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A multi-wavelength view of AB Dor's outer atmosphere - Simultaneous X-ray and optical spectroscopy at high cadence | | S. Lalitha
; B. Fuhrmeister
; U. Wolter
; J. H. M. M. Schmitt
; D. Engels
; M. H. Wieringa
; | | Date: |
19 Sep 2013 | | Abstract: | We study the chromosphere and corona of the ultra-fast rotator AB Dor A at
high temporal and spectral resolution using simultaneous observations with
XMM-Newton in the X-rays, VLT/UVES in the optical, and the ATCA in the radio.
Our optical spectra have a resolving power of ~50 000 with a time cadence of ~1
min. Our observations continuously cover more than one rotational period and
include both quiescent periods and three flaring events of different strengths.
From the X-ray observations we investigated the variations in coronal
temperature, emission measure, densities, and abundance. We interpreted our
data in terms of a loop model. From the optical data we characterise the
flaring chromospheric material using numerous emission lines that appear in the
course of the flares. A detailed analysis of the line shapes and line centres
allowed us to infer physical characteristics of the flaring chromosphere and to
coarsely localise the flare event on the star. We specifically used the optical
high-cadence spectra to demonstrate that both, turbulent and Stark broadening
are present during the first ten minutes of the first flare. Also, in the first
few minutes of this flare, we find short-lived (one to several minutes)
emission subcomponents in the H{alpha} and Ca ii K lines, which we interpret
as flare-connected shocks owing to their high intrinsic velocities. Combining
the space-based data with the results of our optical spectroscopy, we derive
flare-filling factors. Finally, comparing X-ray, optical broadband, and line
emission, we find a correlation for two of the three flaring events, while
there is no clear correlation for one event. Also, we do not find any
correlation of the radio data to any other observed data. | | Source: | arXiv, 1309.4933 | | Services: | Forum | Review | PDF | Favorites | |
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