4568203
doi
10.5281/zenodo.4568203
oai:zenodo.org:4568203
user-coolstars20half
AstroSat observations of long-duration X-ray superflares on active M-dwarf binary EQ Peg
Karmakar, Subhajeet
Physical Research Laboratory
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
stars: activity
stars: coronae
stars: flare
EQ Peg
stars: low-mass
stars: magnetic field
<p>We present a comprehensive study of three large long-duration flares detected on an active M-dwarf binary EQ Peg using Soft X-Ray Telescope of the AstroSat observatory. The peak X-ray luminosities of the flares in the 0.3 -- 7 keV band are found to be within ~4-10 × 10^{30} erg s^{-1}. Spectral analysis indicates the presence of three temperature corona with the first two plasma temperatures remain constant during all the flares and the post-flare. The flare-temperature peaked at 56, 40, and 31 MK, which are 2.5, 1.8, and 1.4 times more than the minimum value, respectively. The peak emission measures are found to be 1.16 -- 5.64 × 10^{53} cm^{-3}, whereas the abundances peaked at 0.7 -- 1.2 times the solar abundances. Using quasi-static loop modeling, we derive loop-lengths for all the flares as 2.7 ± 1.4 × 10^{11}, 3.9 ± 1.5 × 10^{11}, and 6.4 ± 2.4 × 10^{11} cm, respectively. The estimated energies of all three flares are >10^{33-35} erg, putting them in the category of Superflare. All three superflares are also found to be the longest duration flares ever observed on EQ Peg.</p>
Zenodo
2021-02-27
info:eu-repo/semantics/conferencePoster
4568202
user-coolstars20half
1614472035.794503
1748860
md5:516ce3d23085758b2607ff4f0c35fdcd
https://zenodo.org/records/4568203/files/Poster_CoolStars20.5_Subhajeet_Karmakar.pdf
public
10.5281/zenodo.4568202
isVersionOf
doi