Distances to Anomalous X-ray Pulsars using Red Clump Stars

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dc.creatorDurant, Martin
dc.creatorvan Kerkwijk, Marten H.
dc.date2006-06-01
dc.date.accessioned2026-07-07T10:39:09Z
dc.date.available2026-07-07T10:39:09Z
dc.descriptionWe identify `red clump stars' - core helium-burning giants - among 2MASS stars and use them to measure the run of reddening with distance in the direction of each of the Galactic Anomalous X-ray Pulsars (AXP). We combine this with extinction estimates from X-ray spectroscopy to infer distances and find that the locations of all AXP are consistent with being in Galactic spiral arms. We also find that the 2-10 keV luminosities implied by our distances are remarkably similar for all AXPs, being all around 1.3e35 erg s-1. Furthermore, using our distances to estimate effective black-body emitting radii, we find that the radii are tightly anti-correlated with pulsed fraction, and somewhat less tightly anti-correlated with black-body temperature. We find no obvious relationship of any property with the dipole magnetic field strength inferred from the spin-down rate.
dc.description38 pages aastex, 10 figures. Accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0606027
dc.identifierhttp://arxiv.org/abs/astro-ph/0606027
dc.identifierAstrophys.J.650:1070-1081,2006
dc.identifierdoi:10.1086/506380
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180931
dc.subjectAstrophysics
dc.titleDistances to Anomalous X-ray Pulsars using Red Clump Stars
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