A comprehensive variability study of the enigmatic WN8 stars - Final results

SKY SURVEYS (ASTRONOMY); VARIABLE STARS; STELLAR CORES; STELLAR WINDS; STELLAR SPECTROPHOTOMETRY; STATISTICAL ANALYSIS; STELLAR ACTIVITY; DATA PROCESSING; TABLES (DATA)

Abstract :

[en] As a conclusion of our all-sky variability survey of the 'enigmatic' variable WN8 stars, we have carried out coordinated multisite photometric and spectroscopic observations of WN8 stars in 1989 and 1994-1995. We confirm the leading role of the stellar core in restructuring the whole wind. This emerges as a statistical trend: the higher the level of the continuum (i.e., core) light variations, the higher the variability of the P Cygni edges of the optical emission lines. However, the form of the correlation between the light and profile variations is generally different for each individual star. The high level of activity of WN8 stars may be supported/induced by pulsational instability.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Marchenko, S. V.; Montreal, Univ.

Moffat, A. F. J.; Montreal, Univ.

Eversberg, T.; Montreal, Univ.

Morel, Thierry ; Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, H3C 3J7, Canada

Hill, G. M.; Dominion Astrophysical Observatory

Tovmassian, G. H.; Inst. de Astronomia

Seggewiss, W.; Bonn, Universitaets-Sternwarte

Language :

English

Title :

A comprehensive variability study of the enigmatic WN8 stars - Final results

Publication date :

01 March 1998

Journal title :

Monthly Notices of the Royal Astronomical Society

ISSN :

0035-8711

eISSN :

1365-2966

Publisher :

Blackwell Publishing, Oxford, United Kingdom

Volume :

294

Pages :

642

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/1998MNRAS.294..642M

Available on ORBi :

