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GSC 4778-00324, a New Small-Amplitude Multiperiodic δ Scuti Star

  • P. Lampens (a1), P. Van Cauteren (a2), P. Niarchos (a3), K. Gazeas (a3), V. Manimanis (a3), T. Arentoft (a1) (a4), P. Wils (a5), A. Bruch (a6), R. Garrido (a7) and R. Shobbrook (a8)...

Extract

A careful analysis of the light curves of comparison stars to the intermediate amplitude δ Scuti star V1162 Ori observed in 1999/2000 within an international campaign (Arentoft et al., 2001) revealed two new variable stars: GSC 4778-00324, a small-amplitude δ Scuti star, and GSC 4778-00001, an eclipsing variable (see http://www.lunarpages.com/bho for a map of the field). Here, we will concentrate on the first of these.

Since the colour indices (Handler, 2000) put GSC 4778-00324 right in the middle of the δ Scuti instability strip, we decided to monitor its variability (Van Cauteren & Lampens, 2000) taking as much advantage as possible from the international campaign on V1162 Ori and adopting the same comparison stars. The new observations were performed between October 1999 and March 2001, mainly from the Greek and Belgian sites, making use of a standard V filter. We collected and used 2866 data points for GSC 4778-00324 (V = 10.26; b − y = 0.20).

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References

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Arentoft, T. et al. 1998, A&A, 338, 909
Arentoft, T. et al. 2001, A&A, 374, 1056
Handler, G. 2000, IBVS, 4817
Van Cauteren, P., & Lampens, P. 2000, IBVS, 4849

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