Search Publications
Seismic analysis of HD 43587Aa, a solar-like oscillator in a multiple system
Auvergne, M.; Baudin, F.; Chaintreuil, S. +26 more
Context. The object HD 43587Aa is a G0V star observed during the 145-day LRa03 run of the COnvection, ROtation and planetary Transits space mission (CoRoT), for which complementary High Accuracy Radial velocity Planet Searcher (HARPS) spectra with S/N > 300 were also obtained. Its visual magnitude is 5.71, and its effective temperature is close…
The counterpart/s of IGR J20159+3713/SWIFT J2015.9+3715: dissecting a complex region with emission from keV to TeV
Bird, A. J.; Ubertini, P.; Landi, R. +4 more
We report on the identification of a new soft gamma-ray source, namely IGR J20159+3713/SWIFT J2015.9+3715, first detected by INTEGRAL/IBIS and then confirmed by Swift/BAT. The source, which has an observed 20-100 keV flux in the range (0.7-1.4) × 10-11 erg cm-2 s-1, encloses a Fermi variable source (2FGL J2015.6+37…
The physical conditions in IRDC clumps from Herschel/HIFI observations of H2O
Shipman, R. F.; van der Tak, F. F. S.; Wyrowski, F. +2 more
Context. The earliest phases of high-mass star formation are poorly understood.
Aims: Our goal is to determine the physical conditions and kinematic structure of massive starforming cloud clumps.
Methods: We analyse H2O 557 GHz line profiles observed with HIFI toward four positions in two infrared-dark cloud clumps. By compari…
Stellar physical parameters from Strömgren photometry. Application to the young stars in the Galactic anticenter survey
Monguió, M.; Figueras, F.; Grosbøl, P.
Aims: The aim is to derive accurate stellar distances and extinctions for young stars of our survey in the Galactic anticenter direction using the Strömgren photometric system. This will allow a detailed mapping of the stellar density and absorption toward the Perseus arm.
Methods: We developed a new method for deriving physical paramete…
Dust temperature maps of the Galactic plane: The Herschel spectral energy distribution fitting with Cloudy predictions
Huang, Maohai; Zhu, Jiali
Context. Dust grains absorb the interstellar far ultra-violet and visible photons and re-emit them in far-infrared (FIR) wavebands. The dust FIR continuum can be predicted by a grid of models using various values of the interstellar radiation field.
Aims: We analyze the dust continuum emission in two Hi-GAL science-demonstration phase (SDP) f…
Quadrant asymmetry in the angular distribution of cosmic microwave background in the Planck satellite data
Vittorio, N.; Balbi, A.; Cabella, P. +3 more
Some peculiar features found in the angular distribution of the cosmic microwave background (CMB) measured by the Wilkinson Microwave Anisotropy Probe (WMAP) deserve further investigation. Among these peculiar features is the quadrant asymmetry, which is likely related to the north-south asymmetry. In this paper, we aim to extend the analysis of t…
Time-distance helioseismology: A new averaging scheme for measuring flow vorticity
Birch, A. C.; Gizon, L.; Langfellner, J.
Context. Time-distance helioseismology provides information about vector flows in the near-surface layers of the Sun by measuring wave travel times between points on the solar surface. Specific spatial averages of travel times have been proposed for distinguishing between flows in the east-west and north-south directions and measuring the horizont…
Masses and activity of AB Doradus B a/b. The age of the AB Dor quadruple system revisited
Schmitt, J. H. M. M.; Czesla, S.; Wolter, U. +4 more
We present a multiwavelength study of the close binary AB Dor Ba/b (Rst137B). Our study comprises astrometric orbit measurements, optical spectroscopy, X-ray and radio observations. Using all available adaptive optics images of AB Dor B taken with VLT/NACO from 2004 to 2009, we tightly constrain its orbital period to 360.6 ± 1.5 days. We present t…
Symbiotic stars in X-rays. II. Faint sources detected with XMM-Newton and Chandra
Nuñez, N. E.; Mukai, K.; Luna, G. J. M. +1 more
We report the detection from four symbiotic stars that were not known to be X-ray sources. These four object show a β-type X-ray spectrum, that is, their spectra can be modeled with an absorbed optically thin thermal emission with temperatures of a few million degrees. Photometric series obtained with the Optical Monitor on board XMM-Newton from V…
Near- and mid-IR morphology of the water maser emitting planetary nebula K 3-35
Guerrero, M. A.; Lagadec, E.; Miranda, L. F. +2 more
The shaping process of planetary nebulae (PNe) takes place during the short transition from the asymptotic giant branch (AGB) phase to the white dwarf stage. The young PN K 3-35 represents a unique case where a small-sized water maser ring has been linked to the launch of collimated outflows that shape the nebula. The contrasting optical and radio…