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Wednesday, July 22, 2020 | History

3 edition of Accretion disks in supersoft X-ray sources found in the catalog.

Accretion disks in supersoft X-ray sources

Accretion disks in supersoft X-ray sources

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • X ray sources.,
  • Accretion disks.,
  • White dwarf stars.,
  • Companion stars.,
  • Stellar spectra.

  • Edition Notes

    StatementRobert Popham, Rosanne DiStefano.
    Series[NASA contractor report] -- NASA-CR-203429., NASA contractor report -- NASA CR-203429.
    ContributionsDiStefano, Rosanne., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15543387M

    Mar 19,  · Accretion Rates. The Hubble Space Telescope imaged the region of the sky where fe was later found a few years prior to the explosion. The images were taken in a narrow filter to observe He II emission (singly ionized helium). For the single degenerate model, if the white dwarf is accreting mass at a high enough rate, it will become an x-ray. with systematic decrease in both the X-ray luminosity (from 7X10^42 erg/s to 4X10^41 erg/s) and the characteristic temperature (from keV to keV). The X-ray outburst was associated with an optical flare, which suggested that the event started before We discuss various explanations for both sources and find that they are best.

    Supersoft X-ray Stars and Supernovae by Peter Kahabka, Edward P. J. van den Heuvel and Saul A. Rappaport Supersoft sources–which spew unusually low–energy x-rays-are now thought to be white dwarf stars that siphon matter from their stellar companions and then, in many cases, explode. X-rays are the hallmark of electric discharges. GALEX Conference Publications Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. , Proceedings of the conference held October, at the Centro Convegni Matteo Ricci, Rome, Italy. Edited by Jos? Supersoft X-ray Sources in the GALEX Images of M

    ↑ Proceedings of the Workshop on Supersoft X-ray Sources held at the Max Planck Institute for Extraterrestrial Physics ↑ Catalog of Supersoft X-ray Sources. ↑ E.P.J. van den Heuvel, D. Bhattacharya, K. Nomoto, and S.A. Rappaport (August ). "Accreting white dwarf models for CAL 83, CAL 87 and other ultrasoft X-ray sources in the LMC". The X-ray dips are certainly caused by 'raised rims' in the accretion disk. While there are diferences (NS vs. WD, a very small X-ray source near the NS versus a larger optical source from the inner edge of the disk), the similarities are close and striking. So the X-ray dips provide a .


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Accretion disks in supersoft X-ray sources Download PDF EPUB FB2

A luminous supersoft X-ray source (SSXS, or SSS) is an astronomical source that emits only low energy (i.e., soft) universityofthephoenix.com X-rays have energies in the to keV range, whereas hard X-rays are in the 1–20 keV range. SSSs emit few or no photons with energies above 1 keV, and most have effective temperatures below eV.

We report the discovery of a transient jet in the supersoft X-ray source RX J The jet was observed in the Halpha line during a single night in June and had disappeared one day later.

Observations with X-ray satellite ROSAT over the past 5 years have established supersoft X-ray sources as a new class of objects in our Galaxy and Accretion disks in supersoft X-ray sources book.

Optical follow-up observations have revealed the binary nature of several of them. Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied.

Accretion disks in supersoft X-ray sources Robert Popham Read. Read. Low-frequency QPO in the X-ray transient GRO J Read.

Publishing History This is a chart to show the publishing history of editions of works about this subject. Along the X axis is time, and on the y axis is the count of editions published.1 book Alan Stern. Thus, in contrast to standard accretion disks, the main role of the disk is to reprocess the radiation from the white dwarf.

We calculate models of accretion disks around luminous white dwards and compare the resulting disk fluxes to optical and UV observations of the LMC supersoft sources CAL 83, CAL 87, and RX JCited by: The prototype supersoft x‐ray source (SSS) is the well‐known x‐ray binary CAL83 in the LMC, which has an orbital period of d.

jets are produced at the center of accretion disks, and. The nature of the supersoft X-ray source RX J [K A Southwell; United States. Book Microform: National government publication: Microfiche: English: Rating: X ray sources.

Accretion disks. X ray binaries. X ray astronomy. Bursts. Confirm this request. You may have already requested this item. Please select Ok if you would like. Highlights in X-ray astronomy.

