The stellar initial mass function (IMF) integrated over an entire galaxy is an integral over all separate star-formation events. Since most stars form in star clusters with different masses the integrated IMF becomes an integral of the (universal or invariant) canonical stellar IMF over the star-cluster mass function. This integrated IMF is steeper

IAUC 8639 available at Central Bureau for Astronomical Telegrams.

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The system SBS 0909+532A, B is a double consisting of a quasar and a fainter component that was, until now, spectroscopically unresolved. Spectra taken in good seeing conditions ( {FWHM}=1^{''} ) with the 4.2 m William Herschel Telescope separate the A and B components, showing that both are quasars with the same redshift, z=1.377 , and identical

We present the results of a wide-field survey for extremely red objects (EROs), based on J and R band imaging. The survey covers 2.89 deg2, consisting of 50 single fields, each approximately 210 arcmin2 in size. This survey provides a sample of 60 extended objects with a colour of R-J ≥ 5 and J band magnitudes more than 10σ above background (18^mag

The interpretation of detailed spectroscopic observations of different stars reveals inconsistencies, due likely to inadequacies of the underlying hypothesis. The high accuracy of the parallaxes measured by the Hipparcos satellite established a firm reference frame that is used here to test theoretical classical model atmospheres for cool stars