since 19 February 2010

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Bibliography

Abbott D. C., Bieging J. H., Churchwell E., Torres A. V., 1986, ApJ, 303, 239
Antokhin I. I., 1987, Astron. Tsirk., 1489, 5
Antokhin I. I., Cherepashchuk A. M., 1989, Pis'ma Astron. Zh., 15, 701
Antokhin I. I., Bertrand J. F., Lamontagne R., Moffat A. F. J., Matthews J. M., 1995, AJ, 109, 817
Balona L. A., Egan J., Marang F., 1989, MNRAS, 240, 103
Breger M., 1989, Commun. in Asteroseismology, No. 6, Austrian Acad. Sci.
Chalabaev A., Maillard J. P., 1983, A&A, 127, 279
Conti P. S., Massey P., 1989, ApJ, 337, 251
Crawford I. A., Barlow M. J., 1991, A&A, 249, 518
Crowther P. A., Smith L. J., 1997, A&A, in press
Crowther P. A., Hillier D. J., Smith L. J., 1995a, A&A, 293, 172
Crowther P. A., Hillier D. J., Smith L. J., 1995b, A&A, 293, 403
Crowther P. A., Smith L. J., Hillier D. J., Schmutz W., 1995c, A&A, 293, 427
de Jager C., 1980, The Brightest Stars. Reidel, Dordrecht
Eenens P. R. J., Williams P. M., 1994, MNRAS, 269, 1082
Fullerton A. W., Gies D. R., Bolton C. T., 1996, ApJS, 103, 475
Gosset E., Vreux J.-M., Manfroid J., Remy M., Sterken C., 1990, A&AS, 84, 377
Hamann W.-R., Koesterke L., Wessolowski U., 1995, A&A, 299, 151
Kaper L., Henrichs H. F., 1994, in Moffat A. F. J., Owocki S. P., Fullterton A. W., St-Louis N., eds, Instability and Variability of Hot Stellar Winds, Kluwer, Dordrecht, p. 115
Lamontagne R., Moffat A. F. J., 1987, AJ, 94, 1008
Lamontagne R., Moffat A. F. J., Seggewiss R., 1983, ApJ, 269, 596
Langer N., Hamann W.-R., Lennon M., Najarro F., Pauldrach A. W. A., Puls J., 1994, A&A, 290, 819
Leitherer C., Chapman J. M., Koribalski B., 1995, ApJ, 450, 289
Leitherer C., Chapman J. M., Koribalski B., 1997, ApJ, 481, 898
Maeder A., 1985, A&A, 147, 300
Maeder A., 1996, in Vreux J.-M. et al., eds, Wolf-Rayet Stars in the Framework of Stellar Evolution. Université de Liège, p. 39
Malanushenko V. P., 1988, Trudu Tartusskoii Astrofiz. Observatorii, 92, 60
Marchenko S. V., Moffat A. F. J., 1997, ApJ, submitted
Marchenko S. V., Antokhin I. I., Bertrand J. F., Lamontagne R., Moffat A. F. J., Matthews J. M., Piceno A., 1994, AJ, 108, 678
Marchenko S. V., Moffat A. F. J., Lamontagne R., Tovmassian G. H., 1996, ApJ, 461, 386
Massey P., Conti P. S., 1980, ApJ, 242, 638
Matthews J. M., Moffat A. F. J., 1994, A&A, 283, 493
Moffat A. F. J., 1989, ApJ, 347, 373
Moffat A. F. J., 1996, in Vreux J.-M. et al., eds, Wolf-Rayet Stars in the Framework of Stellar Evolution. Université de Liège, p. 199
Moffat A. F. J., Isserstedt J., 1980, A&A, 85, 201
Moffat A. F. J., Shara M. M., 1986, AJ, 92, 952
Moffat A. F. J., Lamontagne R., Seggewiss W., 1982, A&A, 114, 135
Moffat A. F. J. et al., 1997, A&A, in press
Morris P. W., Eenens P. R. J., Hanson M. M., Conti P. S., Blum R. D., 1996, ApJ, 470, 597
Niemela V. S., 1991, in van der Hucht K. A., Hidayat B., eds, Proc. IAU Symp. 143, Wolf-Rayet Stars and Interrelations with Other Massive Stars in Galaxies. Kluwer, Dordrecht, p. 201
Niemela, V. S., Shara M. M., Wallace D. J., Zurek D. R., Moffat A. F. J., 1997, AJ, in press
Nota A., 1995, in van der Hucht K. A., Williams P. M., eds, Proc. IAU Symp. 163, Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution. Kluwer, Dordrecht, p. 78
Rauw G., Gosset E., Manfroid J., Vreux J.-M., Claeskens J.-F., 1996, A&A, 306, 783
Richardson L. L., Brown J. C., Simmons J. F. L., 1996, A&A, 306, 519
Robert C., 1992, Thèse de Doctorat, Université de Montréal
Robert C., Moffat A. F. J., Bastien P., Drissen L., St-Louis N., 1989, ApJ, 347, 1034
Roberts D. H., Lehar J., Dreher J. W., 1987, AJ, 93, 968
Rochowicz K., Niedzielski A., 1995, Acta Astron., 45, 307
Scargle J. D., 1982, ApJ, 263, 835
Schulte-Ladbeck R. E., 1994, in Moffat A. F. J., Owocki S. P., Fullterton A. W., St-Louis N., eds, Instability and Variability of Hot Stellar Winds. Kluwer, Dordrecht, p. 347
Smith L. F., Shara M. M., Moffat A. F. J., 1996, MNRAS, 281, 163
Smith L. J., Lloyd C, Walker E. N., 1985, A&A, 146, 307
St-Louis N., Moffat A. F. J., Drissen L., Bastien P., Robert C, 1988, ApJ, 330, 286
Stothers R. B., Chin C., 1996, ApJ, 468, 842
Tamblyn P., Rieke G. H., Hanson M. N., Close L. M., McCarthy D. W. Jr, Rieke M. J., 1996, ApJ, 456, 206
van der Hucht K. A., 1992, A&AR, 4, 123
van der Hucht K. A., Hidayat B., Admiranto A. G., Supelli K. R., Doom C., 1988, A&A, 199, 217
van Genderen A. M., 1989, A&A, 208, 135
van Genderen A. M., van der Hucht K. A., Steemers W. J. G., 1987, A&A, 185, 131
van Genderen A. M., van der Hucht K. A., Bakker P. R., 1989, A&A, 224, 125
van Genderen A. M. et al., 1991, in van der Hucht K. A., Hidayat B., eds, Proc. IAU Symp. 143, Wolf-Rayet Stars and Interrelations with Other Massive Stars in Galaxies. Kluwer, Dordrecht, p. 129
Vreux J.-M., Andrillat Y., Biémont E., 1990, A&A, 238, 207
Williams P. M., van der Hucht K. A., Thé P. S., 1987, A&A, 182, 91
Williams P. M., Dougherty S. M., Davis R. J., van der Hucht K. A., Bode M., Setia Gunawan D. Y. A., 1997, MNRAS, in press
Willis A. J., 1996, Ap&SS, 237, 145