Velocity and magnetic fields are derived from subtracting intensity measurements made at different times and, normally, under different conditions. This differential imaging property puts important requirements on image stabilization. Examples of the implications for the Solar Orbiter mission are discussed. Similarly, we review how spectral and

We present integral field spectroscopy of two selected zones in the Orion nebula obtained with the Potsdam Multi-Aperture Spectrophotometer, covering the optical spectral range from 3500 to 7200 Å and with a spatial resolution of 1 arcsec. The observed zones are located on the prominent Bright bar and on the brightest area at the north-east of the

The luminous infrared galaxy Arp 299 (IC 694 + NGC 3690) is studied using optical integral field spectroscopy obtained with the INTEGRAL system, together with archival Hubble Space Telescope WFPC2 and NICMOS images. The stellar and ionized gas morphology shows λ-dependent variations due to the combined effects of the dust internal extinction and

Context: In the past few years, a new class of high mass X-ray binaries (HMXRB) has been claimed to exist, the supergiant fast X-ray transients (SFXT). These are X-ray binary systems with a compact companion orbiting a supergiant star which show very short and bright outbursts in a series of activity periods overimposed on longer quiescent periods

We have performed a data analysis of the high-mass X- ray binary EXO 2030+375 using the three high-energy instruments on board INTEGRAL during a normal outburst of the source. The observations were made during the INTEGRAL Performance Verification phase in December 2002 and represent a total on-source time of about ¡£¢¥¤ s. X-ray pulsations with a

We present a type-I outburst of the high-mass X-ray binary EXO 2030+375, detected during INTEGRAL's Performance and Verification phase in December 2002 (on-source time about 106 s). In addition, six more outbursts have been observed during INTEGRAL's Galactic Plane Scans. X-ray pulsations have been detected with a pulse period of 41.691798 ± 0