Castor A and Castor B resolved in a simultaneous Chandra and XMM-Newton observation

  title={Castor A and Castor B resolved in a simultaneous Chandra and XMM-Newton observation},
  author={Beate Stelzer and Vadim Burwitz},
  journal={Astronomy and Astrophysics},
We present a simultaneous Chandra and XMM-Newtonobservation of the Castor sextett, focusing on Castor A and Castor B, two spectroscopic binaries with early-type primaries. Our study represents the first unambiguous X-ray detection of all three visual components in the Castor sextett making use of the unprecedented spatial resolution of Chandra. Of the present day X-ray instruments only Chandra can isolate the X-ray lightcurves and spectra of Castor A and B (angular separation4 00 ). We compare… Expand
Suzaku Detection of an Intense X-Ray Flare from an A-Type Star, HD161084
We report on a serendipitous detection of an intense X-ray flare from the Tycho reference source on HD 161084 during a Suzaku observation of the galactic center region for � 20 ks. The X-ray ImagingExpand
Spatially resolved X-ray emission of EQ Pegasi
We present an analysis of an XMM-Newton observation of the M dwarf binary EQ Pegasi with a special focus on the spatial structure of the X-ray emission and the analysis of light curves. Making use ofExpand
Highlights from XMM-Newton
The launch of the Chandra (NASA) and XMM-Newton (ESA) X-ray observatories in 1999 has revolutionized our view of the Universe, by providing astrophysical information about many classes of sourcesExpand
A 3D model for α$\alpha$ Gem AB: orbits and dynamics
The well-known multiple star system, Castor, and particularly, the [(Aa, Ab), (Ba, Bb)] subsystem, was studied in detail. After a rigorous analysis of the quality controls, a new solution for theExpand
Nearby stars of the Galactic disc and halo – IV
The Milky Way Galaxy has an age of about 13 billion years. Solar-type stars evolve all the long way to the realm of degenerate objects on essentially this time-scale. This, as well as the particularExpand
No detection of large-scale magnetic fields at the surfaces of Am and HgMn stars
Aims. We investigate the magnetic dichotomy between Ap/Bp and other A-type stars by carrying out a deep spectropolarimetric study of Am and HgMn stars. Methods. Using the NARVAL spectropolarimeter atExpand
Astrophysics in 2003
Five coherent sections appear this year, addressing solar physics, cosmology (with WMAP highlights), gamma-ray bursters (and their association with Type Ia supernovae), extra-solar-system planets,Expand
Apparent and Absolute Magnitudes of Stars: A Simple Formula
An empirical formula for estimating the apparent and absolute magnitudes of stars in terms of the parameters radius, distance and temperature is proposed for the first time for the benefit of theExpand


An ASCA observation of the Castor system
We report on a day-long ASCA broadband (1-10 keV) spectro-imaging observation of the X-ray emission from the Castor multibinary system. Significant flares were detected from both the flare starExpand
The XMM-Newton view of stellar coronae: Coronal structure in the Castor X-ray triplet
We present results of a comprehensive X-ray investigation of the multiple stellar system Castor AB + YY Gem. The observations were obtained with the XMM - Newton observatory. We report the firstExpand
Simultaneous X-ray spectroscopy of YY Gem with Chandra and XMM-Newton
We report on a detailed study of the X-ray spectrum of the nearby eclipsing spectroscopic binary YY Gem. Observations were obtained simultaneously with both large X-ray observatories, XMM-Newton andExpand
The XMM-Newton View of Stellar Coronae: High-Resolution X-Ray Spectroscopy of Capella
We present the high-resolution RGS X-ray spectrum of the stellar binary Capella observed by the XMM- Newton satellite. A multi-thermal approach has rst been applied to t the data and derive elementalExpand
High-resolution X-ray spectroscopy of Procyon by Chandra and XMM-Newton
We report the analysis of the high-resolution soft X-ray spectrum of the nearby F-type star Procyon in the wavelength range from 5 to 175 A obtained with the Low Energy Transmission GratingExpand
CHANDRA-LETGS X-ray observations of Capella. Temperature, density and abundance diagnostics
We report an analysis of the X-ray spectrum of Capella from 6 to 175 Å obtained with the Low Energy Transmission Grating Spectrometer (LETGS) on board of the X-ray space observatory CHANDRA. ManyExpand
Coronal density diagnostics with Helium-like triplets: CHANDRA-LETGS observations of Algol, Capella, Procyon, epsilon Eri, alpha Cen A&B, UX Ari, AD Leo, YY Gem, and HR 1099
The authors' LETGS spectra are found to be an extremely useful tool for plasma diagnostics of stellar coronae and a correlation between line flux ratios of the Ly and He-like resonance lines with the mean X-ray surface flux is found. Expand
X-Ray Evidence for Flare Density Variations and Continual Chromospheric Evaporation in Proxima Centauri
Using the XMM-Newton X-ray observatory to monitor the nearest star to the Sun, Proxima Centauri, we recorded the weakest X-ray flares on a magnetically active star ever observed. Correlated X-ray andExpand
X-ray/microwave relation of different types of active stars
Coronal active stars of seven classes between spectral types F and M, single and double, are compared in their quiescent radio and X-ray luminosities L(R) and L(X). We find, largely independent ofExpand
Line ratios for helium-like ions: Applications to collision-dominated plasmas ?
The line ratios R and G of the three main lines of He-like ions (triplet: resonance, intercombination, forbidden lines) are calculated for C v ,N vi ,O vii ,N eix ,M gxi, and Si xiii. These ratiosExpand