Winds of Massive Stars: High Resolution X-ray Spectra of Stars in NGC 3603
arXiv:1805.06973 · doi:10.3847/1538-3881/aaf380
Abstract
The cluster NGC 3603 hosts some of the most massive stars in the Galaxy. With a modest 50 ks exposure with the Chandra High Energy Grating Spectrometer, we have resolved emission lines in spectra of several of the brightest cluster members which are of WNh and O spectral types. This observation provides our first definitive high-resolution spectra of such stars in this nearby starburst region. The stars studied have broadened X-ray emission lines, some with blue-shifted centroids, and are characteristic of massive stellar winds with terminal velocities around 2000--3000 km/s. X-ray luminosities and plasma temperatures are very high for both the WNh and O stars studied. We conclude that their X-rays are likely the result of colliding winds.
Accepted for publication in the Astronomical Journal
References in corpus (7)
- The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 Msun stellar mass limit
- The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 additional O-type systems
- The secrets of the nearest starburst cluster: II. The present-day mass function in NGC 3603
- The Massive Star-forming Regions Omnibus X-ray Catalog
- The very massive binary NGC3603-A1
- The Massive Star Content of NGC 3603
- SOAR optical and near-infrared spectroscopic survey of newly discovered massive stars in the periphery of Galactic Massive star clusters I - NGC3603