2001A&A...369..915C


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.22CEST11:17:30

2001A&A...369..915C - Astronomy and Astrophysics, volume 369, 915-924 (2001/4-3)

Results of a LMXB survey: Variation in the height of the neutron star blackbody emission region.

CHURCH M.J. and BALUCINSKA-CHURCH M.

Abstract (from CDS):

We present results of a survey of the spectra of Low Mass X-ray Binaries using ASCA. It is shown that all sources in the survey are well-fitted by the same two-component emission model that we have previously shown is able to describe both the non-dip and dip spectra of the dipping class of LMXB. This model consists of point-like blackbody emission from the neutron star plus Comptonized emission from a disk-like accretion disk corona of radius typically 50000km. Additional data from results published elsewhere by us from BeppoSAX and ASCA are added to the survey. The large variation in blackbody luminosity of survey sources is shown to be due primarily to major changes in blackbody emitting area. Fitting a multi-temperature disk blackbody plus Comptonization model to the survey spectra requires values of inner disk radius substantially less than the neutron star radius in many cases, making disk origin of the blackbody highly unlikely. Assuming that the emission is from an equatorial strip on the neutron star, it is shown that the half-height of the strip h agrees well with the half-height H of the radiatively-supported inner accretion disk, this agreement spanning three orders of magnitude in each parameter. Possible mechanisms for the agreement are discussed, including radial accretion flow between inner disk and star, and accretion flow ``creep'' on the surface of the neutron star.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: neutron - binaries: close - accretion: accretion disks

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 561 0
2 V* GR Mus LXB 12 57 37.153 -69 17 18.98   19.40 19.1     ~ 239 0
3 4U 1323-62 LXB 13 26 36.31 -62 08 09.9           ~ 161 0
4 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1512 0
5 NAME Big Dipper LXB 16 28 05.5318316228 -49 12 40.011030945           ~ 204 0
6 V* V801 Ara LXB 16 40 55.5 -53 45 05 17.50 18.20 17.5     ~ 771 1
7 V* V2216 Oph LXB 17 31 44.17 -16 57 40.9 16.40 17.10 16.8     ~ 260 1
8 4U 1746-371 LXB 17 50 12.66 -37 03 08.2           ~ 180 1
9 4U 1758-25 LXB 18 01 09.7308941918 -25 04 44.128444504           ~ 606 1
10 V* V5512 Sgr LXB 18 14 31.55 -17 09 26.7           K5III 346 0
11 V* MM Ser LXB 18 39 57.56 +05 02 09.6   19.2 19.2     ~ 315 0
12 V* V1333 Aql LXB 19 11 16.05 +00 35 05.8 15.00 15.40 14.8     ~ 982 0
13 V* V1405 Aql LXB 19 18 47.871 -05 14 17.09 20.90 21.40 21.0     ~ 432 0
14 4U 2129+12 LXB 21 29 58.3124 +12 10 02.670 14.50 15.70 15.8     ~ 300 1
15 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.20 14.7     A9III 1059 0

    Equat.    Gal    SGal    Ecl

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2019.09.22-11:17:30

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