Query : 2018A&A...612A..33M

2018A&A...612A..33M - Astronomy and Astrophysics, volume 612A, 33-33 (2018/4-1)

Energy scaling of the "heartbeat" pulse width of GRS 1915+105, IGR J17091-3624, and MXB 1730-335 from Rossi-XTE observations.


Abstract (from CDS):

We investigate some key aspects of the "heartbeat" variability consisting of series of bursts with a slow rise and a fast decay, thus far detected only in GRS 1915+105, IGR J17091-3624, and MXB 1730-335. A previous analysis based on BeppoSAX data of GRS 1915+105 revealed a hard-X delay (HXD), that is a lag of the burst rise at higher energies with respect to lower ones; this leads to narrower pulse widths, w, at higher energies. We here use some light curves of Rossi-XTE observations of GRS 1915+105 for a deeper analysis of this effect and search for its presence in those extracted from some IGR J17091-3624 and MXB 1730-335 observations performed with the same satellite. Our results show that, at variance with GRS 1915+105, no HXD is evident in the light curves of MXB 1730-335 and only a marginal HXD may be argued for IGR J17091-3624. For GRS 1915+105 we find a decreasing trend of the pulse width with energy following a power law w=dA/dtE–s with an index s~=0.8. Furthermore, we confirm the increase of the HXD with the recurrence time Trec of the bursts in each series that was already found in previous works using BeppoSAX data. Based on a spectral analysis of these three sources we conclude that the differences highlighted in the properties of the "heartbeat" variability are probably related to the different accreting compact object and the eventual presence of a corona in these binary interacting systems.

Abstract Copyright: © ESO 2018

Journal keyword(s): binaries: close - X-rays: stars - X-rays: individuals: GRS 1915+105 - X-rays: individuals: IGR J17091-3624 - X-rays: individuals: MXB 1730-335

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 [KRL2007b] 222 LXB 17 09 07.61 -36 24 25.7           ~ 282 1
2 [KRL2007b] 224 HX? 17 09 46.124 -36 27 57.31   21.16       ~ 48 0
3 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 823 1
4 NAME Rapid Burster LXB 17 33 24.61 -33 23 19.8           ~ 414 2
5 IGR J17354-3255 HXB 17 35 27.6058982616 -32 55 54.425912052           O9Iab 52 1
6 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2626 0

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