High-speed infrared photometry of rapidly oscillating AP (roAp) stars - 10 Aquilae

Belmonte, J. A.; Martinez Roger, C.; Roca-Cortés, T.
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Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 2, Aug. 1991, p. 541-546.

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High-speed photometric observations of the recently discovered roAp star 10 Aql were performed in the J(1.22-micrometer) filter. A total of 47.2 hours of data were obtained during seven consecutive nights in July 1990, using a standard infrared photometer attached to the Cassegrain focus of the 1.54 m Carlos Sanchez telescope at the Observatorio del Teide (Tenerife, Spain). As a first approach, the harmonic analysis of the data shows a noise level of about 0.8 mmag with the presence of marginal signal (Delta-J is approximately equal to 1 mmag) in the visible (B band) photometric frequencies already reported by Heller and Cramer (1990). The possibility of interpreting these events as actual stellar signal is discussed.