SPECTROSCOPY OF THE COMPANION AND BOW-SHOCK NEBULA OF PSR 1957 + 20

被引：27

作者：

ALDCROFT, TL ^{[1
]}

ROMANI, RW ^{[1
]}

CORDES, JM ^{[1
]}

机构：

[1] CORNELL UNIV,DEPT ASTRON,ITHACA,NY 14853

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 400卷 / 02期

关键词：

BINARIES; CLOSE; ECLIPSING; PULSARS; INDIVIDUAL; (PSR; 1957; 20); SHOCK WAVES;

D O I：

10.1086/172025

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 also 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.

引用

页码：638 / 646

页数：9

共 22 条

[1]

BANBUREN D, 1992, PREPRINT

[2]

Baranov V. B., 1971, Soviet Physics - Doklady, V15, P791

[3] PHOTOMETRY AND THE LIGHT-CURVE OF THE OPTICAL COUNTERPART OF THE ECLIPSING MILLISECOND PULSAR 1957+20 [J].