Dark Companions of StarsDark Companions of Stars

If you want to understand the invisible, look careful at the visible.

Author: P. Kamp

Publisher: Springer Science & Business Media

ISBN: 9789400946927


Page: 124

View: 981

If you want to understand the invisible, look careful at the visible. The Talmud A 'bird's eye' or rather a distant spacecraft's view of the solar system reveals an assembly of planets, terrestrial, giant and Pluto. The orbital motions are in the same sense, counter clockwise, as seen from the north of the general flattened space within which the planetary motions are confined. This state of affairs is corevolving and, more or less, coplanar. The rotations are in the same sense as the revolutions, with the strikiiig exception of Uranus whose sense of rotation is perpendicular to its plane of revolution. As time goes by, most of the planets remain fairly close to a general plane and at no time stray unduly far from it; they remain confined within a rather narrow box or disk with a large 'equatorial' extent. The most distant planet, Pluto, requires a diameter of some 80 astronomical units for the disk. One astronomical unit is the distance of the Earth to the Sun, to be more precise the length of half the major axis of the Earth's slightly elliptical orbit around the Sun, and amounts to nearly 149600000 km.

NASA Technical TranslationNASA Technical Translation

The mass of the dark companion which causes these perturbations was found to be 0.008 , only eight times the mass of ... The search for dark companions with masses of the order of 0.01 is thus limited to stars not farther than 10 pc .

Author: United States. National Aeronautics and Space Administration


ISBN: UOM:39015039958338


Page: 744

View: 892

New Light on Dark StarsNew Light on Dark Stars

All G stars with potential planetary-mass companions with periods of less than 10 days have been monitored extensively, and (except for HD 209458, see Section 11.5.3) photometric variations of more than 0.2 millimagnitudes can be ruled ...

Author: Neil Reid

Publisher: Springer Science & Business Media

ISBN: 9783540276104


Page: 560

View: 752

There has been very considerable progress in research into low-mass stars, brown dwarfs and extrasolar planets during the past few years, particularly since the fist edtion of this book was published in 2000. In this new edtion the authors present a comprehensive review of both the astrophysical nature of individual red dwarf and brown dwarf stars and their collective statistical properties as an important Galactic stellar population. Chapters dealing with the observational properies of low-mass dwarfs, the stellar mass function and extrasolar planets have been completely revised. Other chapters have been significantly revised and updated as appropriate, including important new material on observational techniques, stellar acivity, the Galactic halo and field star surveys. The authors detail the many discoveries of new brown dwarfs and extrasolar planets made since publication of the first edition of the book and provide a state-of-the-art review of our current knowledge of very low-mass stars, brown dwarfs and extrasolar planets, including both the latest observational results and theoretical work.

Physics of Binary Star EvolutionPhysics of Binary Star Evolution

(This triple star possibility for dark companions was first put forward by Trimble & Thorne [1969].) Detection of large radial velocity variations caused by an unseen companion was the first method proposed for detection of the presence ...

Author: Thomas M Tauris

Publisher: Princeton University Press

ISBN: 9780691179087


Page: 864

View: 388

A graduate-level textbook on the astrophysics of binary star systems and their evolution Physics of Binary Star Evolution is an up-to-date textbook on the astrophysics and evolution of binary star systems. Theoretical astrophysicists Thomas Tauris and Edward van den Heuvel cover a wide range of phenomena and processes, including mass transfer and ejection, common envelopes, novae and supernovae, X-ray binaries, millisecond radio pulsars, and gravitational wave (GW) sources, and their links to stellar evolution. The authors walk through the observed properties and evolution of different types of binaries, with special emphasis on those containing compact objects (neutron stars, black holes, and white dwarfs). Attention is given to the formation mechanisms of GW sources—merging double neutron stars and black holes as well as ultra-compact GW binaries hosting white dwarfs—and to the progenitors of these sources and how they are observed with radio telescopes, X-ray satellites, and GW detectors (LIGO, Virgo, KAGRA, Einstein Telescope, Cosmic Explorer, and LISA). Supported by illustrations, equations, and exercises, Physics of Binary Star Evolution combines theory and observations to guide readers through the wonders of a field that will play a central role in modern astrophysics for decades to come. 465 equations, 47 tables, and 350+ figures More than 80 exercises (analytical, numerical, and computational) Over 2,500 extensive, up-to-date references

The MonistThe Monist

The peculiar variations in the motions of the bright stars Sirius and Procyon gave rise , more than half a century ago , to the theory that these changes , periodical in character , were due to the presence of dark companions .

