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Thick disk and old disk carbon-rich giants in the Sun vicinity
Bergeat, J.; Knapik, A.; Rutily, B.
Making use of the HIPPARCOS data and refining a previous study of the space distribution of the carbon-rich giant stars located in the vicinity of the Sun (Paper I), we fully investigate their space distributions and space velocities on the basis of our photometric grouping (CVi i.e. carbon variable stars with i=1 to 7; HCj i.e. hot carbon stars w…
The ISO Galactic metallicity gradient revisited
Morisset, C.; Sternberg, A.; Giveon, U.
Two independent groups (Giveon et al. \cite{giveon}; Martín-Hernández et al. \cite{martin}) have recently investigated the Galactic metallicty gradient as probed by ISO observations of mid-infrared emission-lines from HII regions. We show that the different gradients inferred by the two groups are due to differing source selection and differing ex…
Variability and dynamic state of active region loops
Gurman, J. B.; Wilhelm, K.; Fredvik, T. +3 more
A set of 218 consecutive CDS rasters taken at the solar limb on October 26-28 1999 has been used to investigate the variability and plasma dynamics of active region loops. Each raster contains simultaneous images in 6 different lines, covering the full temperature range of CDS, 10 000 K (He I) to 2.7 MK (Fe XVI). Activity is seen to go on without …
HST Observations of Sakurai's Object (V4334 Sgr) and Related Stars
Bond, Howard E.; Pollacco, Don L.
We describe our ongoing program of HST observations of Sakurai's Object(V4334 Sgr). Direct WFPC2 imaging from August 1996 through August 2000 revealsno transient features (such as light echoes), and documents the decline of thestar to below 24th visual magnitude in 2000. The surrounding planetary nebulahas shown no changes from 1996 through 2000. …
The orientation of the Seyfert nucleus in Markarian 348
Browne, I. W. A.; Thean, A. H. C.; Pedlar, A. +1 more
Multi-frequency observations of Mrk 348 are presented consisting of two epochs of MERLIN data at 5 GHz, ISOPHOT data at 170, 90, 60 and 25 µm, Nordic Optical Telescope images in the U, B, R and I bands and data at 1350 µm from the archive for SCUBA. The new optical images reveal a disrupted arm that ends towards the eastern companion o…
Metallicity Determinations from Ultraviolet-Visual Spectrophotometry. I. The Test Sample
Chavez, M.; Di Marcantonio, P.; Morossi, C. +2 more
New visual spectrophotometric observations of non-supergiant solar neighborhood stars are combined with IUE Newly Extracted Spectra (INES) energy distributions in order to derive their overall metallicities, [M/H]. This fundamental parameter, together with effective temperature and apparent angular diameter, is obtained by applying the flux-fittin…
Overview of mirror mode fluctuations in the jovian dusk magnetosheath: Cassini magnetometer observations
André, N.; Erdös, G.; Dougherty, M.
The recent Cassini flyby of Jupiter provides a new unique data set in order to allow tracking of the instability along flow lines down to the distant magnetosheath, as yet unexplored by previous missions. Signatures consistent with mirror mode activity were frequently observed during the flyby in the magnetometer data, appearing at many different …
Slow and fast solar wind acceleration near solar maximum
Breen, A. R.; Moran, P. J.; Tappin, S. J. +4 more
2-site measurements of interplanetary scintillation (IPS) provide measurements of solar wind speed in regions of the heliosphere which are otherwise inaccessible. We present results from co-ordinated observations made with the EISCAT and MERLIN facilities during 1999 and 2000, covering heliocentric distances from 7 to 80 solar radii (R) predominan…
First XMM-Newton observations of the globular cluster M 22
Webb, N. A.; Barret, D.; Gendre, B.
We have examined preliminary data of the globular cluster, M 22, from the EPIC MOS detectors on board XMM-Newton. We have detected 27 X-ray sources within the centre of the field of view, 24 of which are new detections. Three sources were found within the core of the cluster. From spectral analysis of the X-ray sources, it is possible that the obj…
Jet-triggered Type Ia Supernovae in Radio Galaxies?
Capetti, Alessandro
We report the serendipitous discovery of a supernova (SN) in the nearby radio galaxy 3C 78. Observations obtained with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope show, at a distance of 0.54" (300 pc) from the galaxy nucleus, a second bright source, not present in previous images. As this source was fortuitously co…