5 results on '"Van Helshoecht V."'
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2. Towards ensemble asteroseismology of the young open clusters χ Persei and NGC 6910
- Author
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Saesen, S. Pigulski, A. Carrier, F. Michalska, G. Aerts, C. De Ridder, J. Briquet, M. Handler, G. Kołaczkowski, Z. Acke, B. Bauwens, E. Beck Blom, Y. Blommaert, J. Broeders, E. Cherix, M. Davignon, G. Debosscher, J. Degroote, P. Decin, L. Dehaes, S. De Meester, W. Deroo, P. Desmet, M. Drummond, R. Eggen, J.R. Fu, J. Gazeas, K. Gelven, G.A. Gielen, C. Huygen, R. Jiang, X. Kalomeni, B. Kim, S.-L. Kim, D.H. Kopacki, G. Kwon, J.-H. Ladjal, D. Lee, C.-U. Lee, Y.-J. Lefever, K. Leitner, A. Lenz, P. Liakos, A. Lorenz, D. Narwid, A. Niarchos, P. Østensen, R. Poretti, E. Prins, S. Provencal, J. Puga Antolin, E. Puschnig, J. Raskin, G. Reed, M.D. Reyniers, M. Schmidt, E. Schmitzberger, L. Spano, M. Steininger, B. SteeLicki, M. Uytterhoeven, K. Vanautgaerden, J. Vandenbussche, B. Van Helshoecht, V. Vanhollebeke, E. Van Winckel, H. Verhoelst, T. Vućković, M. Waelkens, C. Wolf, G. Yakut, K. Zhang, C. Zima, W.
- Abstract
As a result of the variability survey in χ Persei and NGC 6910, the number of β Cep stars that are members of these two open clusters is increased to twenty stars, nine in NGC 6910 and eleven in χ Persei. We compare pulsational properties, in particular the frequency spectra, of β Cep stars in both clusters and explain the differences in terms of the global parameters of the clusters. We also indicate that the more complicated pattern of the variability among B-type stars in χ Persei is very likely caused by higher rotational velocities of stars in this cluster. We conclude that the sample of pulsating stars in the two open clusters constitutes a very good starting point for the ensemble asteroseismology of β Cep-type stars and maybe also for other B-type pulsators. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- Published
- 2010
3. Photometric multi-site campaign on the open cluster NGC 884 I. Detection of the variable stars
- Author
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Saesen, S. Carrier, F. Pigulski, A. Aerts, C. Handler, G. Narwid, A. Fu, J. N. Zhang, C. Jiang, X. J. and Vanautgaerden, J. Kopacki, G. Steslicki, M. Acke, B. and Poretti, E. Uytterhoeven, K. Gielen, C. Ostensen, R. De Meester, W. Reed, M. D. Kolaczkowski, Z. Michalska, G. and Schmidt, E. Yakut, K. Leitner, A. Kalomeni, B. Cherix, M. Spano, M. Prins, S. Van Helshoecht, V. Zima, W. and Huygen, R. Vandenbussche, B. Lenz, P. Ladjal, D. and Antolin, E. Puga Verhoelst, T. De Ridder, J. Niarchos, P. and Liakos, A. Lorenz, D. Dehaes, S. Reyniers, M. and Davignon, G. Kim, S. -L. Kim, D. H. Lee, Y. -J. Lee, C. -U. Kwon, J. -H. Broeders, E. Van Winckel, H. and Vanhollebeke, E. Waelkens, C. Raskin, G. Blom, Y. Eggen, J. R. Degroote, P. Beck, P. Puschnig, J. Schmitzberger, L. Gelven, G. A. Steininger, B. Blommaert, J. Drummond, R. Briquet, M. Debosscher, J.
- Subjects
Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
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.
- Published
- 2010
4. Asteroseismology of massive stars in the young open cluster NGC 884: a status report
- Author
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Saesen, S., Carrier, F., Pigulski, A., Aerts, C., Handler, G., Narwid, A., Fu, J. N., Zhang, C., Jiang, X. J., Kopacki, G., Vanautgaerden, J., Steślicki, M., Acke, B., Poretti, E., Uytterhoeven, K., De Meester, W., Reed, M. D., Kołaczkowski, Z., Michalska, G., Schmidt, E., xd6stensen, R., Gielen, C., Yakut, K., Leitner, A., Kalomeni, B., Prins, S., van Helshoecht, V., Zima, W., Huygen, R., Vandenbussche, B., Lenz, P., Ladjal, E., Puga Antolxedn, E., Verhoelst, T., De Ridder, J., Niarchos, P., Liakos, A., Lorenz, Saesen, Carrier, Pigulski, Aerts, Handler, Narwid, J. N., Zhang, Jiang, X. J., Kopacki, Vanautgaerden, Steślicki, Acke, Poretti, Uytterhoeven, De Meester, Reed, M. D., Kołaczkowski, Michalska, Schmidt, xd6stensen, Gielen, Yakut, Leitner, Kalomeni, Prins, van Helshoecht, Zima, Huygen, Vandenbussche, Lenz, Ladjal, Puga Antolxedn, Verhoelst, De Ridder, Niarchos, and Liakos
- Published
- 2009
5. Photometric multi-site campaign on massive B stars in the open cluster chi Persei (NGC 884)
- Author
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Saesen, S. Pigulski, A. Carrier, F. De Ridder, J. Aerts, C. Handler, G. Narwid, A. Fu, J. N. Zhang, C. Jiang, X. J. Kopacki, G. Vanautgaerden, J. Steslicki, M. Acke, B. Poretti, E. Uytterhoeven, K. De Meester, W. Reed, M. D. Kolaczkowski, Z. Michalska, G. Schmidt, E. Ostensen, R. Gielen, C. Yakut, K. Leitner, A. Kalomeni, B. and Prins, S. Van Helshoecht, V. Zima, W. Huygen, R. and Vandenbussche, B. Lenz, P. Ladjal, D. Antolin, E. Puga and Verhoelst, T. Niarchos, P. Liakos, A. Lorenz, D. Dehaes, S. Reyniers, M. Davignon, G. Kim, S-L Kim, D. H. and Lee, Y-J Lee, C-U Kwon, J-H Broeders, E. Van Winckel, H. and Vanhollebeke, E. Raskin, G. Blom, Y. Eggen, J. R. and Beck, P. Puschnig, J. Schmitt, L. Gelven, G. A. and Steiniger, B. Drummond, R.
- Abstract
In 2005 a photometric observation campaign started on the open cluster chi Persei, involving 13 telescopes spread over the whole northern hemisphere. After two years we gathered almost 1200 hours of data. We present here preliminary results on the variability search, especially from the 60-cm telescope in Bialkow (Poland), which show seven confirmed beta Cephei stars, four candidate B-type pulsators and other interesting variable stars.
- Published
- 2008
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