Can I read A spectroscopic multiplicity survey of Galactic Wolf-Rayet stars: II. The northern WNE sequence on EtoBox?

A spectroscopic multiplicity survey of Galactic Wolf-Rayet stars: II. The northern WNE sequence by Dsilva, K.; Shenar, T.; Sana, H.; Marchant, P. is a scholarly article available to read on EtoBox.

What is A spectroscopic multiplicity survey of Galactic Wolf-Rayet stars: II. The northern WNE sequence about?

Most massive stars reside in multiple systems that will interact over the course of their lifetime. Classical Wolf-Rayet (WR) stars represent the final end stages of stellar evolution at the upper-mass end. As part of a homogeneous, magnitude-limited ($V\leq12$) spectroscopic survey of northern Galactic WR stars, this paper aims to establish the observed and intrinsic multiplicity properties of the early-type nitrogen-rich WR population (WNE). We obtained high-resolution spectroscopic time series of the complete magnitude-limited sample of 16 WNE stars observable with the 1.2 m Mercator telescope at La Palma, typically providing a time base of about two to eight years. We measured relative radial velocities (RVs) using cross-correlation and used RV variations to flag binary candidates. Adopting a peak-to-peak RV variability threshold of 50 km/s as a criterion found an observed multiplicity fraction of 0.44$\pm$0.12. Using an updated Monte Carlo method with a Bayesian framework, we calculated the three-dimensional likelihood for the intrinsic binary fraction, the maximum period, and the power-law index for the period distribution for the WNE population. We also re-derived multiplici

Author

Dsilva, K.; Shenar, T.; Sana, H.; Marchant, P.

Published

2022

Language

EN