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Full-Text Articles in Physical Sciences and Mathematics
Discovery Of X-Ray Pulsations From A Massive Star., Lidia Oskinova, Yael Nazé, Helge Todt, David Huenemoerder, Richard Ignace, Swetlana Hubrig, Wolf-Rainer Hamann
Discovery Of X-Ray Pulsations From A Massive Star., Lidia Oskinova, Yael Nazé, Helge Todt, David Huenemoerder, Richard Ignace, Swetlana Hubrig, Wolf-Rainer Hamann
ETSU Faculty Works
X-ray emission from stars much more massive than the Sun was discovered only 35 years ago. Such stars drive fast stellar winds where shocks can develop, and it is commonly assumed that the X-rays emerge from the shock-heated plasma. Many massive stars additionally pulsate. However, hitherto it was neither theoretically predicted nor observed that these pulsations would affect their X-ray emission. All X-ray pulsars known so far are associated with degenerate objects, either neutron stars or white dwarfs. Here we report the discovery of pulsating X-rays from a non-degenerate object, the massive B-type star ξ1 CMa. This star is a …
Discovery Of The First Τ Sco Analogues: Hd 66665 And Hd 63425., V. Petit, D. Massa, W. Marcolinino, G. Wade, Richard Ignace
Discovery Of The First Τ Sco Analogues: Hd 66665 And Hd 63425., V. Petit, D. Massa, W. Marcolinino, G. Wade, Richard Ignace
ETSU Faculty Works
The B0.2 V magnetic star τ Sco stands out from the larger population of massive OB stars due to its high X-ray activity, peculiar wind diagnostics and highly complex magnetic field. This Letter presents the discovery of the first two τ Sco analogues – HD 66665 and HD 63425, identified by the striking similarity of their ultraviolet (UV) spectra to that of τ Sco. ESPaDOnS spectropolarimetric observations were secured by the Magnetism in Massive Stars CFHT Large Program, in order to characterize the stellar and magnetic properties of these stars. cmfgen modelling of optical ESPaDOnS spectra and archived IUE UV …