0000000000377024

AUTHOR

M. J. Gorrod

showing 2 related works from this author

A rapid H? change in X Persei

1993

A trend of decreasing Hα emission over a period of thirty minutes is apparent in a series of spectra of X Persei taken on 31 December, 1987. This change appears to be astrophysical in origin and it indicates an anomalous state for X Persei that may be linked to its transition from a Be star to a normal B star, which occurred sometime between March 1988 and November 1990.

PhysicsX-ray astronomySpace and Planetary ScienceBe starStellar rotationAstronomyAstronomy and AstrophysicsH-alphaAstrophysicsEmission spectrumVariable starEquivalent widthMain sequenceAstrophysics and Space Science
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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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