Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/3224
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dc.contributor.authorSagar, R-
dc.contributor.authorGopal-Krishna-
dc.contributor.authorMohan, V-
dc.contributor.authorPandey, A. K-
dc.contributor.authorBhatt, B. C-
dc.contributor.authorWagner, S. J-
dc.date.accessioned2008-08-21T09:54:00Z-
dc.date.available2008-08-21T09:54:00Z-
dc.date.issued1999-02-
dc.identifier.citationAstronomy and Astrophysics Supplement, Vol. 134, No. 3, pp. 453 - 461en
dc.identifier.issn0365 - 0138-
dc.identifier.urihttp://hdl.handle.net/2248/3224-
dc.description.abstractWe report multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 with a dense temporal coverage over a total duration of 4 weeks in February/March 1994. Four filters (BV Johnson and RI Cousins) were used on a majority of the nights. The light curves of the blazar were derived relative to two comparison stars present on the CCD frames. Intensity variations of >= 0.05 mag from night-to-night were observed in half the cases and a good correlation between the light curves in the different passbands was noticed (as also for the observed intra-night variations). There seems to be no correlation between flux and optical spectral index of the blazar. In all, three prominent events of intra-night variability were detected, each with a rate of >= 0.1 mag per hour, lasting for at least 3 hours. Each of these flaring segments of the blazar light curves can be well fitted with an exponential intensity profile whose rate of variation is essentially the same for all the passbands. No clear event of ultra-rapid fluctuations of the blazar on time scale <= 1 hour was detected in these multi-colour data. Present observations have been carried out during a low brightness level of the blazar and they have no large amplitude variable events. Based on observations obtained at the U.P. State Observatory, Naini Tal, India and V.B. Observatory, Kavalur, India.en
dc.format.extent387740 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherThe European Southern Observatoryen
dc.relation.urihttp://dx.doi.org/10.1051/aas:1999149en
dc.subjectBL Lac Objects: Generalen
dc.subjectBL Lac Objects: Individual: S5 0716+71en
dc.subjectGalaxies: Photometryen
dc.titleMulti-colour optical monitoring of the intra-day variable blazar S5 0716+71en
dc.typeArticleen
Appears in Collections:IIAP Publications

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