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Astron. Astrophys. 354, L13-L16 (2000)

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2. Observations

Our observational program on hot subdwarf stars, which constitutes the bulk of the Thesis of Galleti (1998), was started on November 8, 1997 at the Loiano Observatory with the G.D. Cassini 1.52 m telescope. A new version (Piccioni et al. 1999) of the two-heads fast photoelectric photometer - originally described by Piccioni et al. (1979) - has been used in the Cassegrain focus. This instrument allows simultaneous measurements of the target and a comparison star with the photon counting technique in one of the three available UBV colours or without filter. The log of observations is reported in Table 1. The measurements were performed with a sampling time of 1 s and without any filter. The sky background was measured with both photometric heads at the beginning and at the end of each run.


Table 1. Log of observations

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© European Southern Observatory (ESO) 2000

Online publication: January 31, 2000