Search Publications
Rotational periods and evolutionary models for subgiant stars observed by CoRoT⋆
do Nascimento, J. -D.; Castro, M.; da Costa, J. S.
Context. We present rotation period measurements for subgiants observed by CoRoT. Interpreting the modulation of stellar light that is caused by star-spots on the time scale of the rotational period depends on knowing the fundamental stellar parameters.
Aims: Constraints on the angular momentum distribution can be extracted from the true stel…
3-dimensional kinematics in low foreground extinction windows of the Galactic bulge. Radial velocities for six bulge fields: procedures and results
Rich, R. M.; Soto, M.; Kuijken, K.
Aims: The detailed structure of the Galactic bulge still remains uncertain. The strong difficulties of obtaining observations of stars in the Galactic bulge have hindered the acquisition of a kinematic representation for the inner kpc of the Milky Way. The observation of the 3-d kinematics in several low foreground extinction windows can solv…
The X-ray luminous galaxies optically classified as star forming are mostly narrow line Seyfert 1 s
Ballo, L.; Barcons, X.; Carrera, F. J. +3 more
Context. The optical and ultraviolet emission lines of galaxies are widely used to distinguish star-forming (SF) galaxies from active galactic nuclei (AGNs). However, this type of diagnostic has some associated uncertainties, because AGNs can be of low luminosity and/or heavily obscured, and the optical emission lines may be dominated by a stellar…
XMMU J0541.8-6659, a new supernova remnant in the Large Magellanic Cloud
Pietsch, W.; Haberl, F.; Smith, R. C. +6 more
Context. The high sensitivity of the XMM-Newton instrumentation offers the opportunity to study faint and extended sources in the Milky Way and nearby galaxies such as the Large Magellanic Cloud (LMC) in detail. The ROSAT PSPC survey of the LMC has revealed more than 700 X-ray sources, among which there are 46 supernova remnants (SNRs) and candida…
Radiation-driven winds of hot luminous stars. XVII. Parameters of selected central stars of PN from consistent optical and UV spectral analysis and the universality of the mass-luminosity relation
Pauldrach, A. W. A.; Kaschinski, C. B.; Hoffmann, T. L.
Context. The commonly accepted mass-luminosity relation of central stars of planetary nebulae (CSPNs) might not be universally valid. While the atmospheric parameters Teff, log g, and the He abundances have in the past been determined using fits to photospheric H and He absorption lines from plane-parallel model atmospheres, the masses …
A population of isolated hard X-ray sources near the supernova remnant Kes 69
Chen, Y.; Miceli, M.; Bocchino, F. +6 more
Recent X-ray observations of the supernova remnant (SNR) IC 443 interacting with molecular clouds detected a new population of hard X-ray sources related to the remnant itself, which has been proposed to be fast ejecta fragments propagating within the dense environment. Encouraged by these studies, we obtained a deep XMM-Newton observation of the …
A hybrid approach to cosmic microwave background lensing reconstruction from all-sky intensity maps
Perotto, L.; Plaszczynski, S.; Starck, J. -L. +1 more
On the basis of realistic simulations, we propose a hybrid method to reconstruct the lensing potential power spectrum, directly on Planck-like cosmic microwave background frequency maps. This involves the use of a large Galactic mask and the treatment of strong inhomogeneous noise. For ℓ ≲ 100, we show that a full-sky inpainting method, which was …
The X-ray variability history of Markarian 3
Guainazzi, M.; Miniutti, G.; La Parola, V. +2 more
Context. The unified scenario for active galactic nuclei (AGN) postulates that our orientation with respect to a parsec-scale azimuthally-symmetric gas and dust system causes the difference in their phenomenology in the optical/UV and X-ray bands. Only recently have high-resolution radio (VLBI) and IR interferometric observations provided direct c…
Distance and reddening of the Local Group dwarf irregular galaxy NGC 6822
Bono, G.; Pietrinferni, A.; Monelli, M. +3 more
On the basis of a new photometric analysis of the Local Group dwarf irregular galaxy NCG 6822 based on observations obtained with the Advanced Camera for Surveys onboard the Hubble Space Telescope, we have obtained a new estimate of the extinction of two fields located in the southeast region of the galaxy. Because of significant differences in th…
Globular cluster systems in fossil groups: NGC 6482, NGC 1132, and ESO 306-017
Côté, P.; Blakeslee, J. P.; Jordán, A. +6 more
We study the globular cluster (GC) systems in three representative fossil group galaxies: the nearest (NGC 6482), the prototype (NGC 1132) and the most massive known to date (ESO 306-017). This is the first systematic study of GC systems in fossil groups. Using data obtained with the Hubble Space Telescope Advanced Camera for Surveys in the F475W …