Author: Paul Carus


ISBN: STANFORD:36105007382984


Page: 750

View: 500

Vols. 2 and 5 include appendices.

The universal instructor or Self culture for allThe universal instructor or Self culture for all

It was the apparent change in the relative place of this star which first led Halley to suspect the existence of the ... there is reason to believe that both these stars are moving in orbits round large dark companions , or rather round ...

Author: Ward, Lock and co, ltd


ISBN: OXFORD:600029129


Page: 970

View: 564


Infrared observations permit detection , and searches have been conducted in regions of dark clouds with young stellar objects . Astronomers also examine nearby stars for faint , low - mass companions .

Author: Michael Zeilik

Publisher: Cambridge University Press

ISBN: 0521800900


Page: 586

View: 961

The ninth edition of this successful textbook describes the full range of the astronomical universe and how astronomers think about the cosmos.

Physics of Stars and Stellar SystemsPhysics of Stars and Stellar Systems

There are some 200 known stars within this radius . Table 3 lists data on some of the known or suspected dark companions . TABLE 3 1900,0 P , MMO Star my a , e P a 8 spectrum years n Cas on 43m . + 57 ° 17 ' 24 Ross 614 6 24 .3 -2 44 ...

Author: Aleksandr Aleksandrovich Mikhaĭlov


ISBN: UIUC:30112008550813


Page: 732

View: 122

Visual Double Stars Formation Dynamics and Evolutionary TracksVisual Double Stars Formation Dynamics and Evolutionary Tracks

vi The Automatic Machine “Fantasy” Employment for the Measurements of the Stars with Dark Companions N.A. Shakht, E.V. Polyakov, V.B. Rafalsky 99 Une Nouvelle Méthode de Détermination des Elements de Position d'une Etoile Double ...

Author: J.A. Docobo

Publisher: Springer Science & Business Media

ISBN: 9789400914773


Page: 509

View: 155

This workshop is devoted to Double stars. The general topics of the meeting were: for mation, dynamics and evolutionary tracks. In accordance with the pure tradition of the Saint James way, "pilgrims" from all over the world come to meet together in Santiago. Although with a common interest (double stars), this meeting was a multidisciplinary one, since scientists with different backgrounds participated in it. As a matter of fact, we think that this is the first workshop jointly supported by IAU Commissions 7 (Celestial mechanics) and 26 (Double and multiple stars). It is our belief that this meeting will be the origin of a more close relations and common research. This meeting was held under the invitation of the University of Santiago de Compostela to commemorate its fifth centenary, and organized by the Astronomical Observatory named after its founder, Ramon M. Aller, who made significant contributions in the study of visual double stars, and was one of the pioneers who put the seeds of the present blossoming of Astronomy in Spain. The Scientific Organizing Committee was formed by Drs. C. Allen, P. Couteau, J. A. Docobo, R. Dvorak, A. Elipe, S. Ferraz-Mello (co-chairman), H.A.McAlister, M. Valtonen, C.Worley (chairman) and H. Zinnecker. The Local Organizing Committee was formed by Drs. J. A. Docobo (chairman), A.

Spectra of Bright Southern Stars Photographed with the 13 inch Boyden Telescope as a Part of the Henry Draper MemorialSpectra of Bright Southern Stars Photographed with the 13 inch Boyden Telescope as a Part of the Henry Draper Memorial

In the best photograph extremely faint dark companions of Hy and H8 corretaken with two prisms the line HB is invisible , and this sponds with that of the bright band . This object and is not due to faintness of the image .

Author: Annie Jump Cannon


ISBN: STANFORD:36105046458019


Page: 292

View: 304