Czev502 - an M dwarf near the Leo Triplet with very strong flares

0556788 - ASÚ 2023 RIV MX eng J - Článek v odborném periodiku
Liška, J. - Hudec, René - Mikulášek, Z. - Zejda, M. - Janík, J. - Štrobl, Jan
Czev502 - an M dwarf near the Leo Triplet with very strong flares.
Revista Mexicana de Astronomia y Astrofisica. Roč. 58, č. 1 (2022), s. 155-168. ISSN 0185-1101
Institucionální podpora: RVO:67985815
Klíčová slova: white-light flares * variable-stars * x-ray
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 1, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.22201/ia.01851101p.2022.58.01.12

Discovery of flares in the M dwarf CzeV502 and our follow-up results are presented. We classify it as a dMe eruptive variable of UV Ceti type due to the X-ray activity, measured BV of 1.5 mag, H alpha emission, and flares. Our monitoring revealed only one reliable and one suspected superflare in 58 nights (210 hrs). The strongest flare with Delta R = 1.5 mag (Delta B approximate to 6-8 mag) could have a total energy of 3E+34 erg. The ASAS-SN data may contain 4 events up to Delta V of 0.43 mag and 12.55 d periodicity corresponding to the rotation or possible binarity. Other brightenings in sky survey (ASAS-3, CRTS, NSVS, and KWS) are doubtful. No event was unveiled on the 1600 photographic plates. The upper rate limit of 1-2 superflares/1 640 hrs corresponds to activity several orders higher than for other M-dwarfs, especially, for the slow rotators. The low amplitude flares (Delta B < 0.5 mag) may be common (1 flare/4 hrs).
Trvalý link: http://hdl.handle.net/11104/0331648