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HD 218733


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EUV activity in late-type stars during the ROSAT WFC All-Sky Survey - I. Techniques and initial results
We study 127 active late-type stars, including the well-known flarestars, in the extreme ultraviolet (EUV) region of the electromagneticspectrum, using the ROSAT Wide Field Camera (WFC) survey observations.Our analysis includes photometry for all the stars in the sample, timinganalysis of the observed photon events, and a statistical analysis forpossible small-scale, low-level variability. 49 stars in our sample weredetected in one or both EUV wavebands. A total of 35 flares were seen,from 23 stars, not all of them well-known flare stars. In addition,about half of the detections exhibited low-level variability. Furtheranalysis reveals that the observed low-level variability was not due torotational or orbital modulation, but rather was related to small-scaleactivity on the stars, possibly in the form of small-amplitude,flare-like events which were too faint to be recognized as individualflares at the sensitivity of the WFC. We call this low-level activity`milliflaring'. We also give estimated upper-limit count rates for thenon-detections.

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Observation and Astrometry data

Constellation:ちょうこくしつ座
Right ascension:23h10m30.39s
Declination:-28°25'43.0"
Apparent magnitude:8.461
Distance:227.79 parsecs
Proper motion RA:-9.1
Proper motion Dec:-16.7
B-T magnitude:8.971
V-T magnitude:8.504

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 218733
TYCHO-2 2000TYC 6978-182-1
USNO-A2.0USNO-A2 0600-44443033
HIPHIP 114433

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