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Two Remarkable Spectroscopic Categories of Young O Stars from the VLT-FLAMES Tarantula Survey
Nolan R. Walborn, Hugues Sana, William D. Taylor +2
The spectral and spatial characteristics of two special categories of O stars found in the VFTS dataset are presented. One of them comprises very rapid rotators, including several…
Light echoes reveal an unexpectedly cool Eta Carinae during its 19th-century Great Eruption
A. Rest, J. L. Prieto, N. R. Walborn +14
Eta Carinae (Eta Car) is one of the most massive binary stars in the Milky Way. It became the second-brightest star in the sky during its mid-19th century "Great Eruption," but the…
High-resolution X-ray spectroscopy of the magnetic Of?p star HD148937
Y. Naze, S. A. Zhekov, N. R. Walborn
High-resolution data of the peculiar magnetic massive star HD148937 were obtained with Chandra-HETGS, and are presented here in combination with a re-analysis of the older XMM-RGS…
First HARPSpol discoveries of magnetic fields in massive stars
E. Alecian, O. Kochukhov, C. Neiner +14
In the framework of the Magnetism in Massive Stars (MiMeS) project, a HARPSpol Large Program at the 3.6m-ESO telescope has recently started to collect high-resolution spectropolari…
The spectral variability and magnetic field characteristics of the Of?p star HD 148937
G. A. Wade, J. Grunhut, G. Graefener +11
We report magnetic and spectroscopic observations and modeling of the Of?p star HD 148937 within the context of the MiMeS LP at the CFHT. Thirty-two high signal-to-noise ratio circ…
Further Results from the Galactic O-Star Spectroscopic Survey: Rapidly Rotating Late ON Giants
Nolan R. Walborn, Jesus Maiz Apellaniz, Alfredo Sota +5
With new data from the Galactic O-Star Spectroscopic Survey, we confirm and expand the ONn category of late-O, nitrogen-enriched (N), rapidly rotating (n) giants. In particular, we…