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CN Com: a Typical RS Canum Venaticorum Star

Published online by Cambridge University Press:  12 April 2016

G.A. Richter  and
J. Greiner
G.A. Richter
Affiliation:
Sternwarte Sonneberg, 96515 Sonneberg, Germany
J. Greiner
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, 85740 Garching, Germany

Extract

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CN Com = CSV 6907 was dicovered by Romano (1958). First we note that the GCVS (and Simbad) coordinates are wrong by ≈2′. Using the finding chart of Romano (1958) and the APM data (digitized POSS), the correct coordinates of CN Com are R.A.(2000.0) = 12h19m47s.0, DEC(2000.0) = +16°30′50″.

CN Com is only 8″ distant from the ROSAT X-ray source RX J1219.7+1630 detected during the All-Sky-Survey at a PSPC countrate of 0.022 cts/s. Due to the positional proximity and the absence of other optical objects brighter than 20rmm within the about 30″ error circle, CN Com is very probably the optical counterpart of RX J1219.7+1630.

CN Com was investigated on some 600 photographic plates (Sonneberg astrographs 400/1600 mm and 400/2000 mm) of the fields 26 Com and 5 Com, covering the time interval from 1962 to 1994 (with only a very few plates from the years 1967-1974).

Type
Flares in Late-type Stars: Radio and Optical
Information
International Astronomical Union Colloquium , Volume 151: Flares and Flashes , 1995 , pp. 106 - 107
Copyright
Copyright © Springer-Verlag 1995

References

Meinunger, L., 1968, Veroff. Sternw. Sonneberg 7, 385 Google Scholar
Romano, G., 1958, Coelum 26, No. 108 Google Scholar