We have observed the cosmic microwave background (CMB) in three regions of sky using the Very Small Array (VSA) in an extended configuration with antennas of beamwidth 2° at 34 GHz. Combined with data from previous VSA observations using a more compact array with larger beamwidth, we measure the power spectrum of the primordial CMB anisotropies

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There are terrestrial signatures of the solar activity cycle in ice core data (Ram & Stoltz 1999), but the variations in the sun's irradiance over the cycle seem too small to account for the signature (Lean 1997; Goode & Dziembowski 2003). Thus, one would expect that the signature must arise from an indirect effect(s) of solar activity. Such an

We present long-slit observations in the red and near infrared of 12 HII galaxies made with the Isaac Newton Telescope at the Roque de los Muchachos Observatory in 1999 February and 2000 January. The spectral range includes the sulphur lines [SII] at 6717, 6731 Å and [SIII] at 9069, 9532 Å. For all the observed galaxies, ion-weighted temperatures

These are the preliminary results of our BVR photometric study. The quasar 1628.5+3808 is shown here only for the sake of illustration of our research. This object showed variations in the three bands. It was observed with a 1.5-meter telecope from the Observatorio Astronómico Nacional at San Pedro Mártir, México. Only non-variable field stars were

The Owl Nebula is a triple-shell planetary nebula with the outermost shell being a faint bow-shaped halo. We have obtained deep narrowband images and high-dispersion echelle spectra in the Hα, [O III], and [N II] emission lines to determine the physical structure of each shell in the nebula. These spatiokinematic data allow us to rule out