| Issue |
A&A
Volume 446, Number 2, February I 2006
|
|
|---|---|---|
| Page(s) | 579 - 582 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20052912 | |
| Published online | 13 January 2006 | |
A continuous flaring- to normal-branch transition in Scorpius X-1
1
INAF – Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy e-mail: casella@merate.mi.astro.it
2
INAF – Osservatorio Astronomico di Roma, via di Frascati 33, 00040 Monte Porzio Catone (Roma), Italy
Received:
21
February
2005
Accepted:
8
June
2005
We report the first resolved rapid transition from a Flaring Branch Oscillation to a Normal Branch Oscillation in the RXTE data of the Z source Sco X-1. The transition took place on a time scale of ~100 s and was clearly associated to the Normal Branch-Flaring Branch vertex in the color–color diagram. We discuss the results in the context of possible association of the Normal Branch Oscillation with other oscillations known both in Neutron-Star and Black-Hole systems, concentrating on the similarities with the narrow 4–6 Hz oscillations observed at high flux in Black-Hole Candidates.
Key words: accretion, accretion disks / X-rays: binaries / stars: individual: Sco X-1
© ESO, 2006
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