scholarly journals Subarcsecond Mid‐Infrared Imaging of Two Post–Asymptotic Giant Branch 21 Micron Sources

2002 ◽  
Vol 573 (2) ◽  
pp. 720-727 ◽  
Author(s):  
Sun Kwok ◽  
Kevin Volk ◽  
Bruce J. Hrivnak
Keyword(s):  
Infrared Imaging ◽  
Asymptotic Giant Branch ◽  
Mid Infrared

scholarly journals A mid-infrared imaging catalogue of post-asymptotic giant branch stars★

2011 ◽  
Vol 417 (1) ◽  
pp. 32-92 ◽  
Author(s):  
Eric Lagadec ◽  
Tijl Verhoelst ◽  
Djamel Mékarnia ◽  
Olga Suárez ◽  
Albert A. Zijlstra ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Asymptotic Giant Branch ◽  
Asymptotic Giant Branch Stars ◽  
Mid Infrared ◽  
Giant Branch Stars

Mid-Infrared Imaging of the Post-Asymptotic Giant Branch Star AC Herculis with the Multiple Mirror Telescope Adaptive Optics System

2003 ◽  
Vol 598 (1) ◽  
pp. L35-L38 ◽  
Author(s):  
Laird M. Close ◽  
Beth Biller ◽  
William F. Hoffmann ◽  
Phil M. Hinz ◽  
John H. Bieging ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Infrared Imaging ◽  
Asymptotic Giant Branch ◽  
Mid Infrared ◽  
Asymptotic Giant Branch Star ◽  
Adaptive Optics System ◽  
Mirror Telescope ◽  
Branch Star

scholarly journals A mid-infrared imaging survey of post-AGB stars

2011 ◽  
Vol 7 (S283) ◽  
pp. 59-62
Author(s):  
Eric Lagadec ◽  
Tijl Verhoelst ◽  
Djamel Mékarnia ◽  
Olga Suárez ◽  
Albert A. Zijlstra ◽  
...  
Keyword(s):  
Binary Systems ◽  
Infrared Imaging ◽  
Morphological Changes ◽  
Asymptotic Giant Branch ◽  
Central Core ◽  
Binary Interaction ◽  
Agb Stars ◽  
Mid Infrared ◽  
Evolved Stars ◽  
Dust Distribution

AbstractPost-AGB stars are key objects for the study of the dramatic morphological changes of low- to intermediate-mass stars on their evolution from the Asymptotic Giant Branch (AGB) towards the planetary nebula stage. There is growing evidences that binary interaction processes may very well have a determining role in the shaping process of many objects, but so far direct evidence is still weak. We aim at a systematic study of the dust distribution around a large sample of post-AGB stars as a probe of the symmetry breaking in the nebulae around these systems. We used imaging in the mid-infrared to study the inner part of these evolved stars to probe direct emission from dusty structures in the core of post-AGB stars in order to better understand their shaping mechanisms. We imaged a sample of 93 evolved stars and nebulae in the mid-infrared using VISIR/VLT, T-Recs/Gemini South and Michelle/Gemini North. We found that all the the proto-planetary nebulae we resolved show a clear departure from spherical symmetry. 59 out of the 93 observed targets appear to be non resolved. The resolved targets can be divided in two categories. The nebulae with a dense central core, that are either bipolar and multipolar. The nebulae with no central core have an elliptical morphology. The dense central torus observed likely host binary systems which triggered fast outflows that shaped the nebulae.

Mid‐Infrared Imaging of Orion BN/KL. II. Luminosity Sources, Extinction Distribution, and the Nature of IRc2

1998 ◽  
Vol 509 (1) ◽  
pp. 283-298 ◽  
Author(s):  
D. Y. Gezari ◽  
D. E. Backman ◽  
M. W. Werner
Keyword(s):  
Infrared Imaging ◽  
Mid Infrared

Polarization-independent broadband achromatic metalens in the mid-infrared (3-5 μm) region

2021 ◽  
Author(s):  
Wenhui Xiong ◽  
Chenchen Sha ◽  
Jianping Ding
Keyword(s):  
Numerical Simulation ◽  
Infrared Imaging ◽  
Chromatic Aberration ◽  
Infrared Region ◽  
Mid Infrared ◽  
Light Manipulation ◽  
Wavefront Shaping ◽  
Polarization Independent

Abstract With superior capabilities for light manipulation and wavefront shaping, the metasurface recently has caught growing attention. However, the presence of chromatic aberration hinders metasurfaces, especially metalenses, from wider applications. Here, we design a polarization-independent broadband achromatic focusing metalens in the mid-infrared region, which covers continuous bands in 3-5 μm. Numerical simulation shows that different wavelengths can be focused to the same plane with a nearly diffraction-limited resolution, and can achieve an average focusing efficiency of nearly 70% in the whole bandwidth. We expect that our approach can underpin the development of integrated and mid-infrared imaging and detection.

scholarly journals Mid-infrared imaging of brown dwarfs in binary systems

2008 ◽  
Vol 480 (1) ◽  
pp. 193-198 ◽  
Author(s):  
K. Geißler ◽  
G. Chauvin ◽  
M. F. Sterzik
Keyword(s):  
Binary Systems ◽  
Infrared Imaging ◽  
Brown Dwarfs ◽  
Mid Infrared
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