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

Published online by Cambridge University Press:  12 April 2016

P. Lampens ,
P. Van Cauteren ,
P. Niarchos ,
K. Gazeas ,
V. Manimanis ,
T. Arentoft ,
P. Wils ,
A. Bruch ,
R. Garrido  and
R. Shobbrook
P. Lampens
Affiliation:
Koninklijke Sterrenwacht van België, Ringlaan 3, Brussels, Belgium
P. Van Cauteren
Affiliation:
Beersel Hills Observatory and VVS, Belgium
P. Niarchos
Affiliation:
Department of Astrophysics, Astronomy and Mechanics, University of Athens, GR-15784 Zografos, Athens, Greece
K. Gazeas
Affiliation:
Department of Astrophysics, Astronomy and Mechanics, University of Athens, GR-15784 Zografos, Athens, Greece
V. Manimanis
Affiliation:
Department of Astrophysics, Astronomy and Mechanics, University of Athens, GR-15784 Zografos, Athens, Greece
T. Arentoft
Affiliation:
Koninklijke Sterrenwacht van België, Ringlaan 3, Brussels, Belgium Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
P. Wils
Affiliation:
Vereniging Voor Sterrenkunde (VVS), Belgium
A. Bruch
Affiliation:
Laboratório Nacional de Astrofísica, C.P. 21, 37500-000 Itajubá, Brazil
R. Garrido
Affiliation:
Instituto de Astrofísica de Andalucía, CSIC, Ap. 3004, Granada, Spain
R. Shobbrook
Affiliation:
Research School of Astronomy and Astrophysics, Australian National University, Weston Creek PO, ACT 2611, Australia

Extract

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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).

Type
Part 2.4. Delta Scuti Stars
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 344 - 345
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

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