6533b871fe1ef96bd12d1bf9
RESEARCH PRODUCT
Comparison of the H-alpha circumstellar disks in Be/X-ray binaries and Be stars
N. A. TomovJosep MartíR. K. ZamanovPablo ReigM. J. CoeJuan FabregatT. Valchevsubject
Astrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsCompact starRotationUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysicsEmissionX-raysAstrophysics::Solar and Stellar AstrophysicsEmission spectrumAstrophysics::Galaxy AstrophysicsLine (formation)PhysicsBinariesAstrophysics (astro-ph)X-rayAstronomy and AstrophysicsCircumstellar matterStars:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]StarsFull width at half maximumStars ; Emission ; Be star ; Circumstellar matter ; Binaries ; X-raysSpace and Planetary ScienceBe starH-alphaAstrophysics::Earth and Planetary AstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]description
We present a comparative study of the circumstellar disks in Be/X-ray binaries and isolated Be stars based upon the H-alpha emission line. From this comparison it follows that the overall structure of the disks in the Be/X-ray binaries is similar to the disks of other Be stars, i.e. they are axisymmetric and rotationally supported. The factors for the line broadening (rotation and temperature) in the disks of the Be stars and the Be/X-ray binaries seem to be identical. However, we do detect some intriguing differences between the envelopes. On average, the circumstellar disks of the Be/X-ray binaries are twice as dense as the disks of the isolated Be stars. The different distribution of the Be/X-ray binaries and the Be stars seen in the full width at half maximum (FWHM) versus peak separation diagram indicates that the disks in Be/X-ray binaries have on average a smaller size, probably truncated by the compact object.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-12-16 |