Search Publications
The H I supershell GS 118+01-44 and its role in the interstellar medium
Noriega-Crespo, A.; Cichowolski, S.; Arnal, E. M. +3 more
Aims: We carry out a multiwavelength study to characterize the H I supershell designated GS 118+01-44, and to analyse its possible origin.
Methods: A multiwavelength study has been carried out to study the supershell and its environs. We performed an analysis of the H I, CO, radio continuum, and infrared emission distributions.
Resu…
Physical properties of Galactic Planck cold cores revealed by the Hi-GAL survey
Testi, L.; Molinari, S.; Zahorecz, S. +3 more
Context. Previous studies of the initial conditions of massive star and star cluster formation have mainly targeted infrared-dark clouds (or IRDCs) toward the inner Galaxy. This is because IRDCs were first detected in absorption against the bright mid-infrared (IR) background of the inner Galaxy, requiring a favorable location to be observed. By s…
DR Tauri: Temporal variability of the brightness distribution in the potential planet-forming region
Wolf, S.; Ratzka, Th.; Brunngräber, R. +1 more
Aims: We investigate the variability of the brightness distribution and the changing density structure of the protoplanetary disk around DR Tau, a classical T Tauri star. DR Tau is known for its peculiar variations from the ultraviolet (UV) to the mid-infrared (MIR). Our goal is to constrain the temporal variation of the disk structure based …
The radio continuum spectrum of Mira A and Mira B up to submillimeter wavelengths
Planesas, P.; Alcolea, J.; Bachiller, R.
Aims: We present new measurements of the flux densities at submillimeter wavelengths based on ALMA band 7 (338 GHz, λ0.89 mm) and band 9 (679 GHz, λ0.44 mm) observations to better constrain the origin of the continuum emission of the Mira AB binary system and to check its orbit.
Methods: We have measured the Mira A and Mira B continuum i…
Overlooked wide companions of nearby F stars
Scholz, R. -D.
Aims: We checked a sample of 545 F stars within 50 pc for wide companions using existing near-infrared and optical sky surveys.
Methods: Applying the common proper motion (CPM) criterion, we detected wide companion candidates with 6-120 arcsec angular separations by visual inspection of multi-epoch finder charts and by searching in prope…
X-ray and optical observations of four polars
Granzer, T.; Schwope, A. D.; Traulsen, I. +3 more
Aims: We investigate the temporal and spectral behaviour of four polar cataclysmic variables from the infrared to X-ray regimes, refine our knowledge of the physical parameters of these systems at different accretion rates, and search for a possible excess of soft X-ray photons.
Methods: We obtained and analysed four XMM-Newton X-ray obs…
Dust in a compact, cold, high-velocity cloud: A new approach to removing foreground emission
Kerp, J.; Lenz, D.; Flöer, L.
Context. Because isolated high-velocity clouds (HVCs) are found at great distances from the Galactic radiation field and because they have subsolar metallicities, there have been no detections of dust in these structures. A key problem in this search is the removal of foreground dust emission.
Aims: Using the Effelsberg-Bonn H I Survey and th…
Stellar classification of CoRoT targets
Deeg, H.; Deleuil, M.; Moutou, C. +4 more
Context. The CoRoT mission was the first dedicated to the search for exoplanets from space. The CoRoT exoplanet channel observed about 163 600 targets to detect transiting planetary companions. In addition to the search for exoplanets, the extremely precise photometric time series provided by CoRoT for this vast number of stars is an invaluable re…
Constraining the escape fraction of ionizing photons from H II regions within NGC 300: A concept paper
Bastian, N.; Niederhofer, F.; Hilker, M. +1 more
Using broadband photometry from the Hubble Space Telescope in combination with Very Large Telescope narrowband Hα observations of the nearby spiral galaxy NGC 300, we explore a method for estimating the escape fractions of hydrogen-ionizing photons from H II regions within this galaxy. Our goal in this concept study is to evaluate the spectral typ…
Optimal cosmic microwave background map-making in the presence of cross-correlated noise
de Bernardis, P.; Vittorio, N.; Cabella, P. +2 more
Aims: We present an extension of the ROMA map-making algorithm for the generation of optimal cosmic microwave background polarization maps. The new code allows for a possible cross-correlated noise component among the detectors of a CMB experiment. A promising application is the forthcoming LSPE balloon-borne experiment, which is devoted to t…