Passband reconstruction from photometry

Image Reconstruction from Incomplete Data

Image Reconstruction from Incomplete Data

Crowded - field photometry from HST - imaging ⋆

We present a thorough investigation of stellar photometry based on HST imaging of crowded fields at 85 and 10 from the centre of the high-surface brightness elliptical galaxy M32. The Principal Investigators of the present archive data have elsewhere presented an impressive colour-magnitude diagram of the field at 85. Based on the same data we enlarge on their photometric analysis and supplemen...

WFPC2 Photometry from Subtraction of TinyTim PSFs

Based upon the subtraction of TinyTim PSFs from PC1 point-like objects, a method has been developed to determine the optimal values for the telescope jitter and the Z4 relative focus during calibration or science observations. Using these jitter and focus values, an optimal TinyTim PSF, computed over a resampled grid, is then iteratively fitted to the object, yielding an improvement in the PSF ...

Oscillations in Arcturus from Wire Photometry

Observations of the red giant Arcturus (α Boo) obtained with the star tracker on the Wide Field Infrared Explorer (WIRE) satellite during a baseline of 19 successive days in 2000 July-August are analysed. The amplitude spectrum has a significant excess of power at low-frequencies. The highest peak is at ∼ 4.1 μHz (2.8 d), which is in agreement with previous ground-based radial velocity studies....