depuis le 05 février 2011 :
Visualisation(s): 117 (7 ULg)
Téléchargement(s): 118 (17 ULg)
print
Nicole St-Louis, Dominique Soutière, Simon Péloquin, Antoine de la Chevrotière, Vincent Hénault-Brunet & André-Nicolas Chené

Spectroscopic Monitoring in the Optical Wavelength Region of Nine WC9 Stars

Article Open Access

Abstract

We present a preliminary report of a spectroscopic monitoring campaign in the optical wavelength region of nine WC9 stars that we have carried out at the El Leoncito Observatory in Argentina in May-June 2009. The stars in our sample are not known binaries but have been shown from previous studies to present short-term spectroscopic variability. We confirm that large-scale, line-profile variability is indeed present for several stars in our sample with timescales shorter than ~1 day. A simple visual inspection of the shape of the line-profiles as a function of time does not allow us to conclude if the variations are periodic or not. A more thorough analysis of the data (measurements of the radial velocity, equivalent width, skewness, etc) will be required. Our ultimate goal is to determine the origin of the spectroscopic variability which could lead to new insight into the origin of the dust in presumably single WC9 stars.

Pour citer cet article

Nicole St-Louis, Dominique Soutière, Simon Péloquin, Antoine de la Chevrotière, Vincent Hénault-Brunet & André-Nicolas Chené, «Spectroscopic Monitoring in the Optical Wavelength Region of Nine WC9 Stars», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 80 - Année 2011, 190 - 194 URL : http://popups.ulg.ac.be/0037-9565/index.php?id=2673.

A propos de : Nicole St-Louis

Département de physique, Université de Montréal, Montréal, Canada

A propos de : Dominique Soutière

Département de physique, Université de Montréal, Montréal, Canada

A propos de : Simon Péloquin

Département de physique, Université de Montréal, Montréal, Canada

A propos de : Antoine de la Chevrotière

Département de physique, Université de Montréal, Montréal, Canada

A propos de : Vincent Hénault-Brunet

Institute for Astronomy, University of Edinburgh, Edinburgh, UK

A propos de : André-Nicolas Chené

Gemini Office, Dominion Astrophysical Observatory, Canada