0000000000787192

AUTHOR

S. J. Unger

showing 3 related works from this author

Infrared and optical observations of the newly identified Be/X-ray binary LSI + 61  235

1993

Observational (IR) and optical data are presented of the newly discovered Be/X-ray binary system LSI + 61° 235, taken over the period 1991 August – 1992 May. Though the IR shows little evidence for any changes, the optical Hα spectrum has undergone substantial modification. Combination of optical photometric measurements with the IR photometry allows the overall spectrum to be investigated and the existence of the Be star’s circumstellar disc to be directly confirmed.

Photometry (optics)PhysicsInfrared astronomy3D optical data storageSpace and Planetary ScienceInfraredBe starX-ray binaryAstronomyAstronomy and AstrophysicsEmission spectrumAstrophysicsSpectral lineMonthly Notices of the Royal Astronomical Society
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A phase change in X Persei

1991

We present a series of optical spectroscopic and infrared photometric observations of the Be/X-ray binary system X Per made over the last four years. Over this period the Hα line profile changed from emission to absorption, accompanied by a decrease in the infrared flux by over a magnitude and a flattening of the infrared spectrum. Such behaviour is consistent with the loss of the circumstellar disc or shell of material around the Be star and the reversion to a normal O/B-type star.

PhysicsAbsorption spectroscopyInfraredBe starAstrophysics::High Energy Astrophysical PhenomenaX-ray binaryAstronomyBalmer seriesAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicssymbols.namesakeApparent magnitudeSpace and Planetary SciencesymbolsAstrophysics::Solar and Stellar AstrophysicsH-alphaAstrophysics::Earth and Planetary AstrophysicsEmission spectrumAstrophysics::Galaxy AstrophysicsMonthly Notices of the Royal Astronomical Society
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Photometric and Hα Observations of LSI+61°303

1994

The Be massive X-ray binary LSI+61°303 is a 26.5 days periodic radiosource (Taylor & Gregory, 1984), exhibiting radio outbursts maxima between phases 0.6-0.8. Evidence of a photometric period of similar value has also been reported (Paredes & Figueras, 1986; Mendelson & Mazeh, 1989). The previous spectroscopic radial velocity observations of Hutchings & Crampton (1981) are in agreement with the radio period, and give support to the presence of a companion. We present new optical and infrared photometric observations and high resolution Hα spectra of LSI+61°303.

PhysicsRadial velocityInfraredHigh resolutionAstrophysicsMaximaSpectral line
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