scholarly journals THE HIGH ANGULAR RESOLUTION MULTIPLICITY OF MASSIVE STARS

2009 ◽  
Vol 137 (2) ◽  
pp. 3358-3377 ◽  
Author(s):  
Brian D. Mason ◽  
William I. Hartkopf ◽  
Douglas R. Gies ◽  
Todd J. Henry ◽  
John W. Helsel
Keyword(s):  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution

scholarly journals Taking the Measure of Massive Stars and their Environments with the CHARA Array Long-baseline Interferometer

2016 ◽  
Vol 12 (S329) ◽  
pp. 156-160
Author(s):  
Douglas R. Gies
Keyword(s):  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution ◽  
State University ◽  
Luminous Blue Variables ◽  
University Center ◽  
Long Baseline ◽  
Multiple Stars ◽  
Mount Wilson Observatory ◽  
Georgia State University

AbstractMost massive stars are so distant that their angular diameters are too small for direct resolution. However, the observational situation is now much more favorable, thanks to new opportunities available with optical/IR long-baseline interferometry. The Georgia State University Center for High Angular Resolution Astronomy Array at Mount Wilson Observatory is a six-telescope instrument with a maximum baseline of 330 meters, which is capable of resolving stellar disks with diameters as small as 0.2 milliarcsec. The distant stars are no longer out of range, and many kinds of investigations are possible. Here we summarize a number of studies involving angular diameter measurements and effective temperature estimates for OB stars, binary and multiple stars (including the σ Orionis system), and outflows in Luminous Blue Variables. An enlarged visitors program will begin in 2017 that will open many opportunities for new programs in high angular resolution astronomy.

scholarly journals A High Angular Resolution Survey of Massive Stars in Cygnus OB2: JHK Adaptive Optics Results from the Gemini Near-Infrared Imager

2020 ◽  
Vol 160 (3) ◽  
pp. 115
Author(s):  
S. M. Caballero-Nieves ◽  
D. R. Gies ◽  
E. K. Baines ◽  
A. H. Bouchez ◽  
R. G. Dekany ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Near Infrared ◽  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution ◽  
Infrared Imager

scholarly journals Interferometry of massive stars: the next step

2014 ◽  
Vol 9 (S307) ◽  
pp. 480-489
Author(s):  
Ph. Stee ◽  
A. Meilland ◽  
O. L. Creevey
Keyword(s):  
Differential Rotation ◽  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution ◽  
Third Generation ◽  
Optical Interferometer ◽  
Large Telescope ◽  
Very Large Telescope ◽  
Beam Combiner ◽  
Radial Pulsations

AbstractWe present some new and interesting results on the complementarity between asteroseismology and interferometry, the detection of non-radial pulsations in massive stars and the possibility for evidencing differential rotation on the surface of Bn stars. We also discuss the curretn interferometric facilities, namely the Very Large Telescope Interferometer (VLTI)/AMBER, VLTI/MIDI, VLTI/PIONIER within the European Southern Observatory (ESO) context and the Center for High Angular Resolution Astronomy (CHARA) array with their current limitations. The forthcoming second-generation VLTI instruments GRAVITY and MATISSE are presented as well as the FRIEND prototype in the visible spectral domain and an update of the Navy Precision Optical Interferometer (NPOI). A conclusion is presented with a special emphasis on the foreseen difficulties for a third generation of interferometric instruments within the (budget limited) Extremely Large Telescope framework and the need for strong science cases to push a future visible beam combiner.

scholarly journals High-angular resolution observations of the Pistol star

2010 ◽  
Vol 6 (S272) ◽  
pp. 616-617
Author(s):  
Christophe Martayan ◽  
Ronny Blomme ◽  
Jean-Baptiste Le Bouquin ◽  
Anthony Merand ◽  
Guillaume Montagnier ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution ◽  
Near Ir ◽  
First Results ◽  
Formation And Evolution ◽  
Luminous Blue Variable

