Spectroscopy of the companion and bow-shock nebula of PSR 1957 + 20

Details Spectroscopy of the companion and bow-shock nebula of PSR 1957 + 20 Spectroscopy of the companion and bow-shock nebula of PSR 1957 + 20

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..638a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 2, p. 638-646.

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26

Bow Waves, Companion Stars, Eclipsing Binary Stars, Nebulae, Shock Wave Profiles, Stellar Spectra, Astronomical Models, Kinematic Equations, Pulsars

Scientific paper

We have obtained moderate-resolution spectra of the bow-shock nebula and companion of the eclipsing binary pulsar PSR 1957 + 20. These data give us a measurement of the nebular Balmer decrement and emission-line strengths and establish that the emission is due to a nonradiative shock. We have developed a computational model of the nebular emission that we fitted to the observed spectra to obtain a kinematic estimate of the system distance and the local ISM conditions. We have isolated the spectrum of the pulsar companion and follow its variation with the orbit. A lack of strong emission lines poses further problems for companion ablation with rapid thermally driven wind; the approximately 1.2 kpc distance indicated by our analysis suggests instead that the companion is bloated to near Roche-lobe contact.

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