Read e-book online Very Low-Mass Stars and Brown Dwarfs (Cambridge Contemporary PDF

By Rafael Rebolo, Maria Rosa Zapatero-Osorio, Editors

ISBN-10: 0521663350

ISBN-13: 9780521663359

Here's a cutting-edge assessment of our present wisdom of brown dwarfs and intensely low-mass stars. the search for, and examine of, those elusive gadgets is presently essentially the most dynamic components of study in astronomy. This quantity provides assessment articles from a workforce of overseas experts who verify the fantastic growth during this box some time past few years. The contributed chapters overview either the newest observations and theories, making this an important connection with some of the most intriguing fields in modern astronomy.

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Extra info for Very Low-Mass Stars and Brown Dwarfs (Cambridge Contemporary Astrophysics)

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03 44 00 +23 57 00 : Pleiades -500 FIGURE 500 2. Mosaic of Palomar Sky Survey fields around the Pleiades cluster. Dashed circles have radii 2 to 10°. references therein, is the latest in a line of microdensitometers designed at Edinburgh. The design philosophy of the machine was that the accuracy of the data produced should be limited, as far as possible, only by the plate being scanned. The machine is based around a Tesa-Leitz PMM 654 volumetric precision metrology unit. 5 mm in the plate holder).

This general view of astrometry is particularly surprising in view of the phenomenal demand amongst the astronomical community for the rapid release of HIPPARCOS results. " reinforces the fact that such data is of fundamental importance to every field of astronomy - from the study of the faintest "non-quite stars", to the study of galaxy formation and the early universe. I can only hope that this review will go some way towards highlighting the dramatic and exciting advances which have been made in recent years in the measurement of trigonometric distances, and to point out the areas where these advances have, and can be expected to, increase our understanding of the faintest members of stellar clusters.

3. Current ground-based parallaxes For long the mainstay of ground-based astrometry, photographic parallax programs have now been made essentially obsolete by the introduction of CCD programs. For example, the long running USNO program (Harrington et al. 1993) has now been terminated in favour of their CCD astrometric program (Dahn 1998). This revolution in ground-based astrometry has largely followed from Monet &; Dahn's early experiments with CCD astrometry on the KPNO 4-m (Monet & Dahn 1983), which was then extended to a fully fledged program at the USNO's Flagstaff station, and then further implemented by numerous astronomers on telescopes world wide.

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Very Low-Mass Stars and Brown Dwarfs (Cambridge Contemporary Astrophysics) by Rafael Rebolo, Maria Rosa Zapatero-Osorio, Editors

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