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Astron. Astrophys. 354, 589-594 (2000)

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Period and amplitude changes in the [FORMULA] Scuti star V 1162 Orionis *

T. Arentoft and C. Sterken

University of Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium (tarentof@vub.ac.be; csterken@vub.ac.be)

Received 14 September 1999 / Accepted 23 November 1999


We present yb time-series CCD photometry of the high-amplitude [FORMULA] Scuti star V 1162 Ori. A period break and a significant decrease in amplitude (50 percent) has been reported for this star by Hintz et al. (1998). New observations carried out over two observing seasons suggest that the period found by Hintz et al. (1998) was no longer valid in early 1998, and that the period again changed during March or April 1998. The latter period change was accompanied by an increase in amplitude of the order of 10 percent.

The existing data can be explained by a frequently changing period or by a possible cyclic variation in the [FORMULA] diagram indicating sudden changes, a binary system or the presence of two very closely-spaced pulsation frequencies.

Key words: methods: data analysis – techniques: photometric – stars: variables: ffi Sct – stars: individual: V 1162 Ori

* Based on observations obtained at the European Southern Observatory at La Silla, Chile (applications ESO 62H-0110, 64H-0065 and 64L-0182)

Send offprint requests to: T. Arentoft

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© European Southern Observatory (ESO) 2000

Online publication: February 9, 2000