AbstractFirst results of near-IR adaptive optics (AO)-assisted imaging, interferometry, and spectroscopy of this Luminous Blue Variable (LBV) are presented. They suggest that the Pistol Star is at least double. If the association is physical, it would reinforce questions concerning the importance of multiplicity for the formation and evolution of extremely massive stars.

scholarly journals THE MULTIPLICITY OF MASSIVE STARS: A HIGH ANGULAR RESOLUTION SURVEY WITH THEHSTFINE GUIDANCE SENSOR

2014 ◽  
Vol 149 (1) ◽  
pp. 26 ◽  
Author(s):  
E. J. Aldoretta ◽  
S. M. Caballero-Nieves ◽  
D. R. Gies ◽  
E. P. Nelan ◽  
D. J. Wallace ◽  
...  
Keyword(s):  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution

scholarly journals SOUTHERN MASSIVE STARS AT HIGH ANGULAR RESOLUTION: OBSERVATIONAL CAMPAIGN AND COMPANION DETECTION

2014 ◽  
Vol 215 (1) ◽  
pp. 15 ◽  
Author(s):  
H. Sana ◽  
J.-B. Le Bouquin ◽  
S. Lacour ◽  
J.-P. Berger ◽  
G. Duvert ◽  
...  
Keyword(s):  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution

scholarly journals Circumstellar Environments of MYSOs Revealed by IFU Spectroscopy

2014 ◽  
Vol 9 (S307) ◽  
pp. 453-454
Author(s):  
F. Navarete ◽  
A. Damineli ◽  
C. L. Barbosa ◽  
R. D. Blum
Keyword(s):  
Angular Resolution ◽  
Massive Stars ◽  
Central Star ◽  
Absorption Lines ◽  
High Angular Resolution ◽  
Observational Constraints ◽  
Central Mass ◽  
Preliminary Results ◽  
Accretion Process ◽  
Circumstellar Environments

AbstractFormation of massive stars (M > 8 M⊙) is still not well understood and lacks of observational constraints. We observed 7 MYSO candidates using the NIFS spectrometer at Gemini North Telescope to study the accretion process at high angular resolution (~ 50 mas) and very closer to the central star. Preliminary results for 2 sources have revealed circumstellar structures traced by Brackett-Gamma, CO lines and extended H2 emission. Both sources present kinematics in the CO absorption lines, suggesting rotating structures. The next step will derive the central mass of each source by applying a keplerian model for these CO features.

scholarly journals A HIGH ANGULAR RESOLUTION SURVEY OF MASSIVE STARS IN CYGNUS OB2: RESULTS FROM THEHUBBLE SPACE TELESCOPEFINE GUIDANCE SENSORS

2014 ◽  
Vol 147 (2) ◽  
pp. 40 ◽  
Author(s):  
S. M. Caballero-Nieves ◽  
E. P. Nelan ◽  
D. R. Gies ◽  
D. J. Wallace ◽  
K. DeGioia-Eastwood ◽  
...  
Keyword(s):  
Angular Resolution ◽  
Massive Stars ◽  
High Angular Resolution

Small-Angle Electron Scattering (SAES) of Polymers

1985 ◽  
Vol 43 ◽  
pp. 78-79
Author(s):  
Ralph Oralor ◽  
Pamela Lloyd ◽  
Satish Kumar ◽  
W. W. Adams
Keyword(s):  
Electron Scattering ◽  
Small Angle ◽  
Angular Resolution ◽  
Structural Features ◽  
Objective Lens ◽  
High Angular Resolution ◽  
Push Button ◽  
First Case ◽  
Diffraction Mode ◽  
Very High

Small angle electron scattering (SAES) has been used to study structural features of up to several thousand angstroms in polymers, as well as in metals. SAES may be done either in (a) long camera mode by switching off the objective lens current or in (b) selected area diffraction mode. In the first case very high camera lengths (up to 7Ø meters on JEOL 1Ø ØCX) and high angular resolution can be obtained, while in the second case smaller camera lengths (approximately up to 3.6 meters on JEOL 1Ø ØCX) and lower angular resolution is obtainable. We conducted our SAES studies on JEOL 1ØØCX which can be switched to either mode with a push button as a standard feature.

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