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3 edition of Studies of an X-ray selected sample of cataclysmic variables found in the catalog.

Studies of an X-ray selected sample of cataclysmic variables

Studies of an X-ray selected sample of cataclysmic variables

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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, Galactic.

  • Edition Notes

    Statementby Andrew D. Silber.
    Series[NASA contractor report] -- NASA CR-194773., NASA contractor report -- NASA CR-194773.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14702233M

    The X-ray, UV, and optical radiation is pulsed at the spin period of the white dwarf (P spin) and the beat period between the spin and orbital periods is P beat = (1/P spin – 1/P orb) –1. [ Cataclysmic Variables (CVs)] [ Classical Novae] [ CV Sub-types] [ Non-magnetic CVs]. This timely volume provides the first comprehensive survey of cataclysmic variable stars, integrating theory and observation into a single, synthesised text. An introductory chapter gives the historical background of studies of cataclysmic by:

    Cataclysmic Variables (CVs) are binary star systems in which a white dwarf accretes matter studies,incontrasthavefoundPmin orb ≈82min[Gänsickeetal.,;Woudtetal.,]. and cadence, colour or variability selection criteria, and x-ray luminosity, are just a few of the criteria that bias the known population of CVs. Larger samples of. This site supported in part by National Science Foundation grant AST to J. Patterson.

    "Cataclysmic Variable Stars: How and Why They Vary" by Coel Hellier is one of those rare books that successfully toes the line between being a scientific and a popular book. This book is so popular with AAVSO HQ staff that it frequently is taken home and has to be tracked down when someone needs it!Cited by:   We are interested in possible high-energy processes in the intermediate polar cataclysmic variables (IPCVs), since these objects have been recently established by the INTEGRAL as a class of the hard X-ray sources with evidences of non-thermal components (e.g. Barlow et al. ; Revnivtsev et al. ). This X-ray emission can be described Cited by: 8.


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Studies of an X-ray selected sample of cataclysmic variables Download PDF EPUB FB2

Get this from a library. Studies of an X-ray selected sample of cataclysmic variables. [Andrew D Silber; United States. National Aeronautics and Space Administration.]. This sample includes 43 Cataclysmic Variables (CVs), which are binaries consisting of a detached white-dwarf and a Roche lobe filling companion star.

This thesis consists of studies of the X-ray selected sample of CVs. This thesis consists of 4 parts: (1) by: 1. This sample includes 43 cataclysmic variables, which are binaries consisting of a detached white-dwarf and a Roche lobe filling companion star. This thesis consists of studies of the x-ray selected sample of catalcysmic variablesAuthor: Andrew D.

Silber. By studying Swift X-ray spectra of an optically-selected, non-magnetic sample of nearby cataclysmic variables (CVs), we show that there is a population with. Cataclysmic variables (CVs) are accreting binaries in which a late-type, usually dwarf star, donates mass via Roche-lobe overflow to a white dwarf (WD).

In X-ray surveys, the occurrence of different classes of CVs is correlated with the magnetic properties of the by: @article{osti_, title = {OPTICAL STUDIES OF 13 HARD X-RAY SELECTED CATACLYSMIC BINARIES FROM THE SWIFT-BAT SURVEY}, author = {Halpern, Jules P.

and Thorstensen, John R.}, abstractNote = {From a set of 13 cataclysmic binaries that were discovered in the Swift Burst Alert Telescope (BAT) survey, we conducted time-resolved optical spectroscopy and/or time-series.

Multiwavelength studies of X-ray selected extragalactic sample. cataclysmic variable 26 11 35 AFG star 45 K star Among hard X-ray Galactic sources detected with the Swift and INTEGRAL surveys, those discovered as accreting white dwarf binaries have surprisingly boosted in number in the recent years.

The majority are identified as magnetic Cataclysmic Variables of the Intermediate Polar type, suggesting this subclass as an important constituent of the Galactic population of X-ray : D. de Martino, F. Bernardini, K. Mukai, K.

Mukai, M. Falanga, N. Masetti. Cataclysmic variables (CVs) are interacting binaries in which the accreting object (the primary) is a white dwarf (see Warner for a review).

