2000A&A...361..121B


Query : 2000A&A...361..121B

2000A&A...361..121B - Astronomy and Astrophysics, volume 361, 121-138 (2000/9-1)

Low and high frequency quasi-periodic oscillations in 4U 1915-05.

BOIRIN L., BARRET D., OLIVE J.F., BLOSER P.F. and GRINDLAY J.E.

Abstract (from CDS):

The X-ray burster and dipper 4U 1915-05 (also known as XB 1916-053) was observed 19 times for a total exposure of roughly 140 ks between 1996 February and October with the proportional counter array (PCA) aboard Rossi X-ray Timing Explorer (RXTE). We present here the detailed timing study of its X-ray emission. The source was observed in both a high intensity/soft spectral and a low intensity/hard spectral state. The 2-20keV luminosities are about 1.4x1037 and 3.2x1036erg/s in the two regimes respectively (assuming a source distance of 9.3kpc). We confirm that 4U 1915-05 is an atoll source based on its spectral behaviour and its aperiodic variability in the frequency range ∼4x10–3-128Hz. 4U 1915-05 displays red noise below ∼1Hz, but is especially remarkable for its quasi-periodic variability detected for the first time at several timescales. We detect low frequency quasi-periodic oscillations (LFQPOs) between ∼5 and 80Hz, as well as high frequency QPOs (HFQPOs) between ∼200 and 1300Hz. Both LFQPOs and HFQPOs frequencies positively correlate with the mass accretion rate inferred from the position of the source on the color-color diagram. In a narrow range of luminosity, we also detect twin simultaneous HFQPOs separated by 348±12Hz.

Abstract Copyright:

Journal keyword(s): stars: individual: 4U 1915-05 - stars: neutron - X-rays: stars

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* V1055 Ori LXB 06 17 07.3565603963 +09 08 13.515857360   18.80 18.5     ~ 547 1
2 V* BR Cir HXB 15 20 40.85 -57 10 00.1   21.4 21.4     ~ 756 1
3 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 884 1
4 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1593 0
5 V* V801 Ara LXB 16 40 55.5976953528 -53 45 04.948107156 17.50 18.20 17.5   17.07 ~ 843 1
6 4U 1642-45 LXB 16 45 47.7 -45 36 40     14.30     ~ 401 1
7 V* V1101 Sco LXB 17 05 44.4916006152 -36 25 23.049324480   20.10 18.6     ~ 425 0
8 X Ara X-1 LXB 17 06 15.314 -43 02 08.69           ~ 258 1
9 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 379 0
10 INTREF 776 LXB 17 23 38.7 -37 39 42           ~ 28 0
11 4U 1722-30 LXB 17 27 33.25 -30 48 07.4     12.50     ~ 257 1
12 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 803 1
13 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 410 0
14 1ES 1735-26.9 LXB 17 38 17.12 -26 59 38.6           ~ 162 0
15 V* V926 Sco LXB 17 38 58.2384053021 -44 27 00.699118812 16.90 17.70 17.5     ~ 445 0
16 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 366 0
17 4U 1758-25 LXB 18 01 09.7308060816 -25 04 44.120221284     11.08     ~ 634 1
18 2S 1803-245 LXB 18 06 50.72 -24 35 28.6           ~ 72 0
19 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 946 0
20 V* V5512 Sgr LXB 18 14 31.55 -17 09 26.7     12.73     K5III 376 0
21 4U 1812-12 LXB 18 15 06.15 -12 05 46.7           ~ 110 2
22 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 624 2
23 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 965 1
24 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 326 0
25 X Aql X-1 LXB 19 11 16.0571313336 +00 35 05.868232692           ~ 1094 1
26 V* V1405 Aql LXB 19 18 47.871 -05 14 17.09 20.90 21.40 21.0     ~ 463 0
27 V* LZ Aqr LXB 21 23 14.54 -05 47 52.9 15.90 16.78 16.8     ~ 146 0
28 V* V1341 Cyg LXB 21 44 41.1544345272 +38 19 17.066570988 15.00 15.13 14.68 15.00   A9III 1116 1

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2023.01.30-05:19:51

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