| Autor: |
Champion DJ; Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada. David.Champion@atnf.csiro.au, Ransom SM, Lazarus P, Camilo F, Bassa C, Kaspi VM, Nice DJ, Freire PC, Stairs IH, van Leeuwen J, Stappers BW, Cordes JM, Hessels JW, Lorimer DR, Arzoumanian Z, Backer DC, Bhat ND, Chatterjee S, Cognard I, Deneva JS, Faucher-Giguère CA, Gaensler BM, Han J, Jenet FA, Kasian L, Kondratiev VI, Kramer M, Lazio J, McLaughlin MA, Venkataraman A, Vlemmings W |
| Jazyk: |
angličtina |
| Zdroj: |
Science (New York, N.Y.) [Science] 2008 Jun 06; Vol. 320 (5881), pp. 1309-12. Date of Electronic Publication: 2008 May 15. |
| DOI: |
10.1126/science.1157580 |
| Abstrakt: |
Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+0327, a radio pulsar with a rotational period of 2.15 milliseconds in a highly eccentric (e = 0.44) 95-day orbit around a solar mass (M(middle dot in circle)) companion. Infrared observations identify a possible main-sequence companion star. Conventional binary stellar evolution models predict neither large orbital eccentricities nor main-sequence companions around millisecond pulsars. Alternative formation scenarios involve recycling a neutron star in a globular cluster, then ejecting it into the Galactic disk, or membership in a hierarchical triple system. A relativistic analysis of timing observations of the pulsar finds its mass to be 1.74 +/- 0.04 M solar symbol, an unusually high value. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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