2010A&A...523A..90K


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.26CET20:16:24

2010A&A...523A..90K - Astronomy and Astrophysics, volume 523, A90-90 (2010/11-2)

Orbital parameters of supergiant fast X-ray transients.

KARINO S.

Abstract (from CDS):

Supergiant fast X-ray transient (SFXT) is a new class of the high-mass X-ray binary that shows short X-ray flares. The physical mechanism of SFXT short flares is still open for discussion. The accretion process of dense clumps in stellar wind onto neutron star (NS) has been proposed as the origin of such short flares. In order to examine the applicability of the clumpy wind scenario, we focus on the accretion mode that depends on orbital parameters. Our goal is to impose restrictions on the orbital parameters of SFXT. Assuming a simple analytic model of clumpy wind, we investigate the condition where the size of accretion cylinder overcomes the clump size. The allowed parameter region for SFXT is restricted in a relatively narrow window in Porb - e diagram. Binary systems with large eccentricities (e>0.4) and moderate orbital periods (Porb∼10d) are prone to show periodic X-ray outbursts, which are characteristic for SFXT. We confirm that systems with a long orbital period of more than 100 days cannot produce bright X-ray flares in the simple clumpy wind scenario.

Abstract Copyright:

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

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 74194 HXB 08 40 47.7915105936 -45 03 30.231146034 7.05 7.77 7.55 8.70   O8.5Ib-II(f)p 180 0
2 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1378 0
3 HD 306414 s*b 11 21 46.8237210288 -59 51 47.969821291 10.12 10.69 10.23 10.00   B1Ia 136 0
4 V* BP Cru HXB 12 26 37.5607088371 -62 46 13.259605389   12.70 10.66     B1.5Iaeq 610 0
5 2MASS J16463526-4507045 HXB 16 46 35.2592332854 -45 07 04.609816032   15.2       O9.5Ia 87 1
6 2MASS J16480656-4512068 HXB 16 48 06.56 -45 12 06.8           O8.5Iab 122 2
7 AX J1739.1-3020 HXB 17 39 11.5521531365 -30 20 37.783172824       13.91   O8.5Iab(f) 141 1
8 IGR J17544-2619 HXB 17 54 25.2724584579 -26 19 52.578788584   14.71 12.94 12.10 10.38 O9Ib 166 0
9 IGR J18029-2016 HXB 18 02 39.9 -20 17 13           B1b 71 1
10 SAX J1818.6-1703 HXB 18 18 37.8990045305 -17 02 47.970872274     17.4 17.4   ~ 96 0
11 IGR J18483-0311 HXB 18 48 17.2064881183 -03 10 16.876608322 23.702 25.162 21.884 17.888 15.88 B0.5Ia 110 0

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2020.11.26-20:16:24

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