Broad-band imaging of the Beta Pictoris circumstellar disk

1987 ◽  
Vol 319 ◽  
pp. L23 ◽  
Author(s):  
Francesco Paresce ◽  
Christopher Burrows
Keyword(s):  
Broad Band ◽  
Circumstellar Disk ◽  
Beta Pictoris

A Circumstellar Disk Around beta Pictoris

Science ◽  
1984 ◽  
Vol 226 (4681) ◽  
pp. 1421-1424 ◽  
Author(s):  
B. A. SMITH ◽  
R. J. TERRILE
Keyword(s):  
Circumstellar Disk ◽  
Beta Pictoris

The structure of the Beta Pictoris circumstellar disk from combined IRAS and coronagraphic observations

1989 ◽  
Vol 337 ◽  
pp. 494 ◽  
Author(s):  
Pawel Artymowicz ◽  
Christopher Burrows ◽  
Francesco Paresce
Keyword(s):  
Circumstellar Disk ◽  
Beta Pictoris

Coronagraphic imaging of the Beta Pictoris circumstellar disk - Evidence of changing disk structure within 100 AU

1993 ◽  
Vol 411 ◽  
pp. L41 ◽  
Author(s):  
David A. Golimowski ◽  
Samuel T. Durrance ◽  
Mark Clampin
Keyword(s):  
Circumstellar Disk ◽  
Disk Structure ◽  
Beta Pictoris

scholarly journals Optical Observations of the Beta Pictoris Disk

1992 ◽  
Vol 9 ◽  
pp. 375-375
Author(s):  
B. A. Smith
Keyword(s):  
Ccd Camera ◽  
Optical Observations ◽  
Circumstellar Disk ◽  
Morphological Property ◽  
Beta Pictoris

Multispectral photometric and polarimetrie observations of the Beta Pictoris circumstellar disk, made with a coronagraphic CCD camera at the Las Campanas Observatory between 1984 and 1989 (Smith et al 1992a), indicate that the nearly edge-on, highly flattened disk extends to a distance of more than 60 arcsec (1000au) from the star, with a nearly constant projected thickness of 2.8 arcsec (45 au) on the plane of the sky. A peculiar morphological property of the disk is its apparent asymmetry, with the northeast extension appearing somewhat longer and brighter than its southwest counterpart. Because of its implications for disk dynamics and morphology, this anomalous structure is perhaps the most puzzling phenomenon yet associated with the Beta Pictoris disk and deserves further study.

Chronic Laser Exposure Effects on Rabbit Retina

1972 ◽  
Vol 30 ◽  
pp. 54-55
Author(s):  
Burton B. Silver ◽  
Theodore Lawwill
Keyword(s):  
Laser Irradiation ◽  
Laser Light ◽  
Broad Band ◽  
Argon Laser ◽  
Atropine Sulfate ◽  
Ultrastructural Changes ◽  
Laser Exposure ◽  
Rabbit Retina ◽  
Histological Changes ◽  
Threshold Doses

Dutch-belted 1 to 2.5 kg anesthetized rabbits were exposed to either xenon or argon laser light administered in a broad band, designed to cover large areas of the retina. For laser exposure, the pupil was dilated with atropine sulfate 1% and pheny lephrine 10%. All of the laser generated power was within a band centered at 5145.0 Anstroms. Established threshold for 4 hour exposures to laser irradiation are in the order of 25-35 microwatts/cm2. Animals examined for ultrastructural changes received 4 hour threshold doses. These animals exhibited ERG, opthalmascopic, and histological changes consistent with threshold damage.One month following exposure the rabbits were killed with pentobarbitol. The eyes were immediately enucleated and dissected while bathed in 3% phosphate buffered gluteraldehyde.

Real-ear Masking Calibration for Portable Pure-Tone Audiometers

1984 ◽  
Vol 15 (4) ◽  
pp. 289-294
Author(s):  
Martin S. Robinette ◽  
Robert H. Brey
Keyword(s):  
Pure Tone ◽  
Broad Band ◽  
Resistive Network ◽  
Many Instruments

A transformer mixing network is described which allows the calibration of broad-band masking for portable audiometers that lack a built-in mixing network. For many instruments the transformer network is preferable to the resistive network previously published.

The circumstellar disk of the Be star 28 (ω) CMa

2003 ◽  
Vol 6 ◽  
pp. 257-257
Author(s):  
S. Štefl ◽  
W. Nowotny-Schipper ◽  
J. Reunanen
Keyword(s):  
Circumstellar Disk ◽  
Be Star
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