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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