Observations of Broad Emission Lines in Wolf-Rayet Winds with Long-Baseline Interferometry

Details Observations of Broad Emission Lines in Wolf-Rayet Winds with Long-Baseline Interferometry Observations of Broad Emission Lines in Wolf-Rayet Winds with Long-Baseline Interferometry

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5716h&link_type=abstract

American Astronomical Society, AAS Meeting #211, #57.16; Bulletin of the American Astronomical Society, Vol. 39, p.832

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results of milli-arcsecond (mas) observations of six Wolf-Rayet stars taken in 2003 with the Palomar Testbed Interferometer (PTI) and the Keck Interferometer (KI) in the K band (2.0-2.4 microns). PTI has a nominal fringe spacing of 4 mas in the K band, whereas KI has a fringe spacing of 5.2 mas. The purpose of these observations was to exploit this high resolution to help determine binarity, which is unknown for many Wolf-Rayet in systems. In addition, we have resolved He emission lines in narrowband ( 0.1 micron channel) measurements taken with both interferometers. Reduction of the observations yield visibilities and derived angular sizes in 4 or 5 spectral channels across the K band, revealing stratification of the stellar atmospheres. We have also recorded evolution in some resolved spectral features, indicating structure in the winds; however, follow-up interferometric observations are needed to better quantify this phenomena. We present the observations, some of the narrow-band data and initial conclusions based on our findings. We acknowledge support from the Donald Menzel Memorial Fund and the Rocky Mountain NASA Spacegrant Consortium at the University of Denver.

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