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A Long-Duration Pre-flare Dip in the Light Curve of V1054 Oph

Published online by Cambridge University Press:  12 April 2016

R. Ventura ,
I. Pagano ,
G. Peres  and
M. Rodonò
R. Ventura
Affiliation:
Osservatorio Astrofisico di Catania, Città Universitaria, I-95125 Catania, Italy
I. Pagano
Affiliation:
Osservatorio Astrofisico di Catania, Città Universitaria, I-95125 Catania, Italy
G. Peres
Affiliation:
Istituto e Osservatorio Astronomico, Palazzo dei Normanni, I-90134 Palermo, Italy
M. Rodonò
Affiliation:
Osservatorio Astrofisico di Catania, Città Universitaria, I-95125 Catania, Italy Istituto di Astronomia, Università degli Studi, viale A. Doria 6, I-95125 Catania, Italy

Extract

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Photometric observations of V1054 Oph (Wolf 630 AB, mv = 9.69) and of the comparison star HD 152678 (mv = 8.1) were carried out in the UBV bands at Catania Astrophysical Observatory on 1994, June 15, using the 91 cm Cassegrain telescope equipped with an improved version of the twin-beam photometer URSULA (De Biase et al. 1988). We have detected a relatively low-intensity flare event preceded by a pre-flare dip of low amplitude and the exceptionally long duration of 36 min. The integration times were 10, 5 and 5 sec in the U, B and V bands, respectively. The variable and the comparison stars were observed simultaneously in the two independent channels of the twin-beam photometer. The sky background was subtracted from the photon count rates of V1054 Oph and its comparison star in each spectral band, and the flux of the variable was normalized to that of the comparison star.

Type
Flares in Late-type Stars: Radio and Optical
Information
International Astronomical Union Colloquium , Volume 151: Flares and Flashes , 1995 , pp. 108 - 109
Copyright
Copyright © Springer-Verlag 1995

References

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