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| Author | : Stephen Craig Marsden |
| Publisher | : |
| Total Pages | : 470 |
| Release | : 2004 |
| Genre | : Stars |
| ISBN | : |
This thesis describes optical studies of magnetic dynamo activity amongst solar-type zero-age main sequence stars in the young (~30-50 Myr) open clusters IC 2391 and IC 2602.
| Author | : S.S. Hasan |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 561 |
| Release | : 2010-03-10 |
| Genre | : Science |
| ISBN | : 3642028594 |
Solar physics in India has a tradition that can be traced to the setting up of the Kodaikanal Observatory in 1899 when the Madras Observatory was relocated to a high altitude site with a view to initiate observations of the sun. This conference on Magnetic Coupling between the Interior and the Atmosphere of the Sun during 2–5 December 2008 was planned to coincide with centenary of the Evershed effect discovery at Kodaikanal in 1909. The aim of this meeting was to bring to a critical focus a comprehensive - derstanding of the important issues pertaining to solar magnetism with particular emphasis on the various MHD processes that operate in the solar atmosphere. The current status of magnetic eld measurements and their implications in the light of recenttheoriesandnumericalmodelingthataddressthe fundamentalscalesandp- cessesinthehighlymagnetizedturbulentplasmawerereviewedduringthismeeting. The meeting was timely for the following reasons: Space observations such as from SOHO and TRACE have provided a wealth of multiwavelength observations onprocessesoccurringinregionsofthe atmosphereextendingfromthe photosphere up to the outer corona. With the launch of Hinode and STEREO in 2006 and of SDO (Solar Dynamics Observatory) shortly, this conference provided a platform for in-depth discussions on new results from various space missions as well as a comparison with ground-based observing facilities such as the Swedish 1-m Solar Telescope. Using sophisticated image processing techniques, such telescopes r- tinelygenerateobservationswitharesolutionbetterthan0. 1arcsec,therebyyielding more informative diagnostics for instance of the microstructure of ux tubes.
| Author | : Tersi Marcela Arias |
| Publisher | : |
| Total Pages | : 48 |
| Release | : 2012 |
| Genre | : Cool stars |
| ISBN | : |
The young open clusters alpha-Persei, IC 2391, and IC 2602 contain main-sequence late type stars that are fast and ultra-fast rotators from which optical Ca II H & K emission lines can be detected as a signature of magnetic and chromospheric activity. In this work the author observed the activity of these types of stars and searched for the super-saturation effect seen in X-ray wavelengths, which manifests as a decline in flux with respect to increasing rotational speed and decreasing Rossby number. To do so, the author analyzed optical spectra of a large sample of these rotators from the three star clusters mentioned above and other stars from the solar neighborhood. The author found that the flux from the chromospheric emission of Ca II H & K measured from these stars shows no evidence of decline in optical flux as a function of increased rotational velocity or smaller Rossby number. The author concludes that there is no super-saturation in the chromosphere, in contrast to the results of the X-ray studies. These findings are in agreement with a recent study by Marsden et al of chromospheric flux from calcium infrared triplet lines emission of fast and ultra fast rotators in the IC 2391 and IC 2602 star clusters. This lack of "super-saturation" supports the idea of coronal-stripping as the cause of saturation and super-saturation in stellar chromospheres and corona, but the detailed underlying mechanism is still under investigation.
| Author | : Naval Research Laboratory (U.S.) |
| Publisher | : |
| Total Pages | : 632 |
| Release | : 1972 |
| Genre | : Naval research |
| ISBN | : |
| Author | : Roald E. Gershberg |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 520 |
| Release | : 2005-07-12 |
| Genre | : Science |
| ISBN | : 9783540212447 |
The first comprehensive monograph on this active and productive field of research investigates solar-type activity amongst the large spectrum of low- and middle-mass main sequence stars, and presents the subject in a systematic and comprehensive fashion.
| Author | : C. J. Schrijver |
| Publisher | : Cambridge University Press |
| Total Pages | : 404 |
| Release | : 2008-10-30 |
| Genre | : Science |
| ISBN | : 1139425420 |
This timely volume provides the first comprehensive review and synthesis of current understanding of magnetic fields in the Sun and similar stars. Magnetic activity results in a wealth of phenomena - including starspots, non-radiatively heated outer atmospheres, activity cycles, deceleration of rotation rates, and even, in close binaries, stellar cannibalism - all of which are covered clearly and authoritatively. This book brings together for the first time recent results in solar studies and stellar studies. The result is an illuminating new view of stellar magnetic activity. Key topics include radiative transfer, convective simulations, dynamo theory, outer-atmospheric heating, stellar winds and angular momentum loss. Researchers are provided with a state-of-the-art review of this exciting field, and the pedagogical style and introductory material make the book an ideal and welcome introduction for graduate students.
| Author | : Neill I. Reid |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 492 |
| Release | : 2013-11-27 |
| Genre | : Science |
| ISBN | : 1447136632 |
Perhaps the most common question that a child asks when he or she sees the night sky from a dark site for the first time is: 'How many stars are there?' This happens to be a question which has exercised the intellectual skills of many astronomers over the course of most of the last century, including, for the last two decades, one of the authors of this text. Until recently, the most accurate answer was 'We are not certain, but there is a good chance that almost all of them are M dwarfs. ' Within the last three years, results from new sky-surveys - particularly the first deep surveys at near infrared wavelengths - have provided a breakthrough in this subject, solidifying our census of the lowest-mass stars and identifying large numbers of the hitherto almost mythical substellar-mass brown dwarfs. These extremely low-luminosity objects are the central subjects of this book, and the subtitle should be interpreted accordingly. The expression 'low-mass stars' carries a wide range of meanings in the astronomical literature, but is most frequently taken to refer to objects with masses comparable with that of the Sun - F and G dwarfs, and their red giant descendants. While this definition is eminently reasonable for the average extragalactic astronomer, our discussion centres on M dwarfs, with masses of no more than 60% that of the Sun, and extends to 'failed stars' - objects with insufficient mass to ignite central hydrogen fusion.
| Author | : P Murdin |
| Publisher | : CRC Press |
| Total Pages | : 5610 |
| Release | : 2001-01-01 |
| Genre | : Science |
| ISBN | : 1000523039 |
In a unique collaboration, Nature Publishing Group and Institute of Physics Publishing have published the most extensive and comprehensive reference work in astronomy and astrophysics. This unique resource covers the entire field of astronomy and astrophysics and this online version includes the full text of over 2,750 articles, plus sophisticated search and retrieval functionality and links to the primary literature. The Encyclopaedia's authority is assured by editorial and advisory boards drawn from the world's foremost astronomers and astrophysicists. This first class resource is an essential source of information for undergraduates, graduate students, researchers and seasoned professionals, as well as for committed amateurs, librarians and lay people wishing to consult the definitive astronomy and astrophysics reference work.
