2013A&A...560A..69L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST18:48:58

2013A&A...560A..69L - Astronomy and Astrophysics, volume 560A, 69-69 (2013/12-1)

A multi-wavelength view of AB Doradus outer atmosphere. Simultaneous X-ray and optical spectroscopy at high cadence.

LALITHA S., FUHRMEISTER B., WOLTER U., SCHMITT J.H.M.M., ENGELS D. and WIERINGA M.H.

Abstract (from CDS):

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 ∼50000 with a time cadence of ∼1min. 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 characterised 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 Hα and CaII 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.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: coronae - stars: late-type - stars: chromospheres - stars: individual: AB Doradus A - stars: magnetic field

VizieR on-line data: <Available at CDS (J/A+A/560/A69): table1.dat table2.dat>

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 G 272-61B Er* 01 39 01.6334059022 -17 57 01.121866655           M6V 791 0
2 PKS 0515-674 Rad 05 15 37.30 -67 21 28.0           ~ 20 1
3 V* AB Dor B ** 05 28 44.4833327579 -65 26 46.034324029     13.0     M5+M5-6 87 0
4 V* AB Dor C LM* 05 28 44.83 -65 26 54.9           M8: 58 0
5 V* AB Dor TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 931 0
6 V* YZ CMi Er* 07 44 40.1726285952 +03 33 08.877830321 13.761 12.831 11.225 9.958 8.263 M4.0Ve 782 0
7 ICRF J082526.8-501038 QSO 08 25 26.86900 -50 10 38.4877   20.94       ~ 107 1
8 V* LQ Hya BY* 09 32 25.5684079124 -11 11 04.687410738 9.316 8.761 7.891 7.288 6.815 K1Vp 401 0
9 BD+20 2465 Er* 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1146 0
10 Wolf 359 Er* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 M6Ve 633 0
11 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 958 0
12 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 655 2
13 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 954 1
14 V* EV Lac Er* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 801 2
15 BD+19 5116 ** 23 31 52.17898 +19 56 14.1505 12.737 11.749 10.165 8.982 7.446 M4+M5 419 0

    Equat.    Gal    SGal    Ecl

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2020.07.16-18:48:58

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