Computer Science
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.361...47l&link_type=abstract
Nature (ISSN 0028-0836), vol. 361, no. 6407, p. 47-49.
Computer Science
61
Eclipsing Binary Stars, Globular Clusters, Pulsars, Radio Waves, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Mass Ejection, Stellar Systems
Scientific paper
Pulsars that are members of binary systems in globular clusters are all rapidly rotating, and it is assumed that they have been spun up by accretion from binary companions. Here we report an exception: PSR 1718-19, in the globular cluster NGC 6342, is in a 6.2-hour eclipsing binary system, but has the relatively long period of 1s. Its magnetic field is strong, about 10 exp 12 G, and its spindown age is small, about 10 Myr. Furthermore, the mass of its companion is only 0.1-0.2 solar masses. The eclipses show that the binary system is embedded in a cloud of material which must have been ejected from the companion star, although calculations suggest that the companion is well inside its Roche lobe. The pulsar's radiation may be causing expulsion of material beyond the Roche lobe, as in the ablating binary systems containing PSR-1744-24A and PSR1957 + 20, even though the incident flux at the companion is orders of magnitude smaller than in these cases.
Bailes Matthew
Biggs Jason D.
Harrison A. P.
Lyne Andrew G.
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