| タイトル | Spectroscopy of the companion and bow-shock nebula of PSR 1957 + 20 |
| 著者（英） | Cordes, James M.; Aldcroft, Thomas L.; Romani, Roger W. |
| 著者所属（英） | NASA Headquarters |
| 発行日 | 1992-12-01 |
| 言語 | eng |
| 内容記述 | 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. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 93A16446 |
| 権利 | Copyright |
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