Search Publications
Planetary companions around the metal-poor star HIP 11952
Caffau, E.; Fedele, D.; Henning, Th. +6 more
Aims: We carried out a radial-velocity survey to search for planets around metal-poor stars. In this paper we report the discovery of two planets around HIP 11952, a metal-poor star with [Fe/H] = -1.9 that belongs to our target sample.
Methods: Radial velocity variations of HIP 11952 were monitored systematically with FEROS at the 2.2 m …
Identification of red high proper-motion objects in Tycho-2 and 2MASS catalogues using Virtual Observatory tools
Caballero, J. A.; Solano, E.; Miles-Páez, P. A. +2 more
Aims: With available Virtual Observatory tools, we looked for new M dwarfs in the solar neighbourhood and M giants with high tangential velocities.
Methods: From an all-sky cross-match between the optical Tycho-2 and the near-infrared 2MASS catalogues, we selected objects with proper motions µ > 50 mas yr-1 and very r…
Type Ia supernovae in globular clusters: observational upper limits
Nelemans, G.; Voss, R.
Aims: In the dense stellar environment of globular clusters it is expected that compact binaries can be produced dynamically. This in turn would mean that the fraction of type Ia supernovae that will explode in globular clusters will be higher than would be expected from the mass of stars present. Therefore we wish to determine observational …
On the massive young stellar object AFGL 4176. High-spatial-resolution multi-wavelength observations and modeling
Henning, T.; van Boekel, R.; Bouwman, J. +3 more
Deeply embedded and at distances of several kiloparsecs, massive young stellar objects (MYSOs) present numerous challenges for observation and study. In this work, we present spatially-resolved observations of one MYSO, AFGL 4176, together with survey and literature data, ranging from interferometric observations with VLTI/MIDI in the mid-infrared…
Redshift-space correlation functions in large galaxy cluster surveys
Clerc, N.; Valageas, P.
Context. Large ongoing and upcoming galaxy cluster surveys in the optical, X-ray and millimetric wavelengths will provide rich samples of galaxy clusters at unprecedented depths. One key observable for constraining cosmological models is the correlation function of these objects, measured through their spectroscopic redshift.
Aims: We study t…
Molecular gas and dust in the highly magnified z ~ 2.8 galaxy behind the Bullet Cluster
Bertoldi, F.; Birkinshaw, M.; Horellou, C. +8 more
Context. The gravitational magnification provided by massive galaxy clusters makes it possible to probe the physical conditions in distant galaxies that are of lower luminosity than those in blank fields and likely more representative of the bulk of the high-redshift galaxy population.
Aims: We aim to constrain the basic properties of molecul…
Herschel PACS and SPIRE observations of TW Hydrae association brown dwarf disks
Riaz, B.; Gizis, J. E.
We present Herschel SPIRE observations of the TW Hydrae association (TWA) brown dwarf disks SSSPM J1102-3431 (SS1102) and 2MASSW J1207334-393254 (2M1207). Both disks are undetected in the SPIRE 200-500 µm bands. We analyzed the archival PACS data and found no detection of either source in the 160 µm band. On the basis of radiative tran…
13CO and C18O J = 2-1 mapping of the environment of the Class 0 protostellar core SMM 3 in Orion B9
Miettinen, O.
Context. Observations of molecular spectral lines provide information on the gas kinematics and chemistry of star-forming regions.
Aims: We attempt to achieve a better understanding of the gas distribution and velocity field around the deeply embedded Class 0 protostar SMM 3 in the Orion B9 star-forming region.
Methods: Using the APEX 12…
The nature of the high Galactic latitude O-star HD 93521: new results from X-ray and optical spectroscopy
Morel, T.; Rauw, G.; Palate, M.
Context. Owing to its unusual location and its isolation, the nature of the high Galactic latitude O9.5 Vp object HD 93521 is still uncertain.
Aims: We have collected X-ray and optical observations to characterize the star and its surroundings.
Methods: X-ray images and spectra are analysed to search for traces of a recent star formation…
NGC 3627: a galaxy-dwarf collision?
Bomans, D. J.; Weżgowiec, M.; Soida, M.
Context. Group galaxies very often show distinct signs of interaction with both companion galaxies and the intragroup medium. X-ray observations are particularly helpful because they provide information on the temperatures and the densities of the hot gas in galaxies and intergalactic space. This can put important constraints on the nature and tim…