Query : 1999A&AS..134..453S

1999A&AS..134..453S - Astron. Astrophys., Suppl. Ser., 134, 453-461 (1999/February-1)

Multi-colour optical monitoring of the intra-day variable blazar S5 0716+71.


Abstract (from CDS):

We 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 ≥0.05mag 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 ≥0.1mag 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.

Abstract Copyright:

Journal keyword(s): BL Lac objects: general - BL Lac objects: individual: S5 0716+71 - galaxies: photometry

Nomenclature: Table 1: [SGM99] Star N (Nos 1-3).

CDS comments: T. 1 cross-id.: T-2 = [TSN94] S5 0716+714 Star 2, G-A = [GVR97] S5 0716+714 A, V-N = [VRL98] S5 0716+71 N

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 [GVR97] S5 0716+714 B * 07 21 52.3289285184 +71 18 17.712655380   13.04 12.43   11.79 ~ 10 0
2 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 14.17 14.27   ~ 1211 1
3 [GVR97] S5 0716+714 C * 07 21 54.3632292192 +71 19 20.917412904   14.15 13.55   12.85 ~ 13 0
4 [SGM99] Star 3 * ~ ~           ~ 1 0

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