[en] Context. There exist few variability studies of stars in the region in the Hertzsprung-Russell diagram between the A and B-star pulsational instability strips. With the aid of the high precision continuous measurements of the CoRoT space satellite, low amplitudes are more easily detected, making a study of this neglected region worthwhile. <BR /> Aims: We collected a small sample of B stars observed by CoRoT to determine the origin of the different types of variability observed. <BR /> Methods: We combine literature photometry and spectroscopy to measure the fundamental parameters of the stars in the sample, and compare asteroseismic modelling of the light curves with (differentially rotating) spotted star models. <BR /> Results: We found strong evidence for the existence of spots and differential rotation in HD 174648, and formulated hypotheses for their origin. We show that the distinction between pulsations and rotational modulation is difficult to make solely based on the light curve, especially in slowly rotating stars. The CoRoT space mission was developed and is operated by the French space agency CNES, with participation of ESA's RSSD and Science Programmes, Austria, Belgium, Brazil, Germany, and Spain.Based on observations made with the ESO telescopes at La Silla Observatory under the ESO Large Programme LP182.D-0356.Based on observations made with the Mercator Telescope, operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.Appendix A is available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A>
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Degroote, P.; Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
Acke, B.; Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
Samadi, R.; LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105, Meudon, France
Aerts, C.; Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium ; Department of Astrophysics, IMAPP, University of Nijmegen, PO Box 9010, 6500 GL, Nijmegen, The Netherlands
Kurtz, D. W.; Jeremiah Horrocks Institute of Astrophysics, University of Central Lancashire, Preston, PR1 2HE, UK
Noels-Grötsch, Arlette ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Miglio, Andrea ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Montalban Iglesias, Josefa ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Bloemen, S.; Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium
Baglin, A.; LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105, Meudon, France
Baudin, F.; Institut d'Astrophysique Spatiale, CNRS/Université Paris XI, UMR 8617, 91405, Orsay, France
Catala, C.; LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105, Meudon, France
Michel
Auvergne, M.; LESIA, Observatoire de Paris, CNRS UMR 8109, Université Pierre et Marie Curie, Université Denis Diderot, 5 place J. Janssen, 92105, Meudon, France
Aerts, C., Lamers, H. J. G. L. M., & Molenberghs, G. 2004, A&A, 418, 639
Aerts, C., De Cat, P., Kuschnig, R., et al. 2006, ApJ, 642, L165
Alecian, G., Gebran, M., Auvergne, M., et al. 2009, A&A, 506, 69
Asplund, M., Grevesse, N., Sauval, A. J., Allende Prieto, C., & Blomme, R. 2005, A&A, 431, 693
Aurière, M., Wade, G. A., Silvester, J., et al. 2007, A&A, 475, 1053
Aurière, M., Wade, G. A., Lignières, F., et al. 2010, A&A, 523, A40
Baade, D. 1989a, A&AS, 79, 423
Baade, D. 1989b, A&A, 222, 200
Baglin, A., Michel, E., Auvergne, M., & The COROT Team 2006, in Proc. SOHO 18/GONG 2006/HELAS I, Beyond the spherical Sun, ESA SP, Sheffield, 624
Bohlin, R. C., & Gilliland, R. L. 2004, AJ, 127, 3508
Borucki, W. J., Koch, D., Basri, G., et al. 2010, Science, 327, 977
Briquet, M., De Cat, P., Aerts, C., & Scuflaire, R. 2001, A&A, 380, 177
Briquet, M., Hubrig, S., De Cat, P., et al. 2007, A&A, 466, 269
