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PYCNONUCLEAR REACTIONS in dense stellar matter

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Soft X-ray X<br />

transients<br />

• Active states: L X<br />

= 10 36 -10 39 erg/s<br />

weeks – months – years; X-ray bursts<br />

• Quiescent states: L X = 10 30 –10 34 ergs/s<br />

years - decades<br />

• SXRTs belong to LMXRBs<br />

Donor star: ma<strong>in</strong>-sequence or<br />

subgiant, M ≤ M SUN<br />

• P ORB : a few hours – a few days<br />

• ‹M› ≈ 10 -11 –10 -9 M SUN /yr<br />

.<br />

Brown, Bildsten & Rutledge (1998):<br />

Aql X-1 T S ~ 10 6 K

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