Search Publications
γ Doradus pulsation in two pre-main sequence stars discovered by CoRoT
Chaintreuil, S.; Ryabchikova, T.; Fossati, L. +5 more
Context. Pulsations in pre-main sequence stars have been discovered several times within the last years. But nearly all of these pulsators are of δ Scuti-type. γ Doradus-type pulsation in young stars has been predicted by theory, but lack observational evidence.
Aims: We present the investigation of variability caused by rotation and (γ Dorad…
The most complete and detailed X-ray view of the SNR Puppis A
Rodríguez-Pascual, P.; Giacani, E.; Smith, M. J. S. +3 more
Aims: With the purpose of producing the first detailed full view of Puppis A in X-rays, we carried out new XMM-Newton observations covering the missing regions in the southern half of the supernova remnant (SNR) and combined them with existing XMM-Newton and Chandra data.
Methods: Two pointings toward the south and southwest of Puppis A …
Dancing in the Dark: New Brown Dwarf Binaries from Kernel Phase Interferometry
Martinache, Frantz; Tuthill, Peter; Pope, Benjamin
This paper revisits a sample of ultracool dwarfs in the solar neighborhood previously observed with the Hubble Space Telescope's NICMOS NIC1 instrument. We have applied a novel high angular resolution data analysis technique based on the extraction and fitting of kernel phases to archival data. This was found to deliver a dramatic improvement over…
Two new ultracool benchmark systems from WISE+2MASS
Marocco, F.; Pinfield, D. J.; Jones, H. R. A. +6 more
We have used the Two-Micron All-Sky Survey and the Wide-field Infrared Survey Explorer to look for ultracool dwarfs that are part of multiple systems containing main-sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems. The first system, G255-34AB, is an L2 dwarf companion to…
Cold gas in the inner regions of intermediate redshift clusters
Jablonka, P.; Combes, F.; Rines, K. +2 more
Determining the nature and modes of star formation at galactic scales requires an understanding of the relationship between the gas content of a galaxy and its star formation rate. Remarkable progress has been made in understanding the conversion mechanisms in field galaxies, but the cold and dense gas fueling the star formation in galaxies inside…
The ACS Nearby Galaxy Survey Treasury. XI. The Remarkably Undisturbed NGC 2403 Disk
Skillman, Evan D.; Williams, Benjamin F.; Dolphin, Andrew +3 more
We present detailed analysis of color-magnitude diagrams of NGC 2403, obtained from a deep (m <~ 28) Hubble Space Telescope (HST) Wide Field Planetary Camera 2 observation of the outer disk of NGC 2403, supplemented by several shallow (m <~ 26) HST Advanced Camera for Surveys fields. We derive the spatially resolved star formation history of…
Pulse-phase-resolved Spectroscopy of Vela X-1 with Suzaku
Maitra, Chandreyee; Paul, Biswajit
We present a detailed pulse-phase-resolved spectral analysis of the persistent high-mass X-ray binary pulsar Vela X-1 observed with Suzaku during 2008 June. The pulse profiles exhibit both intensity and energy dependence with multiple peaks at low energies and double peaks at higher energies. The source shows some spectral evolution over the durat…
The Age and Stellar Parameters of the Procyon Binary System
Liebert, James; Williams, Kurtis A.; Fontaine, Gilles +2 more
The Procyon AB binary system (orbital period 40.838 yr, a newly refined determination) is near and bright enough that the component radii, effective temperatures, and luminosities are very well determined, although more than one possible solution to the masses has limited the claimed accuracy. Preliminary mass determinations for each component are…
Herschel-ATLAS: Planck sources in the phase 1 fields
Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +32 more
We present the results of a cross-correlation of the Planck Early Release Compact Source catalogue (ERCSC) with the catalogue of Herschel-ATLAS sources detected in the phase 1 fields, covering 134.55°2. There are 28 ERCSC sources detected by Planck at 857 GHz in this area. As many as 16 of them are probably high Galactic latitude cirrus…
X-Ray Groups of Galaxies in the AEGIS Deep and Wide Fields
Finoguenov, A.; Nandra, K.; Laird, E. +19 more
We present the results of a search for extended X-ray sources and their corresponding galaxy groups from 800 ks Chandra coverage of the All-wavelength Extended Groth Strip International Survey (AEGIS). This yields one of the largest X-ray-selected galaxy group catalogs from a blind survey to date. The red-sequence technique and spectroscopic redsh…