Symposium Proceedings. Authors: Aschenbach, B Bibliographic Code: universityofthephoenix.com.A: Abstract The following topics were dealt with: X-ray binaries, pulsars, neutron stars, stellar magnetic fields, cyclotron lines, luminous supersoft X-ray sources, microquasars, quasars, accretion disks, Galactic Centre.

Ultraluminous supersoft X-ray sources (ULSs) exhibit supersoft X-ray spectra with blackbody temperatures below keV and bolometric luminosities above 10{sup 39} ergs s{sup −1}. In this Letter, we report the first optical spectroscopic observations of a ULS in M81 using the LRIS spectrograph on the Keck I telescope.

Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays. There are a number of types of astrophysical objects which emit X-rays, from galaxy clusters, through black holes in active galactic nuclei (AGN) to galactic objects such as supernova remnants, stars, and binary stars containing a white dwarf (cataclysmic variable stars and.

Observations with X-ray satellite ROSAT over the past 5 years have established supersoft X-ray sources as a new class of objects in our Galaxy and beyond. Optical follow-up observations have revealed the binary nature of several of them. Recent population synthesis calculations have shown that the.

Dec 25,  · Accretion disks play the dominant role in various active phenomena in the universe; i.e., in protoplanetary nebulae around young stellar objects, cataclysmic variables and supersoft X-ray sources, microquasars and galactic X-ray binaries, ultraluminous X-ray sources, quasars and active galaxies, gamma-ray bursts, and so universityofthephoenix.com by: Sep 10,  · When it comes to the brightest sources of X-rays, the objects we observe usually fall into two camps: Active galactic nuclei (AGN) which result from the super-massive black holes in the centers of galaxies, and much-smaller X-ray binaries, which may be normal-sized black holes, white dwarfs, neutron stars or other compact objects with companion stars.

Accretion Power in Astrophysics examines accretion as a source of energy in both binary star systems containing compact objects, and in active galactic nuclei.

Assuming a basic knowledge of physics, the authors describe the physical processes at work in accretion discs and other accretion universityofthephoenix.com by: 4. In the optical low state there is X-ray emission below keV. On the basis of the observed correlation between the optical and X-ray behaviour of V Sge and V Cyg (and possibly other systems), he concluded that VY Scl stars are an extension of the canonical supersoft X-ray sources.

@article{osti_, title = {Pulsator-like Spectra from Ultraluminous X-Ray Sources and the Search for More Ultraluminous Pulsars}, author = {Pintore, F.

and Mereghetti, S. and Zampieri, L. and Stella, L. and Israel, G. and Wolter, A.}, abstractNote = {Ultraluminous X-ray sources (ULXs) are a population of extragalactic objects whose luminosity exceeds the Eddington limit for a 10 M Cited by: Unfortunately, this book can't be printed from the OpenBook.

If you need to print pages from this book, we recommend downloading it as a PDF. Visit universityofthephoenix.com to get more information about this book, to buy it in print, or to download it as a free PDF.

compact stellar x-ray sources in normal galaxies. Although there is clear evidence pointing towards an XRB nature for ULXs, the presence of IMBHs in these systems is by no means universally accepted, and it may be quite possible that ULXs are indeed a heterogeneous population.

Angular Momentum Transport in Accretion Disks. Pages Livio, Mario. Supersoft X-Ray Sources in the LMC and SMC. Pages Kahabka, P. Book Title Cataclysmic Variables Book Subtitle Proceedings of the Conference held in Abano Terme, Italy, 20–24 June Editors.

Timing supersoft X-ray sources with NICER. Intriguing modulation of supersoft X-ray flux on timescales clustering either around half an hour or 1 minute have been discovered in white dwarfs that are burning hydrogen in an accreted shell, either after a nova outburst.

THE X-RAY UNIVERSE 27 - 30 May Granada, Spain the XMM-Newton Science Operations Centre, European Space Astronomy Centre (ESAC), European Space Agency (ESA) ABSTRACT BOOK Oral Communications and Posters Edited by M. DIAZ TRIGO & M.

EHLE with the help of Accretion in Galactic X-ray sources and AGN: constraints from X-ray.Ultraluminous X-ray sources Time resolved X-ray spectral analysis during optical dips and accretion bursts in stars with disks of NGC from Chandra/ACIS-I and CoRoT data Mario Giuseppe Guarcello, Ettore Flaccomio, Giuseppina Micela, Costanza Ar- Multi-wavelength properties of two supersoft X-ray sources CAL83 and RXJ