25. Stellar Photometry and Polarimetry

Photometry and Polarimetry of Mercury

Stellar Polarimetry with Espadons

ESPaDOnS is a new-generation cross-dispersed échelle spectropolarimeter, the commissioning phase of which is scheduled at the Canada-France-Hawaii Telescope (CFHT) for spring 2004. This instrument will provide full coverage of the optical domain (370 nm to 1,000 nm) in all polarization states (circular and linear) at a resolving power of about 70,000, with a peak efficiency of 20% (telescope an...

WFPC2 Stellar Photometry with HSTphot

HSTphot, a photometry package designed to handle the undersampled PSFs found in WFPC2 images, is introduced and described, as well as some of the considerations that have to be made in order to obtain accurate PSF-fitting stellar photometry with WFPC2 data. Tests of HSTphot’s internal reliability are made using multiple observations of the same field, and tests of external reliability are made ...

Polarimetry of young stellar objects { III

We present the rst imaging circular polarimetry of the Orion Molecular Cloud, OMC-1. The observations, taken in the J , H , K n and nbL bands, reveal a complex pattern of circular polarisation. Globally, there is a background circular polarisation of the order of 2 percent in the K n band, conforming to the typical quadrupolar patterns that have been observed in other outtow sources. Overlaying...

Stellar Photometry with CCD Sub - Pixel SensitivityVariationsA

The variation of sensitivity within a pixel of a CCD can be substantial and also substantially the same for each pixel of the CCD. Variations of the order of 10%, now being found for CCDs, can lead to errors in stellar photometry on the order of a few percent, dependent on the size of the stellar image and the position of its center within the pixel. An enhanced version of Starman, a proole tti...