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Wednesday, October 7, 2020 | History

3 edition of International ultraviolet explorer observations of Wolf-Rayet binaries found in the catalog.

International ultraviolet explorer observations of Wolf-Rayet binaries

Gloria Koenigsberger Avena

International ultraviolet explorer observations of Wolf-Rayet binaries

wind structures

by Gloria Koenigsberger Avena

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Published by Pennsylvania State University, Dept. of Astronomy, National Aeronautics and Space Administration in [State College, Pa.], [Washington, D.C .
Written in English

    Subjects:
  • IUE (Artificial satellite),
  • Wolf-Rayet stars -- Spectra.,
  • Ultraviolet spectra.,
  • Binary stars.,
  • Stellar spectra.,
  • Stellar winds.,
  • Ultraviolet astronomy.,
  • Wolf-Rayet stars.

  • Edition Notes

    Microfiche. [Washington, D.C. : National Aeronautics and Space Administration], 1984. 1 microfiche.

    Statementby Gloria Koenigsberger.
    SeriesNASA-CR -- 173253., NASA contractor report -- NASA CR-173253.
    ContributionsPennsylvania State University., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL16153593M

    a limited number of UV spectra of W-R stars collected with the International Ultraviolet Explorer (IUE) satellite was available. Equally important, IUE was the only UV spectroscopic mission at that time but did not have the sensitivity for high-S/N spectroscopy of galaxies. As a result, the technique of using the He II lines in W-R stars. tained with the International Ultraviolet Explorer (IUE) and Hubble Space Tele-scope (HST). At longer wavelengths, Infrared Space Observatory (ISO) observa-tions of WR stars have now been analysed. Much of the recent observational progress with Wolf-Rayet .

    One of the major results from the IUE may prove to be the new knowledge gained by studies of the ultraviolet spectra of symbiotic stars. Symbiotics combine spectral features of a cool M giant-like photosphere with strong high excitation emission lines of nebular origin, superposed. An excellent pre-UV review has been given by Swings (i). The UV spectra are dominated by intense permitted and.   Binary system Number of Number of IUE systems observations detached 87 contact 48 semidetached 44 unclassified i49 GS 34 RS 31 WR 7 WD 7 other GS - double stars with one or both giant and supergiant components RS - RS Canum Venaticorum-type stars WR -binaries with Wolf-Rayet star WD - systems with.

    The International Ultraviolet Explorer (IUE; also known as Explorer 57) was an astronomical observatory satellite primarily designed to take ultraviolet satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA).. IUE was first proposed in early , by a group of scientists in the United Kingdom, and was launched on. (Casares et al. ). Using observations in the ultraviolet from the International Ultraviolet Explorer (IUE) satellite, a handful of Be binaries with sdB or sdO companions were confirmed, in-cluding the well-known case of ’Per (Peters et al. , , ; Wang et al. , ). Several authors have studied the binary origin of Be.


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International ultraviolet explorer observations of Wolf-Rayet binaries by Gloria Koenigsberger Avena Download PDF EPUB FB2

Get this from a library. International ultraviolet explorer observations of Wolf-Rayet binaries: wind structures.

[Gloria Koenigsberger Avena; Pennsylvania State University.; United States. National Aeronautics and Space Administration.]. Abstract. At present we know that the Wolf-Rayet stars do not form a homogeneous group of objects with similar masses,but that their masses span a considerable r or not there is a correlation between the masses and the different subtypes of WR stars,can only be answered by more observations of WR stars in binarysystems yielding estimates of the masses of their by: 1.

Part of the International Astronomical Union/Union Astronomique Internationale book series (IAUS, volume 99) Abstract Each of four WR binaries has been observed in the keV range on four consecutive days for a total of ~ 10 4 sec with the IPC on the Einstein by: 6.

Spectra of six WN + OB Wolf-Rayet systems obtained with the IUE are analyzed for phase-dependent variations. Periodic variability at emission-line frequencies is detected in V Cyg, HDHDHD and HD on low dispersion SWP images. No changes in the low dispersion spectra of HD are apparent.

We find the variations in the UV to be similar in nature Author: G. Koenigsberger. Methods: We analyze over high resolution the International Ultraviolet Explorer spectra obtained between and and XMM-Newton observations obtained in The light curve and radial velocity (RV) variations were fit with the eccentric binary.

