The solar rotation rate at latitudes 0 deg, 15 deg and 30 deg has been inferred by averaging the results of 120 regions of 15 degx15 deg, which have been studied over a total area of about 75 deg in latitude and 360 deg in longitude. A local helioseismology technique, the ring diagram analysis method, has been used to analyse the horizontal

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We present time-resolved spectroscopy of the soft X-ray transient XTE J2123-058 in outburst. Spectral coverage of 3700-6700A was achieved spanning two orbits of the binary. The strongest emission lines are HeII 4686A and CIII/NIII 4640A (Bowen blend). Other weak emission lines of HeII and CIV are present and Balmer lines show a complex structure

The first unambiguous detection of meteoroids impacting the night side of the Moon was obtained during the 1999 Leonid storm. Up to eight optical flashes were recorded with CCD video cameras attached to small telescopes on November 18, 1999. Six impacts were videotaped by at least two independent observers at the same times and lunar locations

An inversion technique to recover LTE one-dimensional model photospheres for late-type stars, which was previously applied to the Sun by Allende Prieto et al. in 1998, is now employed to reconstruct, semiempirically, the photospheres of cooler dwarfs: the metal-poor Groombridge 1830 and the active star of solar metallicity ɛ Eridani. The model

We present high angular and velocity resolution two-dimensional kinematic observations in the spectral lines of Hα and CO J=1-->0 of the circumnuclear starburst region in the barred spiral galaxy M100, and compare them with kinematics derived from our previously published numerical modeling. The Hα data, fully sampled and at subarcsecond resolution