2013/06/28 by La Palombara, La Palombara, N., S. Mereghetti +9
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Astrophysical Phenomena and Observations #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High-pressure geophysics and materials #Mechanics and Biomechanics Studies
paper · pdf · doi:10.48550/arxiv.1306.6867
openalex publication_date 2013/06/28 · openalex created_date 2019/12/26 · openalex updated_date 2026/07/28
We report on the main results obtained thanks to an observation campaign with XMM-Newton of four persistent, low-luminosity (Lx ~ 1034 erg/s) and long-period (P > 200 s) Be accreting pulsars. We found that all sources considered here are characterized by a spectral excess that can be described with a blackbody component of high temperature (kTbb > 1 keV) and small area (Rbb < 0.5 km). We show that: 1) this feature is a common property of several low-luminosity X-ray binaries; 2) for most sources the blackbody parameters (radius and temperature) are within a narrow range of values; 3) it can be interpreted as emission from the NS polar caps.