Simultaneous X-ray and optical monitoring of the flare star YZ CMi
نویسندگان
چکیده
منابع مشابه
A major optical flare on the recently discovered X - ray active dMe star G 102 - 21
During the course of UBV photoelectric measurements made at the Catania Astrophysical Observatory we have observed an unusually intense optical flare on the nearby M dwarf G 102-21, the optical counterpart of a strong X-ray source recently detected by ROSAT. The amplitude of the magnitude increase (∆U ∼ 7.3 mag) and the total energy release in the UBV bands (E UBV ∼ (1.4 ± 0.3) × 10 35 erg) put...
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CP Tuc (AX J2315–592) shows a dip in X-rays which lasts for approximately half the binary orbit and is deeper in soft X-rays compared with hard X-rays. It has been proposed that this dip is due to the accretion stream obscuring the accretion region from view. If CP Tuc was a polar, as has been suggested, then the length of such a dip would make it unique amongst polars since in those polars in ...
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We present a ROSAT High Resolution Imager (HRI) observation of the star forming region NGC 2264. The analysis has detected more than 40 X-ray sources with Lx in the range 10 30 ?10 31 erg/sec. The high spatial resolution of the detector allows us to resolve sources that were confused in previous IPC and PSPC observations of the same region. Moreover, we have performed CCD photometric observatio...
متن کاملSimultaneous optical and X - ray observations of a giant flare on the ultracool dwarf LP 412 - 31
Cool stars are known to produce flares probably as a result of magnetic reconnection in their outer atmospheres. We present simultaneous XMM-Newton optical V band and X-ray observations of the M8 dwarf LP 412-31. During the observation a giant flare occurred, with an optical amplitude of 6 mag and total energy of 3 · 10 32 erg in each the V band and soft X-rays. Both flare onset and flare decay...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1986
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/223.1.1p