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The SAURON project - VII. Integral-field absorption and emission-line kinematics of 24 spiral galaxy bulges
Bacon, Roland; Krajnović, Davor; Emsellem, Eric +10 more
We present observations of the stellar and gas kinematics for a representative sample of 24 Sa galaxies obtained with our custom-built integral-field spectrograph SAURON operating on the William Herschel Telescope. The data have been homogeneously reduced and analysed by means of a dedicated pipeline. All resulting data cubes were spatially binned…
The Gravity Field of the Saturnian System from Satellite Observations and Spacecraft Tracking Data
Jacobson, R. A.; Owen, W. M., Jr.; Mackenzie, R. A. +11 more
We present values for the masses of Saturn and its major satellites, the zonal harmonics in the spherical harmonic expansion of Saturn's gravitational potential, and the orientation of the pole of Saturn. We determined these values using an extensive data set: satellite astrometry from Earth-based observatories and the Hubble Space Telescope; Eart…
Keplerian discs around post-AGB stars: a common phenomenon?
Waters, L. B. F. M.; Dejonghe, H.; de Ruyter, S. +3 more
Aims.We aim at showing that the broad-band SED characteristics of our sample of post-AGB stars are best interpreted, assuming the circumstellar dust is stored in Keplerian rotating passive discs.Methods.We present a homogeneous and systematic study of the Spectral Energy Distributions (SEDs) of a sample of 51 post-AGB objects. The selection criter…
Evolutionary state of magnetic chemically peculiar stars
Kochukhov, O.; Bagnulo, S.
Context: .The photospheres of about 5-10% of the upper main sequence stars exhibit remarkable chemical anomalies. Many of these chemically peculiar (CP) stars have a global magnetic field, the origin of which is still a matter of debate.
Aims: .We present a comprehensive statistical investigation of the evolution of magnetic CP stars, aimed at…
Adaptive binning of X-ray data with weighted Voronoi tessellations
Statler, Thomas S.; Diehl, Steven
We present a technique to adaptively bin sparse data using weighted Voronoi tessellations (WVTs). WVT binning is a generalization of the Voronoi binning algorithm by Cappellari & Copin, developed for integral field spectroscopy. WVT binning is applicable to many types of data and creates unbiased binning structures with compact bins that do no…
Spectral analysis of the Galactic e+e- annihilation emission
Knödlseder, J.; Marcowith, A.; Guessoum, N. +5 more
We present a spectral analysis of the e+e- annihilation emission from the Galactic Centre region based on the first year of measurements made with the spectrometer SPI of the INTEGRAL mission. We have found that the annihilation spectrum can be modelled by the sum of a narrow and a broad 511 keV line plus an ortho-positronium…
Effective temperature scale and bolometric corrections from 2MASS photometry
Ribas, I.; Jordi, C.; Masana, E.
We present a method to determine effective temperatures, angular semi-diameters and bolometric corrections for population I and II FGK type stars based on V and 2MASS IR photometry. Accurate calibration is accomplished by using a sample of solar analogues, whose average temperature is assumed to be equal to the solar effective temperature of 5777 …
Nearby Debris Disk Systems with High Fractional Luminosity Reconsidered
Apai, D.; Derekas, A.; Ábrahám, P. +5 more
By searching the IRAS and ISO databases, we compiled a list of 60 debris disks that exhibit the highest fractional luminosity values (fd>10-4) in the vicinity of the Sun (d<120 pc). Eleven out of these 60 systems are new discoveries. Special care was taken to exclude bogus disks from the sample. We computed the fraction…
Fe II Emission in 14 Low-Redshift Quasars. I. Observations
Oyabu, Shinki; Tanabé, Toshihiko; Matsuoka, Yoshiki +3 more
We present the spectra of 14 quasars with a wide coverage of rest wavelengths from 1000 to 7300 Å. The redshift ranges from z=0.061 to 0.555 and the luminosity from MB=-22.69 to -26.32. These spectra of high quality result from combining Hubble Space Telescope spectra with those taken from ground-based telescopes. We describe the proced…
Stellar Populations in the Nuclei of Late-Type Spiral Galaxies
Ho, L. C.; Rix, H. -W.; Shields, J. C. +5 more
As part of an ongoing effort to study the stellar nuclei of very late type, bulge-less spirals, we present results from a high-resolution spectroscopic survey of nine such nuclear star clusters, undertaken with the VLT UVES. We fit the spectra with population synthesis models and measure Lick-type indices to determine mean luminosity-weighted ages…