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C, N and O abundances in red clump stars of the Milky Way
Ilyin, I.; Edvardsson, B.; Tautvaišienė, G. +2 more
The Hipparcos orbiting observatory has revealed a large number of helium-core-burning ‘clump’ stars in the Galactic field. These low-mass stars exhibit signatures of extra mixing processes that require modelling beyond the first dredge-up of standard models. The 12C/13C ratio is the most robust diagnostic of deep mixing becau…
Swift/XRT observations of unidentified INTEGRAL/IBIS sources
Bird, A. J.; Fiocchi, M.; Landi, R. +4 more
The most recent IBIS/ISGRI survey, i.e. the fourth one, lists 723 hard X-ray sources, many still unidentified, i.e. lacking an X-ray counterpart or simply not studied at lower energies, i.e. below 10keV. In order to overcome this lack of X-ray information, we cross-correlated the list of IBIS sources included in the fourth IBIS catalogue with the …
Spectroscopy of z∼ 5 Lyman break galaxies in the ESO Remote Galaxy Survey
Milvang-Jensen, Bo; Bremer, M. N.; Lehnert, M. D. +2 more
We present the global results of a large spectroscopic survey carried out in order to identify z∼ 5 Lyman break galaxies (LBGs) across 10 widely separated ∼45 arcmin2 fields to a depth of IAB= 26.3. The redshifts of seventy 4.6 < z < 5.6 LBGs were identified through their Lyα emission and/or a strong continuum break, wi…
The physical scale of the far-infrared emission in the most luminous submillimetre galaxies - II. Evidence for merger-driven star formation
Wilner, David J.; Yun, Min S.; Fazio, Giovanni G. +10 more
We present high-resolution 345-GHz interferometric observations of two extremely luminous (Lir >~ 1013 Lsolar), submillimetre-selected galaxies (SMGs) in the Cosmic Evolution Survey (COSMOS) field with the Submillimeter Array (SMA). Both targets were previously detected as unresolved point sources by the SMA in …
Discovery of the 51.47-d orbital period in the supergiant fast X-ray transient XTE J1739-302 with INTEGRAL
Hill, A. B.; Bird, A. J.; Scaringi, S. +5 more
Timing analysis of ∼12.4 Ms of INTEGRAL/IBIS data has revealed a period of 51.47 ± 0.02 d in the supergiant fast X-ray transient source XTE J1739-302/IGR J17391-3021 that can be interpreted as an orbital period. An outburst history showing 35 epochs of activity has been produced, showing X-ray outbursts throughout the orbit of XTE J1739-302. Possi…
The SARS algorithm: detrending CoRoT light curves with Sysrem using simultaneous external parameters
Aigrain, Suzanne; Guillot, Tristan; Erikson, Anders +31 more
Surveys for exoplanetary transits are usually limited not by photon noise but rather by the amount of red noise in their data. In particular, although the CoRoT space-based survey data are being carefully scrutinized, significant new sources of systematic noises are still being discovered. Recently, a magnitude-dependant systematic effect was disc…
Star formation histories within the Antennae galaxies (Arp244)
Kong, Xu; Gao, Yu; Zhang, Hong-Xin
With the imagery from Galaxy Evolution Explorer, Hubble Space Telescope, Two Micron All Sky Survey and Spitzer and at the resolution of Multiband Imaging Photometer for Spitzer (MIPS) 24µm (~6arcsec), we study the variations of the broad-band spectral energy distributions of star-forming regions within the nearest prototypal major merger - t…
CoRoT photometry and high-resolution spectroscopy of the interacting eclipsing binary AU Monocerotis
Amado, P. J.; Baudin, F.; Poretti, E. +15 more
Analyses of very accurate CoRoT space photometry, past Johnson V photoelectric photometry and high-resolution echelle spectra led to the determination of improved and consistent fundamental stellar properties of both components of AU Monocerotis. We derived new, accurate ephemerides for both the orbital motion (with a period of ) and the long-term…
On the chains of star complexes and superclouds in spiral arms
Efremov, Yu. N.
We study the relation between the occurrence of a regular chain of star complexes and superclouds in a spiral arm, and other properties of the spiral arm. A regular string of star complexes is located in the north-western arm of M31; these have about the same size, 0.6 kpc with spacing of 1.1 kpc. Within the same arm segment, a regular magnetic fi…
Multiwavelength properties of a new Geminga-like pulsar: PSRJ2021+4026
Cheng, K. S.; Takata, J.; Wang, Y. +4 more
In this paper, we report on a detailed investigation of the multiwavelength properties of a newly detected γ-ray pulsar, PSRJ2021+4026, in both observational and theoretical aspects. We first identify an X-ray source in the XMM-Newton serendipitous source catalogue, 2XMMJ202131.0+402645, located within the 95 per cent confidence circle of PSRJ2021…