2007A&A...462L..41S


Query : 2007A&A...462L..41S

2007A&A...462L..41S - Astronomy and Astrophysics, volume 462, L41-44 (2007/2-2)

Discovery of variable X-ray absorption in the cTTS AA Tauri.

SCHMITT J.H.M.M. and ROBRADE J.

Abstract (from CDS):

We present XMM-Newton X-ray and UV observations of the classical T Tauri star AA Tau covering almost two rotational periods where Prot∼8.5days. Clear, but uncorrelated variability is found at both wavebands. The variability observed at ∼2100Å follows the previously known optical period. Spectral analysis of the X-ray data results in significant variability in the X-ray absorption such that the times of maximal X-ray absorption and UV extinction coincide. Placing the coronal emission in regions at low up to moderate magnetic latitudes and attribution of the variable X-ray absorption to accretion curtains and/or the disk warp provides a consistent physical picture. However, the derived X-ray absorption and optical extinction at times of maximal optical/UV brightness, i.e. outside occultation, are difficult to reconcile, requiring additional absorption in a disk wind or a peculiar dust grain distribution.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: pre-main sequence - stars: coronae - stars: activity

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* BP Tau Or* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 621 0
2 V* DG Tau Or* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 960 1
3 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 822 0
4 TYC 1833-884-1 * 04 34 36.5022003103 +24 34 29.464738545   12.55 12.04     A7 4 0
5 TYC 1833-574-1 * 04 34 45.1091876922 +24 24 43.152902836   12.57 11.62     G8 6 0
6 V* AA Tau Or* 04 34 55.4222683130 +24 28 53.038273587 13.14 13.34 12.20     K5Ve 656 0
7 V* SU Aur Or* 04 55 59.3861369488 +30 34 01.499800471   10.33 9.30 9.17   G2IIIne 549 0
8 HH 2 HH 05 36.4 -06 47           ~ 336 1
9 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1642 1
10 HD 319139 LM* 18 14 10.4818974563 -32 47 34.516106830   11.47 10.68   9.11 K5+K7 309 0

    Equat.    Gal    SGal    Ecl

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2021.07.29-18:10:33

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