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Supergiant, fast, but not so transient 4U 1907+09

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arxiv 1210.4428 v1 pith:ABZOQCWA submitted 2012-10-16 astro-ph.HE

V. Doroshenko , A. Santangelo , L. Ducci , D. Klochkov This is my paper · ORCID
classification astro-ph.HE
keywords fastsfxtssupergiantx-rayaccretingaccretionactivitybehavior
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We have investigated the dipping activity observed in the high-mass X-ray binary 4U 1907+09 and shown that the source continues to pulsate in the "off" state, noting that the transition between the "on" and "off" states may be either dip-like or flare-like. This behavior may be explained in the framework of the "gated accretion" scenario proposed to explain the flares in supergiant fast X-ray transients (SFXTs). We conclude that 4U 1907+09 might prove to be a missing link between the SFXTs and ordinary accreting pulsars.

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  1. Why do massive stars form bow shocks? Bulk ISM motion as the main driver of bow shock formation and geometry

    astro-ph.SR 2026-08 conditional novelty 6.0 of 10

    Bulk interstellar gas motion, not stellar motion, dominates most massive star bow shocks; only about 21% are classical aligned bow shocks.

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