Resumo

LIšKA, J. et al. Czev502 - An M Dwarf Near the Leo Triplet With Very Strong Flares. Rev. mex. astron. astrofis [online]. 2022, vol.58, n.1, pp.155-168.  Epub 23-Jan-2023. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2022.58.01.12.

Discovery of fares 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 B -V of 1.5 mag, Hα emission, and fares. Our monitoring revealed only one reliable and one suspected superflare in 58 nights (210 hrs). The strongest are with ΔR = 1:5 mag (ΔB ≈6-8 mag) could have a total energy of 3E+34 erg. The ASAS-SN data may contain 4 events up to ΔV 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 1 600 photographic plates. The upper rate limit of 1-2 superares/1 640 hrs corresponds to activity several orders higher than for other M-dwarfs, especially, for the slow rotators. The low amplitude ares (ΔB < 0:5 mag) may be common (1 are/4 hrs).

Palavras-chave : surveys.

        · resumo em Espanhol     · texto em Inglês     · Inglês ( pdf )