2003A&A...402.1021F


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.08CEST01:03:25

2003A&A...402.1021F - Astronomy and Astrophysics, volume 402, 1021-1032 (2003/5-2)

BeppoSAX observations of two unclassified LMXBs: X1543-624 and X1556-605.

FARINELLI R., FRONTERA F., MASETTI N., AMATI L., GUIDORZI C., ORLANDINI M., PALAZZI E., PARMAR A.N., STELLA L., VAN DER KLIS M. and ZHANG S.N.

Abstract (from CDS):

Observations of two unclassified Low Mass X-ray Binaries, X1543-624 and X1556-605, are presented. In the 2-10keV band the first of the two sources is a factor of two stronger than the other. Both sources do not show X-ray bursts, dips or eclipses in their X-ray light curves. We find that both spectra are described by a two-component model consisting of emission from a cool accretion disk plus a Comptonized blackbody with kTbb∼1.5keV in a low opacity plasma. The spectrum of X1543-624 hardens from the first to the second observation, when the source slowly moves from right to left in the colour-colour diagram. The spectrum of X1556-605 can also be described by a model consisting of a blackbody plus an unsaturated Comptonization with electron energy kTe∼4keV. In the first observation, X1543-624 shows evidence of a Fe K emission line at 6.4keV. Moreover, in both observations, the source spectrum exhibits an emission feature around 0.7keV, which is interpreted as due to the superposition of the K edge absorption features of O and Ne elements with uncommon relative abundances with respect to the solar one (O/O∼0.3, Ne/Ne∼2.5). In the spectrum of X1556-605 no emission lines are observed. We discuss these results and their implications for the source classification and the accretion geometry of the compact object.

Abstract Copyright:

Journal keyword(s): stars: individual: X1543-624, X1556-605 - X-rays: general - X-rays: stars - stars: neutron - accretion, disks accretion

CDS comments: Fig.9: Objects 1 to 17 not identified.

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V1055 Ori LXB 06 17 07.3 +09 08 13   18.80 18.5     ~ 508 1
2 4U 0919-54 LXB 09 20 26.4814865475 -55 12 24.507988707 20.40 21.30 21.0     ~ 144 0
3 V* MM Vel HXB 10 13 36.4107940553 -45 04 32.555813596   14.84 14.71     G5V-M0V 183 0
4 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 724 0
5 V* GU Mus HXB 11 26 26.5947467816 -68 40 32.888148788           K3V-K7V 670 1
6 M 89 LIN 12 35 39.8 +12 33 23 11.29 10.73 9.75     ~ 925 2
7 4U 1323-62 LXB 13 26 36.31 -62 08 09.9           ~ 162 0
8 V* V822 Cen LXB 14 58 21.9350279092 -31 40 07.515505032 11.95 12.85 12.8     K3-K7V 508 0
9 V* BR Cir HXB 15 20 40.85 -57 10 00.1   21.4 21.4     ~ 723 1
10 V* QU TrA LXB 15 47 54.6 -62 34 06           ~ 128 0
11 V* LU TrA LXB 16 01 02.3 -60 44 18 18.35 19.05 18.6     ~ 79 0
12 V* QX Nor LXB 16 12 43.0 -52 25 23           ~ 830 1
13 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1527 0
14 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1705 1
15 V* V1101 Sco LXB 17 05 44.4915929414 -36 25 23.049863107   20.10 18.6     ~ 406 0
16 V* V2107 Oph HXB 17 08 14.520 -25 05 30.15   16.50 15.9     K3V-K7V 211 1
17 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 356 0
18 4U 1711-34 LXB 17 14 19.78 -34 02 47.3           ~ 42 0
19 4U 1722-30 LXB 17 27 33.25 -30 48 07.4           ~ 234 1
20 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5           ~ 760 1
21 KS 1731-260 LXB 17 34 13.46 -26 05 18.6       22.8 20.9 ~ 394 0
22 1RXS J173546.9-302859 LXB 17 35 46.88 -30 29 00.4           ~ 66 1
23 1ES 1735-26.9 LXB 17 38 17.12 -26 59 38.6           ~ 149 0
24 2E 1737.5-2817 LXB 17 40 42.84 -28 18 08.5           ~ 71 0
25 2E 3943 LXB 17 46 05.20 -29 30 53.3           ~ 189 1
26 [PLV2002] CX1 LXB 17 48 52.163 -20 21 32.40           ~ 164 1
27 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 874 0
28 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 598 2
29 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 902 1
30 V* V4634 Sgr LXB 18 29 28.2 -23 47 49 18.90 19.40 19     ~ 288 0
31 4U 1850-086 LXB 18 53 04.89 -08 42 19.7 20.40 21.20 21.0     ~ 230 1
32 X Aql X-1 LXB 19 11 16.0572031521 +00 35 05.876658556           ~ 1013 1
33 V* V1405 Aql LXB 19 18 47.871 -05 14 17.09 20.90 21.40 21.0     ~ 438 0
34 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3934 0
35 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1095 0
36 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.13 14.68 15.00   A9III 1071 1

    Equat.    Gal    SGal    Ecl

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2020.08.08-01:03:25

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