Dark Nebulae, Dark Lanes, and Dust Belts

ISBN-13: 9781461411857 / Angielski / Miękka / 2012 / 243 str.

Cooke

Opis

Dark Nebulae, Dark Lanes, and Dust Lanes looks out into the deep sky to see "the spaces between the words..." While not usually considered independently, many of the apparent dark 'voids' in space are among the most compelling telescopic destinations. One well-known example is Barnard's dark nebulae - those striking dark clouds set against (and strikingly obscuring) the background of stars in the Milky Way - but there are countless other less-discussed varieties. Among the brightly illuminated cosmic spectacles that easily come to the astronomer's mind - with few exceptions, such as with the Horsehead Nebula (IC434) - these dark regions are often ignored or commented upon only generally. Because they are only 'seen' via the illuminated matter surrounding them, it is all too easy to overlook the treasure trove they offer the observer, and they frequently comprise much of what is likely to be considered of primary interest in illuminated space objects. We can find dark 'voids' obscuring all kinds of subjects. Within, or perhaps in front of, globular star clusters, many remarkable and complex dark lanes can be observed with just a little care. These features - the spidery lanes of unlit gases and dust - contribute much of the spectacle and differences from cluster to cluster. Perhaps the same is even more true with bright nebulae, the swirling and complex 'curtain' shapes of illuminated matter, often only appearing to be formed in this manner because of the dark gas and dust within them or in between them and us. Similarly, while the dust belts/bands surrounding most galaxies have been described with a little more detail in practical astronomy sources, observers are often left in 'the dark' no pun intended] when it comes to anticipating more specifics of what might actually be seen, especially how to make sense of it. Many observers never realize the vast potential that exists for viewing this galactic aspect alone. While mention of such characteristics is made in a few of the available books, detailed visual references and descriptions for the observer with the kind of detail an observer needs, for a wide range of sights from cluster to cluster, nebula to nebula, or galaxy to galaxy, do not exist: certainly not in a book dedicated just to these types of phenomena. Such illustrations as there are in existing sources usually emphasize the primary lit portions of the object, so that much of the dark regions are lost in the overexposure... and lost to the discussion. While revealing the full dimensions and splendor of the objects, they often obliterate all the delicate inner structures. Typically, there is little discussion of most of these features in any of these resources, even when the effort has been made to provide viewing guidance. All dark voids may be successfully observed using conventional observing methods, but because dark gases and dust usually present a strong infra-red spectrum they are often better seen with different technologies, including certain light-pollution filters, CCD video cameras and image intensifiers, which feature a response skewed to this portion of the spectrum. Dark Nebulae, Dark Lanes, and Dust Lanes explains the optimal ways to observe each object in detail. To find a resource for this kind of information in one volume alone is yet to be realized. Uniquely, this new book provides a readily applicable, focused source of practical information from an observer's point of view for a fascinating area of practical observing.

Recenzje

From the reviews:

"In Dark Nebulae, Dark Lanes, and Dust Belts, Cooke describes a neglected area in the deep-sky observers' canon, the dark nebulae, and in addition he includes almost anything that may be perceived as dark in relation to deep-sky objects. ... The most likely beneficiaries of this book may well be the keen and more-advanced visual deep-sky observer who loves to chase features such as dark 'lanes' in globular star clusters and the dusty areas of spiral galaxies ... ." (Nick Hewitt, The Observatory, Vol. 132 (1231), December, 2012)

"It is clear that Cooke ... has a passion for visually observing many dark areas of the universe. He clearly articulates this passion in his book and provides a wealth of observing challenges for observers with large amateur instruments. ... this reviewer, considers the scope of the book unique, so it would not have any competition in the campus library. Most of the black-and-white figures support the text. ... Overall, a useful resource. Summing Up: Recommended. General audiences and lower-and upper-division undergraduates." (J. R. Kraus, Choice, Vol. 50 (1), September, 2012)

Spis treści

Introduction. - The Nature of Unlit Gases and Dust, and their place in the Universe. - Observing Methods and Equipment. - Dark Lanes in Star Clusters. - Dark Lanes in Diffuse Nebulae.- Barnard's Dark Nebulae. - Galactic Dust Belts, and other Dark Regions. - Catalog and Guide. - Appendices.

O autorze

Antony Cooke's passion for both astronomy and music was clear from an early age, although it was music that ultimately claimed his career. As solo cellist he has played and recorded worldwide. He was also a professor of music at Northwestern University in Chicago. Presently, he is a prominent Hollywood studio musician, as well as a composer for prime time television. However, it has often been said that science and music go hand in hang. With applied and theoretical astronomy never being far behind, he has pursued it as a serious avocation.

As an observer always looking for ways to improve his experience at the eyepiece, Cooke has constructed many telescopes over the years. Increasing apertures were always the hallmark of his often-quirky designs. Finding that the 18-inch aperture of his present telescope was still insufficient to deliver the kind of performance he had in mind, he experimented with newer technologies to bring these elusive goals ever closer. Successful viewing of dark objects requires great contrast. In this respect, some of the newer equipment has proven to be invaluable, enabling dramatic viewing of many dark objects and features in real time and without the need of CCD imaging.

As an author of astronomy books, Cooke also has written Visual Astronomy in the Suburbs (Springer, 2003), Visual Astronomy under Dark Skies (Springer, 2005), and Make Time for the Stars (Springer, 2009). With Dark Nebulae, Dark Lanes and Dust Belts, his astronomical writings continue.

Blurb

As probably the only book of its type, this work is aimed at the observer who wants to spend time with something less conventional than the usual fare. Because we usually see objects in space by means of illumination of one kind or another, it has become routine to see them only in these terms. However, part of almost everything that we see is the defining dimension of dark shading, or even the complete obscuration of entire regions in space. Thus this book is focused on everything dark in space: those dark voids in the stellar fabric that mystified astronomers of old; the dark lanes reported in many star clusters; the magical dust belts or dusty regions that have given so many galaxies their identities; the great swirling 'folds' that we associate with bright nebulae; the small dark feature detectable even in some planetary nebulae; and more.

Many observers pay scant attention to dark objects and details. Perhaps they are insufficiently aware of them or of the viewing potential they hold, but also it may be because of the various viewing challenges that dark objects pose. Discussions on viewing methods and the best equipment for a wide cross section of these objects are included, along with many detailed descriptions. The book contains virtually every dark object worth the observer's attention.

Whether viewing live through the eyepiece or indirectly through CCD or other imaging techniques, this unique compendium and discussion of all things dark in space will hopefully prove compelling and rewarding.