Briquet, M., Korhonen, H., González, J. F., Hubrig, S., & Hackman, T. 2010, A&A, 511, A71
Cantiello, M., Braithwaite, J., Brandenburg, A., et al. 2010 [arXiv:1010.2498]
Chiar, J. E., & Tielens, A. G. G. M. 2006, ApJ, 637, 774
Clarke, D. 2003, A&A, 407, 1029
Clement, M. J. 1969, ApJ, 156, 1051
Cramer, N. 1984, A&A, 141, 215
Cranmer, S. R., & Owocki, S. P. 1995, ApJ, 440, 308
Cutri, R. M., Skrutskie, M. F., van Dyk, S., et al. 2003, 2MASS All Sky Catalog of point sources, NASA/IPAC Infrared Science Archive
De Cat, P., & Aerts, C. 2002, A&A, 393, 965
De Cat, P., Briquet, M., Daszýnska-Daszkiewicz, J., et al. 2005, A&A, 432, 1013
Degroote, P., Briquet, M., Auvergne, M., et al. 2010, A&A, 519, A38
Droege, T. F., Richmond, M. W., Sallman, M. P., & Creager, R. P. 2006, PASP, 118, 1666
Dziembowski, W. A., & Pamiatnykh, A. A. 1993, MNRAS, 262, 204
Gruber, D., Kuschnig, R., Gruberbauer, M., et al. 2009, Communications in Asteroseismology, 158, 217
Hauck, B., & Mermilliod, M. 1998, A&AS, 129, 431
Høg, E., Fabricius, C., Makarov, V. V., et al. 2000, A&A, 355, L27
Hubrig, S., & Castelli, F. 2001, A&A, 375, 963
Hubrig, S., Briquet, M., De Cat, P., et al. 2009, Astron. Nachr., 330, 317
Hussain, G. A. J. 2002, Astron. Nachr., 323, 349
I̧sik, E., Schüssler, M., & Solanki, S. K. 2007, A&A, 464, 1049
Kurucz, R. L. 1993, VizieR Online Data Catalog, 6039, 0
Lanza, A. F., Rodono, M., & Zappala, R. A. 1993, A&A, 269, 351
Lanza, A. F., Rodonò, M., Pagano, I., Barge, P., & Llebaria, A. 2003, A&A, 403, 1135
Lefever, K., Puls, J., Morel, T., et al. 2010, A&A, 515, A74
Luna, R., Cox, N. L. J., Satorre, M. A., et al. 2008, A&A, 480, 133
Maíz-Apellániz, J. 2007, in The Future of Photometric, Spectrophotometric and Polarimetric Standardization, ed. C. Sterken (San Fransisco: ASP), 364, 227
Mermilliod, J., Mermilliod, M., & Hauck, B. 1997, A&AS, 124, 349
Monet, D. G., Levine, S. E., Canzian, B., et al. 2003, AJ, 125, 984
Moon, T. T., & Dworetsky, M. M. 1985, MNRAS, 217, 305
Niemczura, E., Morel, T., & Aerts, C. 2009, A&A, 506, 213
Ofek, E. O. 2008, PASP, Chicago, 120, 1128
Palacios, A., Gebran, M., Josselin, E., et al. 2010, A&A, 516, A13
Preibisch, T., Weigelt, G., & Zinnecker, H. 2001, in The Formation of Binary Stars, 200, 69
Raskin, G., van Winckel, H., Hensberge, H., et al. 2011, A&A, 526, A69
Reese, D. R., MacGregor, K. B., Jackson, S., Skumanich, A., & Metcalfe, T. S. 2009, A&A, 506, 189
Reiners, A., & Royer, F. 2004a, A&A, 428, 199
Reiners, A., & Royer, F. 2004b, A&A, 415, 325
Reiners, A., & Schmitt, J. H. M. M. 2002a, A&A, 388, 1120
Reiners, A., & Schmitt, J. H. M. M. 2002b, A&A, 384, 155
Reiners, A., & Schmitt, J. H. M. M. 2003, A&A, 412, 813
Royer, F., Zorec, J., & Gómez, A. E. 2007, A&A, 463, 671
Scuflaire, R., Théado, S., Montalbán, J., et al. 2008, Ap&SS, 316, 83
Shorlin, S. L. S.,Wade, G. A., Donati, J.-F., et al. 2002, A&A, 392, 637
Simón-Díaz, S., & Herrero, A. 2007, A&A, 468, 1063
Solano, E., Catala, C., Garrido, R., et al. 2005, AJ, 129, 547
Strassmeier, K. G., & Bopp, B. W. 1992, A&A, 259, 183
Thompson, G. I., Nandy, K., Jamar, C., et al. 1978, Catalogue of stellar ultraviolet fluxes, A compilation of absolute stellar fluxes measured by the Sky Survey Telescope (S2/68) aboard the ESRO satellite TD-1, NASA/STI
Uytterhoeven, K., Briquet, M., Aerts, C., et al. 2005, A&A, 432, 955
Van der Bliek, N. S., Manfroid, J., & Bouchet, P. 1996, A&AS, 119, 547
Von Zeipel, H. 1924, MNRAS, 84, 665
Wade, G. A., Aurière, M., Bagnulo, S., et al. 2006, A&A, 451, 293
Waelkens, C. 1991, A&A, 246, 453
Wolff, S. C. 1983, The A-stars: Problems and perspectives. Monograph series on nonthermal phenomena in stellar atmospheres, NASA/STI
Zorec, J., Frémat, Y., Domiciano de Souza, A., et al. 2011, A&A, 526, A87
