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The Luminous Blue Variables: Astrophysical Geysers
Some of the most luminous stars have sporadic, violent mass-loss events whose cuases are not understood. These evolved hot stars are called Luminous Blue Variables (LBV's), and their instability mayExpand
Eta carinae and its environment
▪ Abstract Eta Carinae (Eta) is one of the most remarkable of all well-studied stars and perhaps the most poorly understood. Observations with the Hubble Space Telescope and other modern instrumentsExpand
On the Nature of the Central Source in η Carinae
Long-slit spectroscopic observations of η Carinae and its Homunculus have recently been obtained using STIS on the Hubble Space Telescope (HST). We have extracted the spectrum of the central sourceExpand
Studies of luminous stars in nearby galaxies. III. Comments on the evolution of the most massive stars in the Milky Way and the large magellanic cloud
An empirical comparison of the observed H-R diagrams for the supergiants in our region of the Galaxy and the Large Magellanic Cloud reveals comparable distributions of spectral types and luminositiesExpand
The Asymmetric Nebula Surrounding the Extreme Red Supergiant Vy Canis Majoris
We present HST/WFPC2 images plus ground-based infrared images and photometry of the very luminous OH/IR star VY Canis Majoris. Our WFPC2 data show a complex distribution of knots and filamentary arcsExpand
Neutron-star accretion in a stellar wind - Model for a pulsed X-ray source.
Description of a relatively simple stellar-wind-driven accretion model that appears to satisfactorily account for many of the observed features of the pulsing X-ray sources Cen X-3 and Her X-1. AExpand
Recent Developments Concerning the Crab Nebula
On presente les informations essentielles relatives a la nebuleuse du Crabe. On passe en revue les determinations spectroscopiques de la masse et de la composition chimique de la nebuleuse. OnExpand
Latitude-dependent Effects in the Stellar Wind of η Carinae
The Homunculus reflection nebula around η Carinae provides a rare opportunity to observe the spectrum of a star from more than one direction. In the case of η Car, the nebula's geometry is known wellExpand
The Shape and Orientation of the Homunculus Nebula
Doppler velocities give information about the three-dimensional shape and orientation of the bipolar ejecta of η Car. We report slit spectroscopy obtained using the Space Telescope ImagingExpand
High-Excitation Emission Lines Near Eta Carinae, and Its Likely Companion Star
In order to study the distribution of gas and ionizing radiation around η Car and their implications for its likely companion star, we have examined high-excitation emission lines of [Ne III], [FeExpand