Photometric multi-site campaign on the open cluster NGC 884 I. Detection of the variable stars
| Autor: | L. Schmitzberger, P. G. Beck, Jonas Debosscher, R. H. Østensen, S. Dehaes, K. Uytterhoeven, E. Schmidt, Maarten Reyniers, J. Puschnig, Michael D. Reed, S. L. Kim, P. G. Niarchos, Fabien Carrier, Belinda Kalomeni, C.-U. Lee, Conny Aerts, E. Poretti, B. Steininger, J. Vanautgaerden, E. Broeders, V. Van Helshoecht, M. Cherix, W. De Meester, Jian-Ning Fu, R. Drummond, G. A. Gelven, Pieter Degroote, S. Prins, C. Waelkens, Patrick Lenz, B. Vandenbussche, Sophie Saesen, Z. Kołaczkowski, Bram Acke, Yongseok Lee, G. Kopacki, J. R. Eggen, D. Ladjal, W. Zima, H. Van Winckel, Andrzej Pigulski, J. De Ridder, J. A. D. L. Blommaert, J.-H. Kwon, Rik Huygen, M. Stȩślicki, Y. Blom, C. Zhang, Gerald Handler, Clio Gielen, G. Michalska, T. Verhoelst, A. Leitner, M. Spano, Alexios Liakos, A. Narwid, D. Lorenz, D. H. Kim, Xiao-Jun Jiang, Maryline Briquet, E. Puga Antolín, Kadri Yakut, G. Davignon, Gert Raskin, E. Vanhollebeke |
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| Přispěvatelé: | Izmir Isntitute of Technology, Ege Üniversitesi |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
oscillations [stars]
open clusters and associations: individual: NGC 884 FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences individual: NGC 884 [open clusters and associations] Spectral line Photometry (optics) photometric [techniques] techniques: photometric eclipsing [binaries] 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Stellar structure 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics binaries: eclipsing Astronomy and Astrophysics Light curve stars: variables: general Stars Amplitude Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science variables: general [stars] stars: oscillations Astrophysics::Earth and Planetary Astrophysics Variable star Open cluster |
| Zdroj: | Astronomy and Astrophysic |
| Popis: | Van 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/0000-0002-1368-3109 Context. 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. Austrian Science Fund (FWF)Austrian Science Fund (FWF) [P 21830] Funding Source: researchfish |
| Databáze: | OpenAIRE |
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