The Discovery of 8.9 Second Pulsations from the Variable X-Ray Source 2E 0050.1−7247 in the Small Magellanic Cloud | Zendy

G. L. Israel | Zendy; L. Stella | Zendy; L. Angelini | Zendy; N. E. White | Zendy; P. Giommi | Zendy; S. Covino | Zendy

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The Discovery of 8.9 Second Pulsations from the Variable X-Ray Source 2E 0050.1−7247 in the Small Magellanic Cloud

Author(s) -

G. L. Israel,

L. Stella,

L. Angelini,

N. E. White,

P. Giommi,

S. Covino

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310779

Subject(s) - rosat , astrophysics , physics , pulsar , luminosity , large magellanic cloud , small magellanic cloud , light curve , neutron star , x ray , astronomy , stars , optics , galaxy

During a systematic search for periodic signals in a sample of ROSAT PSPClight curves, we discovered ~ 8.9s X-ray pulsations in 2E0050.1-7247, avariable X-ray source in the Small Magellanic Cloud. The source was detectedseveral times between 1979 and 1993 at luminosity levels ranging from about 5times 10^{34} erg/s up to 1.4 times 10^{36} erg/s with both the Einstein IPCand ROSAT PSPC. The X-ray energy spectrum is consistent with a power lawspectrum which steepens as the source luminosity decreases. We revealed apronounced Halpha activity from at least two B stars in the X-ray errorcircles. These results strongly suggest that the X-ray pulsar 2E0050.1-7247 isin a Be-type massive binary.Comment: 13 pages plus 3 postscript figures, AAS style LaTeX file Accepted for publication in the Astrophysical Journal Letter

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