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The 5.52 Year Cycle of Eta Carinae: BeppoSAX Detection of Variable Hard (> 10 keV) X-Ray Emission
I have discovered spectroscopic variations correlated with the photometric near-infrared (NIR) light curve in η Carinae. The fading of the high-excitation lines is coincident with the peaks in theExpand
The periodicity of the η Carinae events
Extensive spectral observations of η Carinae over the last cycle, and particularly around the 2003.5 low-excitation event, have been obtained. The variability of both narrow and broad lines, whenExpand
ON THE NATURE OF THE PROTOTYPE LUMINOUS BLUE VARIABLE AG CARINAE. I. FUNDAMENTAL PARAMETERS DURING VISUAL MINIMUM PHASES AND CHANGES IN THE BOLOMETRIC LUMINOSITY DURING THE S-Dor CYCLE*
We present a detailed spectroscopic analysis of the luminous blue variable AG Carinae during the last two visual minimum phases of its S-Dor cycle (1985-1990 and 2000-2003). The analysis reveals anExpand
Eta Carinae: a long period binary?
Abstract We present new observations of η Carinae, strongly suggesting that it is a binary system. High dispersion measurements of the broad Paγ emission line show periodic radial velocity variationsExpand
The Stellar Content of Obscured Galactic Giant H ii Regions. II. W42
We present near-infrared J, H, and K images and K-band spectroscopy in the giant H II region W42. A massive star cluster is revealed; the color-color plot and K-band spectroscopic emission featuresExpand
Recurrent X-Ray Emission Variations of η Carinae and the Binary Hypothesis
Recent studies by Damineli and coworkers suggest that the supermassive star η Carinae may have a massive stellar companion, although the dense ejecta surrounding the star make this claim hard to testExpand
A multispectral view of the periodic events in η Carinae
A full description of the 5.5-yr low excitation events in η Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two components. The first,Expand
BONA FIDE, STRONG-VARIABLE GALACTIC LUMINOUS BLUE VARIABLE STARS ARE FAST ROTATORS: DETECTION OF A HIGH ROTATIONAL VELOCITY IN HR CARINAE*
We report optical observations of the luminous blue variable (LBV) HR Carinae which show that the star has reached a visual minimum phase in 2009. More importantly, we detected absorptions due to SiExpand
The Stellar Content of Obscured Galactic Giant H II Regions: II. W42
We present near infrared J, H, and K images and K-band spectroscopy in the giant HII region W42. A massive star cluster is revealed; the color-color plot and K-band spectroscopic morphology of two ofExpand
The Stellar Content of Obscured Galactic Giant H II Regions. III. W31
We present near-infrared (J, H, and K) photometry and moderate-resolution (?/?? = 3000) K-band spectroscopy of the embedded stellar cluster in the giant H II region W31. Four of the brightest fiveExpand
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