Search Publications
The evolution of M 2-9 from 2000 to 2010
Balick, B.; Corradi, R. L. M.; Santander-García, M.
Context. Understanding the formation of collimated outflows is one of the most debated and controversial topics in the study of the late stages of stellar evolution.
Aims:
The 2XMMi/SDSS Galaxy Cluster Survey. I. The first cluster sample and X-ray luminosity-temperature relation
Takey, A.; Schwope, A.; Lamer, G.
We present a catalogue of X-ray selected galaxy clusters and groups as a first release of the 2XMMi/SDSS Galaxy Cluster Survey. The survey is a search for galaxy clusters detected serendipitously in observations with XMM-Newton in the footprint of the Sloan Digital Sky Survey (SDSS). The main aims of the survey are to identify new X-ray galaxy clu…
Water in low-mass star-forming regions with Herschel (WISH-LM). High-velocity H2O bullets in L1448-MM observed with HIFI
Liseau, R.; van Dishoeck, E. F.; Bachiller, R. +4 more
Herschel-HIFI observations of water in the low-mass star-forming object L1448-MM, known for its prominent outflow, are presented, as obtained within the "Water in star-forming regions with Herschel" (WISH) key programme. Six H216O lines are targeted and detected (Eup/kB ~ 50-250 K), as is CO J = 10-9 (E<…
The magnitude difference between the main sequence turn off and the red giant branch bump in Galactic globular clusters
Salaris, M.; Pietrinferni, A.; Monelli, M. +3 more
We present new measurements of the magnitude of the main sequence turn off and the red giant branch bump in the luminosity function of a sample of Galactic globular clusters with updated estimates of [Fe/H] and [α/Fe], employing photometric data collected with the Advanced Camera for Survey onboard the HST. We compare measured and predicted values…
A chemical inventory of the S-type AGB star χ Cygni based on Herschel/HIFI observations of circumstellar line emission. The importance of non-LTE chemical processes in a dynamical region
Olofsson, H.; Justtanont, K.; de Koter, A. +5 more
Context. S-type AGB stars (C/O ≈ 1) are thought to be transition objects from M-type (O-rich) AGB stars to carbon stars and as such are interesting objects in themselves. Of particular interest is to determine accurate circumstellar properties and molecular abundances, due to their predicted sensitivity to the photospheric C/O-ratio.
Aims: Pr…
The debris disk host star HD 61005: a member of the Argus association?
Alcalá, J. M.; Lanzafame, A. C.; Brugaletta, E. +6 more
Context. HD 61005 is a nearby young solar type star that shows a large infrared excess due to a debris disk. The disk has been recently imaged from ground and space, with indications of several components. Some characteristics of the disk suggest the presence of planetary companions around the star, that remain undetected in deep adaptive optics i…
The influence of binarity on dust obscuration events in the planetary nebula M 2-29 and its analogues
Rauch, T.; Udalski, A.; Cohen, M. +8 more
The central star of the planetary nebula (CSPN) M 2-29 shows an extraordinary R Coronae Borealis-like fading event in its optical lightcurve. The only other CSPN to show these events are CPD-56°8032 (Hen 3-1333) and V651 Mon (NGC 2346). Dust cloud formation in the line of sight appears responsible but the exact triggering mechanism is not well und…
Using the Sun to estimate Earth-like planets detection capabilities . III. Impact of spots and plages on astrometric detection
Meunier, N.; Lagrange, A. -M.; Desort, M. +1 more
Aims: Stellar activity is a potentially important limitation to the detection of low-mass extrasolar planets with indirect methods (radial velocity, photometry, astrometry). In previous papers, using the Sun as a proxy, we investigated the impact of stellar activity (spots, plages, convection) on the detectability of an Earth-mass planet in t…
Galactic distributions of carbon- and oxygen-rich AGB stars revealed by the AKARI mid-infrared all-sky survey
Matsunaga, N.; Onaka, T.; Kaneda, H. +3 more
Context. The environmental conditions for asympotic giant branch (AGB) stars to reach the carbon-rich (C-rich) phase are important to understand the evolutionary process of AGB stars. The difference between the spatial distributions of C-rich and oxygen-rich (O-rich) AGB stars is essential for the study of the Galactic structure and the chemical e…
X-ray spectral properties of Seyfert galaxies and the unification scheme
Singh, V.; Risaliti, G.; Shastri, P.
Context. The unification scheme of Seyfert galaxies predicts that the observed differences between types 1 and 2 Seyfert galaxies are solely due to the differing orientations of the toroidal-shaped obscuring material around AGN. The observed X-ray spectra of Seyfert type 2s compared to type 1s are expected to be affected by higher absorbing column…