2008A&A...489..657Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET14:33:06

2008A&A...489..657Z - Astronomy and Astrophysics, volume 489, 657-667 (2008/10-2)

INTEGRAL, XMM-Newton and ESO/NTT identification of AX J1749.1-2733: an obscured and probably distant Be/X-ray binary.

ZURITA HERAS J.A. and CHATY S.

Abstract (from CDS):

AX J1749.1-2733 is an unclassified transient X-ray source discovered during surveys by ASCA in 1993-1999. The transient behaviour and the short and bright flares of the source have led to the idea that it is part of the recently revealed subclass of supergiant fast X-ray transients. A multi-wavelength study in NIR, optical, X-rays, and hard X-rays of AX J1749.1-2733 is undertaken in order to determine its nature. Public INTEGRAL data and our target of opportunity observation with XMM-Newton were used to study the high-energy source through timing and spectral analysis. Multi-wavelength observations in optical and NIR with the ESO/NTT telescope were also performed to search for the counterpart. AX J1749.1-2733 is a new high-mass X-ray binary pulsar with an orbital period of 185.5±1.1 days (or 185.5/f with f=2,3 or 4) and a spin period of ∼66s, parameters typical of a Be/X-ray binary. The outbursts last ∼12d. A spin-down of {dot}(P)=0.08 ±0.02 s/yr is also observed, very likely due to the propeller effect. The most accurate X-ray position is RA(2000)=17:49:06.8 and Dec=27:32:32.5 (uncertainty 2''). The high-energy broad-band spectrum is well-fitted with an absorbed powerlaw and a high-energy cutoff with values NH=20.1–1.3+1.5x1022cm–2, Γ=1.0–0.3+0.1, and Ecut=21–3+5keV. The only optical/NIR candidate counterpart within the X-ray error circle has magnitudes of R=21.9±0.1, I=20.92±0.09, J=17.42±0.03, H=16.71±0.02, and Ks=15.75±0.07, which points towards a Be star located far away (>8.5kpc) and highly absorbed (NH∼1.7x1022cm–2). The average 22-50keV luminosity is 0.4-0.9x1036erg/s during the long outbursts and 3x1036erg/s during the bright flare that occurred on MJD 52891 for an assumed distance of 8.5kpc.

Abstract Copyright:

Journal keyword(s): X-ray: binaries - X-rays: individuals: AX J1749.1-2733 - infrared: stars

Nomenclature: Fig.7, Table 4: [ZC2008] NN (Nos 1-12).

Simbad objects: 18

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Number of rows : 18

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 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 673 0
2 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 885 0
3 GSPC S495-E * 08 27 12.5 -25 08 01           ~ 4 0
4 HD 74194 HXB 08 40 47.7915105936 -45 03 30.231146034 7.05 7.77 7.55 8.70   O8.5Ib-II(f)p 181 0
5 GSPC S262-E * 09 45 42.8 -45 49 40           ~ 4 0
6 TYC 5478-859-1 * 09 48 56.4041736696 -10 30 32.386149806   12.79 11.70     ~ 6 0
7 GSPC S264-D * 10 47 24.1 -44 34 05           ~ 11 0
8 SWIFT J1626.5-5156 HXB 16 26 36.5197160119 -51 56 30.599836308       16.03 14.59 B0V 68 0
9 FS 137 * 16 26 42.8 +05 52 20   13.88 13.34     G1 21 0
10 PG 1633+099 HS* 16 35 24.0242205151 +09 47 49.892841991 13.215 14.205 14.396 14.481 14.609 sdB 105 0
11 PG 1657+078 HS* 16 59 32.2152633688 +07 43 31.413989790 13.919 14.877 15.019 15.098 15.115 sdB 51 0
12 GSPC S875-C * 17 27 22.2592823859 -00 19 23.477732303           ~ 12 0
13 AX J1739.1-3020 HXB 17 39 11.5521531365 -30 20 37.783172824     14.40 13.91   O8.5Iab(f) 142 1
14 2XMM J174906.8-273232 HXB 17 49 06.79 -27 32 32.4           B1-3 41 0
15 IGR J17544-2619 HXB 17 54 25.2724584579 -26 19 52.578788584   14.71 12.94 12.10 10.38 O9Ib 166 0
16 4U 1850-03 HXB 18 48 17.7 -02 25 13           Be? 98 1
17 V* V2246 Cyg HXB 20 32 15.2744631713 +37 38 14.839930326   22.16 19.41 17.32 15.18 B0Ve 382 0
18 NAME Galactic Bulge reg ~ ~           ~ 3531 0

    Equat.    Gal    SGal    Ecl

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