Optical Photometry of Quasar 0957+561A, B

Oscoz, A.; Serra-Ricart, M.; Goicoechea, Luis Julian; Buitrago, Jesus; Mediavilla, Evencio
Referencia bibliográfica

Astrophysical Journal Letters v.470, p.L19

Fecha de publicación:
10
1996
Número de autores
5
Número de autores del IAC
4
Número de citas
13
Número de citas referidas
13
Descripción
Observations of the gravitational lens system 0957+561A, B in the R band are presented in this Letter. The observations, taken with the 82 cm IAC-80 telescope, at Teide Observatory, Spain, were made from the beginning of 1996 February to June, as part of an on-going lens monitoring program to obtain the time delay between the two components of the system. By comparing our data with those previously published by Kundic et al., we infer that a large delay (>500 days) is inconsistent with both data sets.