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The Thermal radiation of the isolated neutron star RX J1856.5-3754 observed with Chandra and XMM-Newton
We present results of the analysis of data collected in 57-ks XMM-Newton and 505-ks Chandra observations of the nearby ($\simeq $120 pc) isolated neutron star RX J1856.5–3754. We confirm most of theExpand
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Evidence for a co-moving sub-stellar companion of GQ Lup
We present a companion of the ≤2 Myr young classical T Tauri star GQ Lup in the Lupus star forming region at 140 ± 50 pc from imaging, astrometry, and spectroscopy. With direct K-band imaging usingExpand
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X-ray emission from young stars in Taurus-Auriga-Perseus: Luminosity functions and the rotation - activity - age - relation
We report on a systematic search for X-ray emission from pre-main sequence and young main sequence stars in the Taurus-Auriga-Perseus region. Our stellar sample consists of all T Tauri stars from theExpand
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Masses and luminosities of O- and B-type stars and red supergiants
Massive stars are of interest as progenitors of supernovae, i.e. neutron stars and black holes, which can be sources of gravitational waves. Recent population synthesis models can predict neutronExpand
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Search for young stars among ROSAT All-Sky Survey X-ray sources in and around the R CrA dark cloud ⋆
We present the ROSAT All-Sky Survey data in a 126 deg 2 area in and around the CrA star forming region. With low-resolution spectroscopy of unidentied ROSAT sources we could nd 19 new pre-mainExpand
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Toward a mass and radius determination of the nearby isolated neutron star RX J185635-3754
We discuss efforts to determine the mass, radius, and surface composition of the nearby compact object RX J185635-3754 from its multiwavelength spectral energy distribution. We compute nonmagnetizedExpand
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New low-mass members of the Lupus 3 dark cloud : further indications of pre-main-sequence evolution strongly affected by accretion.
A spectroscopic survey of a small area at the center of the Lupus 3 star-forming core has revealed four new mid-to-late M-type members, including a M7.5 brown dwarf. One of the new members,Expand
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New weak-line T Tauri stars in Lupus (Krautter+ 1997)
We present first results obtained by a survey of the Lupus star forming region in search of new T Tauri stars. This study has been performed on the basis of deep pointed ROSAT observations in theExpand
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Gl 86B: a white dwarf orbits an exoplanet host star
In this Letter we present our first high-contrast observations of the exoplanet host star Gl 86 using NAOS-CONICA (NACO) and its new Simultaneous Differential Imager (SDI) as well as results fromExpand
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The Chandra LETGS high resolution X-ray spectrum of the isolated neutron star RX J1856.5-3754
We present the Chandra LETGS X-ray spectrum of the nearby (~60 pc) neutron star RX J1856.5-3754. Detailed spectral analysis of the combined X-ray and optical data rules out the nonmagnetic neutronExpand
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