IUE (International Ultraviolet Explorer), geosynchronous Earth orbit This engineering mockup of IUE was photographed at the National Air and Space Museum, in Washington, D.C. The telescope points left, with the antennas at the back around the nozzle of the apogee motor.

Abstract. We report recent International Ultraviolet Explorer (IUE) observations of two interacting binaries, R Arae and HD The ultraviolet spectra indicate the presence of optically-thick, variable hot plasma in those binary systems.

The stars were not really studied at all in the ultraviolet until the launch of the International Ultraviolet Explorer Satellite (IUE), with the notable exceptions of photometric observations of. International Ultraviolet Explorer (IUE), astronomical research satellite built in the s as a cooperative project of the U.S.

National Aeronautics and Space Administration (NASA), the Science and Engineering Research Council of the United Kingdom, and. International Ultraviolet Explorer Atlas of O-type Spectra from to Å International Ultraviolet Explorer observations of Wolf-Rayet binaries: Wind structures.

September Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume ) Abstract We have tried to select as many single and SB1 type stars as possible in the Galaxy and the LMC to get the complete, flux-calibrated spectra between and Å.

2 Optical, Ultraviolet and Infrared Observations of X-ray Binaries Fig. Distribution of different HMXB populations High-mass X-ray binaries Supergiant and Be X-ray binaries There are two main sub-groups of HMXBS - the supergiant counterparts (normally of luminosity class I or II), and the Be/X-ray (or BeX) binary systems.

Here I report on work in progress on the orbital variations of the UV wind lines in a large sample of O-binaries that have been observed with the International Ultraviolet Explorer satellite. In most of these binaries, the blue absorption trough of the P-Cygni lines weakens when the strong wind component is behind its companion, in accordance.

FUSE Observations of the SMC 16 Day Wolf-Rayet Binary Sanduleak 1 (WO4+O4): Atmospheric Eclipses and Colliding Stellar Winds Nicole St-Louis et al.

The Astrophysical Journal IOPscience. UVBLUE: A New High-Resolution Theoretical Library of Ultraviolet Stellar Spectra L. Rodríguez-Merino et al. The Astrophysical Journal High resolution spectra of V Cygni have been obtained using the International Ultraviolet Explorer Satellite.

These spectra span both eclipses and include one observation at third quadrature. Together with seven archival spectra, they provide reasonably complete phase coverage for the system. The variations in the P Cygni profiles of the He(II) and N(IV) lines, imply the existence of a low.

International Ultraviolet Explorer (IUE) catalogues and results. models, etc., see subjects 48 to 57, and use those subjects for general texts embracing theory and observation.) Binaries and Multiple Stars.

General on multiple stars. Theory of orbits, reduction methods, hierachical systems. Wolf-Rayet. Using the Far Ultraviolet Spectroscopic Explorer satellite, we obtained series of spectra for two of the three known WC + O binaries in the LMC, Br 22, and Br 32 (HD ).

Based on data from the S2/68 sky survey experiment of the ERSO TD-1 satellite, the ultraviolet spectra of nine Wolf-Rayet (WR) stars are presented. The equivalent widths of emission lines present in WN and WC stars are given. The data are combined with ground-based observations and analyzed for continuum energy distributions and line strengths.

Context. EZ Canis Majoris is a classical Wolf-Rayet star whose binary nature has been debated for decades.

It was recently modeled as an eccentric binary with a periodic brightening at periastron of the emission originating in a shock heated zone near the companion. Aims: The focus of this paper is to further test the binary model and to constrain the nature of the unseen close companion by.

High resolution spectra of V Cygni have been obtained using the International Ultraviolet Explorer Satellite.

These spectra span both eclipses and include one observation at third quadrature. THE STRUCTURE OF WOLF-RAYET WINDS. II. OBSERVATIONS OF IONIZATION STRATIFICATION IN THE WN SUBTYPE single-lined spectroscopic binaries, which may have a less International Ultraviolet Explorer (IUE) data were taken from the archives of the National Space.Phase-resolved FUV observations of three Algol-type interacting binaries (V Sgr, TT Hya, and RY Per) have been made during totality with the Far Ultraviolet Spectroscopic Explorer to map the.The report highlights results obtained from the International Ultraviolet Explorer satellite, a project in which the UK was involved.

These include the observation of the UV spectra of nearly all primary bodies in the solar system; of a large sample of quasars, including the detection of faint high redshift objects; and of chromospheric effects over a wide range of late-type stars.