2005A&A...431..679M


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET03:05:56

2005A&A...431..679M - Astronomy and Astrophysics, volume 431, 679-686 (2005/2-4)

Relationship between X-ray and ultraviolet emission of flares from dMe stars observed by XMM-Newton.

MITRA-KRAEV U., HARRA L.K., GUEDEL M., AUDARD M., BRANDUARDI-RAYMONT G., KAY H.R.M., MEWE R., RAASSEN A.J.J. and VAN DRIEL-GESZTELYI L.

Abstract (from CDS):

We present simultaneous ultraviolet and X-ray observations of the dMe-type flaring stars AT Mic, AU Mic, EV Lac, UV Cet and YZ CMi obtained with the XMM-Newton observatory. During 40h of simultaneous observation we identify 13 flares which occurred in both wave bands. For the first time, a correlation between X-ray and ultraviolet flux for stellar flares has been observed. We find power-law relationships between these two wavelength bands for the flare luminosity increase, as well as for flare energies, with power-law exponents between 1 and 2. We also observe a correlation between the ultraviolet flare energy and the X-ray luminosity increase, which is in agreement with the Neupert effect and demonstrates that chromospheric evaporation is taking place.

Abstract Copyright:

Journal keyword(s): stars: chromospheres - stars: coronae - stars: flare - stars: late-type - ultraviolet: stars - X-rays: stars

Simbad objects: 6

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Number of rows : 6

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 G 272-61B Er* 01 39 01.6334059022 -17 57 01.121866655           M6V 797 0
2 V* YZ CMi Er* 07 44 40.1726285952 +03 33 08.877830321 13.761 12.831 11.225 9.958 8.263 M4.0Ve 795 0
3 NAME Proxima Centauri Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1016 0
4 V* AT Mic Er* 20 41 51.15925 -32 26 06.8283 12.753 11.909 10.343 9.098 7.383 M4.5Ve+M4.5Ve 331 0
5 V* AU Mic LM* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 930 0
6 V* EV Lac Er* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 813 2

    Equat.    Gal    SGal    Ecl

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2021.02.26-03:05:56

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