Search Publications
A Filament-Associated Halo Coronal Mass Ejection
Zhang, Jun; Wang, Jingxiu; Nitta, Nariaki
There are only a few observations published so far that show the initiation of a coronal mass ejection (CME) and illustrate the magnetic changes in the surface origin of a CME. Any attempt to connect a CME with its local solar activities is meaningful. In this paper we present a clear instance of a halo CME initiation. A careful analysis of magnet…
Multi-frequency variations of the Wolf-Rayet system HD193793 (WC7pd+O4-5) III. IUE observations
Kaper, L.; Wamsteker, W.; Stickland, D. J. +4 more
The colliding-wind binary system WR 140 (HD 193793, WC7pd+O4-5, P = 7.94 yr) was monitored in the ultraviolet by IUE from 1979 to 1994 in 35 short-wavelength high-resolution spectra. An absorption-line radial-velocity solution is obtained from the photospheric lines of the O component, by comparison with a single O star. The resulting orbital para…
Evidence for Expanding Superbubbles in a Galaxy at z=0.7443
Vogt, Steven S.; Charlton, Jane C.; Churchill, Christopher W. +1 more
The intervening z=0.7443 Mg II absorption system in the spectrum of MC 1331+170 shows an unusual series of line pairs, each with Δv~30 km s-1. These lines could be explained as the shells of expanding superbubbles residing in the outer regions of an edge-on spiral galaxy visible in the optical image of the MC 1331+170 field. The color a…
Multicolor Observations of the Hubble Deep Field South
Fontana, Adriano; Grazian, Andrea; Bianchi, Simone +6 more
We present a deep multicolor (U, B, V, I, Js, H, Ks) catalog of galaxies in the Hubble Deep Field South, based on observations obtained with the HST WFPC2 in 1998 and VLT-ISAAC in 1999. The photometric procedures were tuned to derive a catalog optimized for the estimation of photometric redshifts. In particular we adopted a ``conservative'' detect…
Multicolor photometry of the Vela pulsar
Caraveo, P. A.; Mignani, R. P.
Multicolor photometry of the Vela pulsar (PSR B0833-45), updated by recent HST/WFPC2 observations obtained in the 555W, 675W and 814W filters, is presented. The available data provide the best characterization so far of the pulsar spectral shape, which is dominated by a flat power law continuum with spectral index alpha = -0.2 +/- 0.2, consistent …
Evolution of the dust mass loss with luminosity along the giant branch of the globular cluster 47 Tucanae
Jorissen, A.; Ramdani, A.
The present paper investigates the properties of the dust mass loss in stars populating the giant branch of the globular cluster 47 Tuc, by combining ISOCAM and DENIS data. Raster maps of 5 fields covering areas ranging from 4x4 to 15x15 arcmin2 at different distances from the center of the cluster have been obtained with ISOCAM at 11.5…
Compact Star Clusters in M81. I. Data from Hubble Space Telescope Wide Field Planetary Camera 2 Imaging
Chandar, Rupali; Ford, Holland C.; Tsvetanov, Zlatan
In this paper, we present the discovery of 114 compact star clusters in the nearby spiral galaxy M81 from B-, V-, and I-band Hubble Space Telescope Wide Field Planetary Camera 2 imaging in eight fields, covering a total area of ~40 arcmin2. The fields sample a variety of environments (both spiral and interarm regions), as well as a rang…
The galactic mass injection from cool stellar winds of the 1 to 2.5 Msun stars in the solar neighbourhood
Schröder, K. -P.; Sedlmayr, E.
We have computed synthetic stellar samples and HR diagrams on the basis of a fine-meshed, consistent grid of evolution tracks for given IMF and SFR(t). In order to model the galactic disk stellar component (single stars only) and to derive its IMF and apparent SFR(t), we selected the synthetic sample which is the best fit to the observed distribut…
A far infrared view of low mass star formation in the Cederblad 110 nebula of Chamaeleon I
Lemke, D.; Lehtinen, K.; Mattila, K. +1 more
The Cederblad 110 reflection nebula contains several young stellar objects previously discovered by IRAS and sub-mm observations. This cluster was revisited with ISO's FIR cameras and mapped with higher spatial resolution. All sources were also mapped for the first time near the maximum of their spectral energy distribution at 200 mu m. In additio…
The structure of the Akn 120 emitting region: The line shapes and long-term Hβ line profile variation
Bon, E.; Stanić, N.; Kubičela, A. +1 more
To investigate the structure of the Akn 120 emitting region we have analysed the spectral line profiles of Halpha, Hbeta, Lyalpha, C III[1909], C IV[1549] and Mg II[2798] lines using a Gaussian-decomposition approach. The decomposed shape of the Akn 120 lines indicates three separated broad line-emitting regions, i…