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The ultraviolet and optical spectra of luminous B-type stars in the Small Magellanic Cloud
C. J. Evans, D. J. Lennon, N. R. Walborn +2
We present ultraviolet spectra from the Space Telescope Imaging Spectrograph (STIS) of 12 early B-type stars in the Small Magellanic Cloud (SMC), comprising 9 supergiants and 3 gia…
A Period and a Prediction for the Of?p Spectrum Alternator HD 191612
Nolan R. Walborn, Ian D. Howarth, Gregor Rauw +7
The observational picture of the enigmatic O-type spectrum variable HD191612 has been sharpened substantially. A symmetrical, low-amplitude light curve with a period near 540 d has…
Waiting in the Wings: Reflected X-ray Emission from the Homunculus Nebula
M. F. Corcoran, K. Hamaguchi, T. Gull +14
We report the first detection of X-ray emission associated with the Homunculus Nebula which surrounds the supermassive star Eta Carinae. The emission is characterized by a temperat…
Carina's Defiant Finger: HST Observations of a Photoevaporating Globule in NGC3372
Nathan Smith, Rodolfo Barba, Nolan R. Walborn
We present HST/WFPC2 images of a prominent externally-ionized molecular globule in the Carina Nebula (NGC3372), supplemented with ground-based IR images and visual-wavelength spect…
A CNO Dichotomy among O2 Giant Spectra in the Magellanic Clouds
Nolan R. Walborn, Nidia I. Morrell, Ian D. Howarth +4
From a survey of the 3400 A region in the earliest O-type spectra, we have found that two of the four O2 giants observed in the LMC have the OIV lines there stronger than the NIV,…