on 19 October, 1996. The active region NOAA 7978 first appeared on the solar disk on 2 June, 1996 and made more than five disk passages before it decayed. The event analysed in this paper was observed during fifth disk passage. We have …
Determination of the Proper Motions and Membership of the Globular Cluster M3 and of its Orbit in the Galaxy
Chen, Li; Wang, Jia-Ji; Wu, Zhen-Yu
We examine 14 plates of the globular cluster M3 (NGC 5272) taken with the 40 cm refractor at the Sheshan station of Shanghai Astronomical Observatory. The plates span over a period of about 77 years. The positions and absolute proper motions of eight stars in the Hipparcos Catalogue and of 49 stars in the Tycho-2 Catalogue are used as the referenc…
Kinematic analysis of spiral structures in the local disk
Chiba, M.; Gouda, N.; Yano, T.
We present a method, based on the kinematic analysis of the Galactic disk stars near the Sun, to clarify whether the internal motions of the stellar system in spiral arms follow those expected in the density wave theory. The method is based on the linear relation between the phases of spatial positions and those of epicyclic motions of stars, as p…
Alfvénic turbulence in high-latitude solar wind: Radial versus latitudinal variations
Bavassano, B.; Pietropaolo, E.; Bruno, R.
Plasma and magnetic field measurements by Ulysses during its first out-of-ecliptic orbit have allowed extensive investigations on the behavior of Alfvénic turbulence in high-latitude solar wind from 1 to 5 AU. Most analyses have shown that the turbulence evolution in high-latitude wind is radial, rather than latitudinal, in nature. However, a rece…
Nice Observatory CCD measurements of visual double stars (4th series)
Gili, R.; Salaman, M.; Morlet, G.
We present 176 measurements of 167 visual double stars, made in 2000 and 2001 with the 50 cm refractor of the Nice Observatory and attached CCD camera, using an algorithm based on the adjustment of a tridimensional mathematical surface (Table 1). Position angle, angular separation and magnitude difference are given. 33 new binaries (HDS and TDS) d…