Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.9103m&link_type=abstract
American Astronomical Society Meeting 207, #91.03; Bulletin of the American Astronomical Society, Vol. 37, p.1319
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the discovery of a slow (10.6 s) X-ray pulsar in the young (4±1 Myr) Galactic super star cluster Westerlund 1. The association between the star cluster and the pulsar is important, because we know the cluster contains a coeval population of stars, and that 35M&sun; O7 stars are still present on the main sequence. Therefore, we conclude that the progenitor to the neutron star had an initial mass of at least 40M&sun;. The progenitor had to have lost 95% of its mass either through stellar winds, binary mass transfer, or during the supernova. Moreover, the pulsar's slow spin period, soft X-ray spectrum, and lack of an infrared counterpart indicates that it is likely to be one of about a dozen magnetars. This is one of only a handful of model-independent constraints on the masses of progenitors to neutron stars, most of which imply that highly magnetized neutron star descend from >30M&sun; progenitors. This raises the question of whether magnetic fields play some role in driving the required mass loss.
Clark Simon J.
Crowther Paul A.
de Grijs Richard
Dougherty Sean M.
Law Colin Christian
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