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dc.contributor.authorSaesen, S.
dc.contributor.authorCarrier, F.
dc.contributor.authorPigulski, A.
dc.contributor.authorAerts, C.
dc.contributor.authorHandler, G.
dc.contributor.authorNarwid, A.
dc.contributor.authorDebosscher, J.
dc.descriptionVan Winckel, Hans/0000-0001-5158-9327; Liakos, Alexios/0000-0002-0490-1469; Yakut, Kadri/0000-0003-2380-9008; Lee, Chung-Uk/0000-0003-0043-3925; Verhoelst, Tijl/0000-0003-0163-9984; Reed, Michael/0000-0002-2936-4807; Poretti, Ennio/0000-0003-1200-0473; Steslicki, Marek/0000-0002-9647-3018; Aerts, Conny/0000-0003-1822-7126; Michalska, Gabriela/0000-0002-4981-4000; Gielen, Clio/0000-0001-5522-4341; Raskin, Gert/0000-0002-1323-9788; Beck, Paul G./0000-0003-4745-2242; Vandenbussche, Bart/0000-0002-1368-3109en_US
dc.description.abstractContext. Recent progress in the seismic interpretation of field beta Cep stars has resulted in improvements of the physics in the stellar structure and evolution models of massive stars. Further asteroseismic constraints can be obtained from studying ensembles of stars in a young open cluster, which all have similar age, distance and chemical composition. Aims. To improve our comprehension of the beta Cep stars, we studied the young open cluster NGC 884 to discover new B- type pulsators, besides the two known beta Cep stars, and other variable stars. Methods. An extensive multi-site campaign was set up to gather accurate CCD photometry time series in four filters (U, B, V, I) of a field of NGC 884. Fifteen different instruments collected almost 77 500 CCD images in 1286 h. The images were calibrated and reduced to transform the CCD frames into interpretable differential light curves. Various variability indicators and frequency analyses were applied to detect variable stars in the field. Absolute photometry was taken to deduce some general cluster and stellar properties. Results. We achieved an accuracy for the brightest stars of 5.7 mmag in V, 6.9 mmag in B, 5.0 mmag in I and 5.3 mmag in U. The noise level in the amplitude spectra is 50 mu mag in the V band. Our campaign confirms the previously known pulsators, and we report more than one hundred new multi- and mono- periodic B-, A- and F-type stars. Their interpretation in terms of classical instability domains is not straightforward, pointing to imperfections in theoretical instability computations. In addition, we have discovered six new eclipsing binaries and four candidates as well as other irregular variable stars in the observed field.en_US
dc.description.sponsorshipAustrian Science Fund (FWF)Austrian Science Fund (FWF) [P 21830] Funding Source: researchfishen_US
dc.publisherEDP SCIENCES S Aen_US
dc.subjectopen clusters and associations: individual: NGC 884en_US
dc.subjecttechniques: photometricen_US
dc.subjectstars: variables: generalen_US
dc.subjectstars: oscillationsen_US
dc.subjectbinaries: eclipsingen_US
dc.titlePhotometric multi-site campaign on the open cluster NGC 884 I. Detection of the variable starsen_US
dc.relation.journalAstronomy & Astrophysicsen_US
dc.contributor.departmentIzmir Isntitute of Technologyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US

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