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NAM2012 - All Presentation Details

Record 754 of 756

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Searching for companions in CRIRES spectra and slit-viewer images of telluric standards

Author: Jonathan Smoker

European Southern Observatory, Chile

Co-Authors: M. Rodriguez, ESO Chile H. Boffin, ESO Chile S. Guieu, ESO Chile A. Smette, ESO Chile F. P. Keenan, Queen's University Belfast C. Hill, Queen's University Belfast

Session: STA2: Binary Stars: Duplicity is Everywhere

Presentation type: Poster      Poster Session B   


This project aims at producing an atlas of the 500+ mainly early-type telluric standards observed to date with CRIRES, which is the near to- mid-infrared high-resolution spectrometer on the VLT. The project comprises two parts: (1) To produce spectra of all of the telluric standards taken to date that can be used for a variety of scientific and technical purposes (looking for the presence of companions in the stellar spectra, searching for warm CO in the disks of early-type stars, spectral analysis of B type stars to act as templates for stars with high extinction in the optical, avoiding tellurics in the future that show emission-line features etc) and (2) To use the slit viewer images of CRIRES in order to search for previously unresolved stellar companions. These slit-viewer images (typically in J, H or K bands) have a plate scale of around 0.05 arcseconds and, due to the adaptive optics system in CRIRES, have a spatial resolution of typically <0.2 arcseconds. Although they are shallow (integration times generally a few seconds), the high-resolution infrared nature of the observations makes them useful for detecting new companions. Due to the properties of speckle, the putative faint companions will have to be followed up at a future date to determine (1) If they are really stellar objects and (2) If the proper motions are the same in order to confirm if they are companions or just background objects. Initial results are presented including a sub-sample of the reduced spectra and a number of cases that show putative companions.

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