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New observations of flare stars in the pleiades by the method of stellar tracks

Published online by Cambridge University Press:  23 September 2016

H.S. Chavushian  and
G.H. Broutian
H.S. Chavushian
Affiliation:
Byurakan Astrophysical Observatory Armenian Academy of Sciences, USSR
G.H. Broutian
Affiliation:
Byurakan Astrophysical Observatory Armenian Academy of Sciences, USSR

Abstract

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In 1984-1986 new observations of flare stars in the Pleiades region were carried out by the method of stellar tracks with 40″ Schmidt telescope of the Byurakan observatory. The effective observational time is 100 hours in U-rays (ORWO ZU-21 plates combined with UG-1 filter were used). The stellar tracks have 1-1.5 cm length, the limiting stellar magnitude on the plates is 13m-14m, time resolution is 5S-20s. 17 flares of 13 stars were detected. Six of these stars were detected as flare stars for the first time. According to the Hertzsprung catalogue all these stars are the Pleiades cluster members. The flare amplitudes reach up to 1.5-3.0 magnitudes, the duration vary from 2.5 to 10.5 seconds.

Type
I Flare Stars Optical Observations and Flare Statistics
Information
Symposium - International Astronomical Union , Volume 137: Flare Stars in Star Clusters, Association and Solar Vicinity , 1990 , pp. 63 - 66
Copyright
Copyright © Kluwer 1990 

References

1. Chavushian, H.S., (1986) ‘Observations of flare stars in the Pleiades by the stellar tracks method’, in Mirzoyan, L.V. (ed.) Flare stars and related objects, Academy of Sciences of Armenia, Yerevan, pp. 125–129.Google Scholar
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3. Hertzsprung, E. et al (1947) ‘Catalogue de 3259 etoiles dans les Pleiades’, Ann. Leiden Obs., 19, No. IA.Google Scholar
4. Johnson, H.L. and Mitchell, R.I. (1958) ‘The color-magnitude diagram of the Pleiades cluster. II’, Astrophys. J. 128, 31–40.Google Scholar