간행물
천문학회지 KCI 등재 SCOPUS Journal of The Korean Astronomical Society
- 발행기관 한국천문학회
- 자료유형 학술지
- 간기 반년간
- ISSN 1225-4614 (Print)2288-890X (Online)
- 수록기간 1968 ~ 2026
- 주제분류 자연과학 > 천문학 자연과학 분류의 다른 간행물
- 십진분류KDC 440DDC 520
권호리스트/논문검색
제59권 제2호 (2026년 7월) 1건
1.
2026.07
구독 인증기관 무료, 개인회원 유료
Younghun Oh, Seo-Won Chang, Jongchul Chae, Juhyung Kang, Soosang Kang, Kyeore Lee, Kyoung-Sun Lee, Eun-Kyung Lim, Hyun-Il Sung
Active M dwarfs exhibit frequent and energetic flares that provide a unique laboratory for studying chromospheric heating processes under extreme magnetic activity. To probe the flare process of M-dwarfs, we present a high-resolution (R ∼ 30,000) spectroscopic case study of a superflare onADLeo, detected on 2023 March 14 using the Bohyunsan Optical Echelle Spectrograph (BOES). Such high-energy events are rarely captured with simultaneous multi-line spectroscopy, allowing us to trace the energy partition and temporal evolution of the chromospheric lines. Based on equivalent width variations, we found that the Hα line radiated 8.8×1030 erg, implying a total bolometric energy (∼1033 erg) comparable to the largest solar flares. The Balmer series dominated the energy budget; the individual Ca ii H and K lines contributed 47.5% and 26.2% of the Hα energy, respectively, while each Ca ii infrared triplet line emitted ∼17–19%. We confirm that the delayed peak emission, previously reported for Ca ii H&K, also occurs in the Ca ii triplet and Na i lines. These delays are consistent with the Neupert effect, suggesting that cumulative heating governs the gradual phase emission. While this superflare resembled solar flares in its general morphology, it also displayed systematic differences in chromospheric emission. It is likely that these differences reflect the distinct atmospheric structure and quiescent chromospheric conditions of M dwarfs, rather than fundamentally different flare physics.
4,500원
