Coronal stripping in supersaturated stars
نویسندگان
چکیده
منابع مشابه
Coronal stripping in supersaturated stars
A recent unambiguous detection of X-ray rotational modulation of the supersaturated star VXR45 (P = 0.223 days) has shown that its corona has discrete dark and bright X-ray regions. We suggest that due to the rapid rotation, the X-ray emitting corona has been centrifugally stripped away, creating open field regions that are dark in X-rays. This leads naturally both to a significant rotational m...
متن کاملChromospheric and Coronal Activity in the 500myr Old Open Cluster M37: Evidence for Coronal Stripping?
We present the results of a spectroscopic survey to characterize chromospheric activity, as measured by a H emission, in low-mass members of the 500Myr old open cluster M37. Combining our new measurements of a H luminosities ( a LH ) with previously cataloged stellar properties, we identify saturated and unsaturated regimes in the dependence of the a LH -to-bolometric luminosity ratio, a L L H ...
متن کاملCoronal Structure of Pre-Main Sequence Stars
The study of pre-main sequence stellar coronae is undertaken in many different wavelength regimes, with apparently conflicting results. X-ray studies of T Tauri stars suggest the presence of loops with a range of sizes ranging from less than a stellar radius to 10 stellar radii. Some of these stars show a clear rotational modulation in X-rays, but many do not and indeed the nature of this emiss...
متن کاملCoronal versus photospheric abundances of stars with different activity levels
We report a detailed analysis of the coronal abundance of 4 stars with varying levels of activity and with accurately known photospheric abundances. The coronal abundance is determined here using a line flux analysis and a full determination of the differential emission measure. Photospheric abundance values are taken from the literature. Previous coronal abundance determinations have generally...
متن کاملCoronal properties of nearby old disk and halo dM stars
ROSATX-ray (PSPC) andEUV(WFC)observations of a sample of 12 nearbyHalo andOld-Disk lowmass stars have been analyzed to determine their emission levels, properties of their coronal spectra and to characterize their temporal variations on time scales from hours to ten years. The light curves of the old-disk stars of our sample with the highest count statistics, show that variability of a factor t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20031723