X-ray emission in CVs is most likely associated with the accretion process, which is capable of shock-heating accreted ma- terial up to high temperatures (IcTmax w keV).

Their accretion geometry Cited by: secondary provide an excellent laboratory to study accretion up close, and in a mostly non-Relativistic (i.e., simple) regime. The X-ray Emission of Magnetic Cataclysmic Variables – p. 11/ The X-ray Emission of Magnetic Cataclysmic Variables – p.

21/ The space density of the various classes of cataclysmic variables (CVs) could only be weakly constrained in the past. Reasons were the small number of objects in complete X-ray flux-limited samples and the difficulty to derive precise distances to CVs.

The former limitation still exists. Here the impact of Gaia parallaxes and implied distances on the space density of X-ray selected complete Cited by: 5. A sample of cataclysmic variables (CVs) detected among the X-ray sources of the square degree (d) survey performed based on ROSAT pointings is presented.

A technique for selecting CVs among the X-ray sources using additional optical and infrared data, based on Sloan Digital Sky Survey andWISE data, is by: 3. Cataclysmic Variables •Modest increase in INTEGRAL sample size since SR08 –~40% increase + better multi-λ IDs –Still predominantly IPs, L x ~ ergs/s •Improvement in population study –Revnivtsev et al.

~_ ergs/s/M O –Contributions to Galactic ridge better quantified •Scale height, luminosity function. Abstract. Hard X-ray surveys have proven remarkably efficient in detecting intermediate polars and asynchronous polars, two of the rarest type of cataclysmic vCited by: Aizu, K.

() X-ray Emission Region of a White Dwarf with Accretion, t. Phys.,49, pp. – ADS CrossRef Google ScholarCited by: 3. Hard X-ray surveys have proven remarkably efficient in detecting intermediate polars and asynchronous polars, two of the rarest type of cataclysmic variable (CV).

Here, we present a global study of hard X-ray-selected intermediate polars and asynchronous polars, focusing particularly on the link between hard X-ray properties and spin/orbital periods.

Einstein X-ray observations of cataclysmic variables. There may be unrecognised selection effects that have biased the selection of nova targets for Einstein so that there is an unrepresentative mix of X—ray bright and X—ray faint classical nova in the sample.

The mean X—ray luminosity of these stars could thus be lover than stated Author: Keith O. Mason. A short introduction to the types of Cataclysmic Variables (CVs) is followed by a presentation of some of the properties of the two types of MCVs - Polars and Intermediate Polars (IPs) as seen in.

The X-ray properties of cataclysmic variables S¸. Balman Middle East Technical University, Department of Physics, Inonu Bulvarı, Ankara,Turkey, e-mail: [email protected] Abstract.

Cataclysmic Variables (CVs) are a distinct class of X-ray binaries transfering mass from a donar star to a compact star accretor, a white dwarf.

• A lurking variable is a variable not accounted for by the researcher • These variables may or may not contaminate the results of the study • A lurking variable that interacts with the IV and DV is known as a confounding variable • Confounding variables are those unaccounted variables that the researcher mistakenly associates an.

We present time-series photometry of nine cataclysmic variables: EI UMa, VHer, V Cyg, V Cyg, GZ Cnc, TY Psc, V Aql, ASAS J+, V Aql and LN UMa.

The observations were conducted at various observatories, covering hours and comprising 7, data points in total. For the majority of targets we confirm previously reported periodicities and for Cited by: 1.(Chapter 4).

Table presents values of x-ray attenu-ation on unenhanced cranial CT. The slightly higher attenuation of the gray matter of the brain compared with white matter may be a result of both a lower gray matter water content and a higher blood volume.1 Recall that on the Hounsfi eld scale zero refers to pure water; the value ofFile Size: 1MB.of Bulge X-rays sources in these fields have indicated that the hard X-ray emission is dominated by low luminosity (LX.

−33 erg s−1) hard X-ray sources and that their major candidates are likely magnetic cataclysmic variables (MCVs) (Laycock et al.M09, H09b). The LW is one of the low extinction Bulge fields, and the first deep.