X-ray deficiency on strongly accreting T Tauri stars
نویسندگان
چکیده
منابع مشابه
X-ray emission from T Tauri stars
We have modelled the X-ray emission of T Tauri stars assuming that they have isothermal, magnetically-confined coronae. These coronae extend outwards until either the pressure of the hot coronal gas overcomes the magnetic field, or, if the corona interacts with a disk before this happens, by the action of the disk itself. This work is motivated by the results of the Chandra Orion Ultradeep Proj...
متن کاملX-ray Diagnostics of Grain Depletion in Matter Accreting onto T Tauri Stars
Recent analysis of high resolution Chandra X-ray spectra has shown that the Ne/O abundance ratio is remarkably constant in stellar coronae. Based on this result, we point out the utility of the Ne/O ratio as a discriminant for accretionrelated X-rays from T Tauri stars, and for probing the measure of grain-depletion of the accreting material in the inner disk. We apply the Ne/O diagnostic to th...
متن کاملThe X-ray soft excess in classical T Tauri stars
Aims. We study an anomaly in the X-ray flux (or luminosity) ratio between the Ovii λλ21.6-22.1 triplet and the Oviii Lyα line seen in classical T Tauri stars (CTTS). This ratio is unusually high when compared with ratios for mainsequence and non-accreting T Tauri stars (Telleschi et al. 2007). We compare these samples to identify the source of the excess. A sample of recently discovered X-ray s...
متن کاملRotationally Modulated X-ray Emission from T Tauri Stars
We have modelled the rotational modulation of X-ray emission from T Tauri stars assuming that they have isothermal, magnetically confined coronae. By extrapolating surface magnetograms we find that T Tauri coronae are compact and clumpy, such that rotational modulation arises from X-ray emitting regions being eclipsed as the star rotates. Emitting regions are close to the stellar surface and in...
متن کاملMultiplicity of X-Ray Selected T Tauri Stars in Chamaeleon
We report on a multiplicity survey of a sample of X-ray selected young stars in the Chamaeleon association. We used speckle-interferometry and direct imaging to find companions in the separation range 0.13 to 6. After correction for chance alignment with background stars, we find a multiplicity (number of binaries or multiples divided by number of systems) of (14.0 ± 4.3)% and a companion star ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2016
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201527383