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Multimode Detections from Surveys

Published online by Cambridge University Press:  12 April 2016

C. Aerts
C. Aerts*
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium

Abstract

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In this study we present an overview of the search for multiple frequencies in variable Be stars from surveys. We review the recent ground-based photometric surveys and conclude from them that multiperiodicity is not detected. The photometric experiment on board Hipparcos, on the other hand, does allow us to derive multiple periods for a few Be stars. We present the results of our frequency searches in the Hipparcos data for 50 λ Eri stars.

Further we review the recent spectroscopic campaigns dedicated to some stars. It seems that all of these campaigns point to multiperiodic phenomena, although for most of them the time base is insufficient to derive the periods with high accuracy. Moreover, the spectroscopic periods are often not the same as those found from the photometry. This clearly demonstrates the necessity of long-term simultaneous photometric and spectroscopic campaigns. We present the preliminary results of such a campaign for the λ Eri star HD 105382.

We close with reflections on the cause of the variability observed in the λ Eri stars and on the best viewpoint for further research in this area.

Type
3. Periodic Variations
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 192 - 204
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Aerts, C., de Cat, P., Cuypers, J., et al. 1997, A&A, 329, 137 Google Scholar
Aerts, C., de Cat, P., Peeters, E., et al. 1999, A&A, 343, 872 Google Scholar
Baade, D., 1982, A&A, 105, 65 Google Scholar
Baade, D., 1984, A&A, 135, 101 Google Scholar
Baade, D., Balona, L.A., 1994, In Pulsation, Rotation and Mass-Loss in Early-Type Stars, Balona, L.A., Henrichs, H.F. & LeContel, J.M., Kluwer Academie Publishers, 311 Google Scholar
Balona, L.A., 1990, In Confrontation between Stellar Pulsation and Evolution Cacciari, C. & Clementini, G., 245 Google Scholar
Balona, L.A., 1995, MNRAS, 277, 1547 Google Scholar
Balona, L.A., Aerts, C., Stefl, S., 1999, MNRAS, 305, 519 Google Scholar
Balona, L.A., Cuypers, J., Marang, F., 1992, A&AS, 92, 533 Google Scholar
Bossi, M., Guerrero, G., Zanin, F., 1993, A&A, 269, 343 Google Scholar
Cuypers, J., Balona, L.A., Marang, F., A&AS, 81, 151 Google Scholar
Dachs, J., Eichendorf, W., Schleicher, H., et al., 1981, A&AS, 43, 427 Google Scholar
Dachs, J., Lemmer, U., In Rapid Variability of OB-Stars: Nature and diagnostic value, Baade, D., ESO Conf. Proc 36, 103 Google Scholar
Eyer, L., Grenon, M., 1997, In Hipparcos-Venice ‘97, ESA SP-402, 467 Google Scholar
Floquet, M., Hubert, A.M., Hubert, H., et al., 1996, A&A, 310, 849 Google Scholar
Floquet, M., Hubert, A.M., Janot-Pacheco, E., et al., 1992, A&A, 264, 177 Google Scholar
Guerrero, G., Bossi, M., Scardia, M., 1992, A&A, 260, 311 Google Scholar
Hiltner, W.A., Garrison, R.F., Schild, R.E., 1969, ApJ, 157, 313 Google Scholar
Hubert, A.M., Floquet, M., 1998, A&A, 335, 565 Google Scholar
Hubert, A.M., Floquet, M., Hao, J.X., et al., 1997, A&A, 324, 929 Google Scholar
Kambe, E., Hirata, R., Ando, H., et al., 1997, ApJ, 481, 406 Google Scholar
Kambe, E., Ando, H., Hirata, R., et al., 1993, PASP, 105, 1222 CrossRefGoogle Scholar
Matthews, J.M., Harmanec, P., Walker, G.A.H., et al., 1991, MNRAS, 248, 787 Google Scholar
Pavlovski, K., Harmanec, P., Bozic, H., et al., 1997, A&AS, 125, 75 Google Scholar
Pavlovski, K., Ruzic, Z., 1988, A&AS, 76, 137 Google Scholar
Pavlovski, K., Ruzic, Z., 1990, A&A, 236, 393 Google Scholar
Peters, G., Penrod, G.D., 1988, In A Decade of UV Astronomy with the IUE satellite, ESA-SP-281, Vol.2, 117 Google Scholar
Rivinius, Th., 1998, PhD Thesis, University of Heidelberg, Germany Google Scholar
Rivinius, Th., Baade, D., Stefl, S., et al., 1998, A&A, 336, 177 Google Scholar
Sareyan, J.P., Alvarez, M., Chauville, J., et al, 1988, A&A, 193, 159 Google Scholar
Sareyan, J.P., Gonzalez-Bedolla, S., Guerrero, G., 1988, A&A, 332, 155 Google Scholar
Stefl, S., Baade, D., Harmanec, P., Balona, L.A., 1995, A&A, 294, 135 Google Scholar
Stefl, S., Aerts, C., Balona, L.A., 1999, MNRAS, 305, 505 Google Scholar
Sterken, C., Vogt, N., Mennickent, R.E., 1996, A&A, 311, 579 Google Scholar
Waelkens, C. 1991, A&A, 246, 453 Google Scholar
Waelkens, C., Aerts, C., Kestens, E., et al., 1998, A&A, 330, 215 Google Scholar