2011A&A...525A..73F


Query : 2011A&A...525A..73F

2011A&A...525A..73F - Astronomy and Astrophysics, volume 525A, 73-73 (2011/1-1)

4U 1909+07: a well-hidden pearl.

FUERST F., KREYKENBOHM I., SUCHY S., BARRAGAN L., WILMS J., ROTHSCHILD R.E. and POTTSCHMIDT K.

Abstract (from CDS):

We present the first detailed spectral and timing analysis of the high mass X-ray binary (HMXB) 4U1909+07 with INTEGRAL and RXTE. 4U1909+07 is detected in the ISGRI 20-40keV energy band with an average countrate of 2.6cts/s. The pulse period of ∼604s is not stable, but changing erratically on timescales of years. The pulse profile is strongly energy dependent: it shows a double peaked structure at low energies, the secondary pulse decreases rapidly with increasing energy and above 20keV only the primary pulse is visible. This evolution is consistent between PCA, HEXTE, and ISGRI. The phase averaged spectrum can be well described by the sum of a photoabsorbed power law with a cutoff at high energies and a blackbody component. To investigate the pulse profile, we performed phase resolved spectral analysis. We find that the changing spectrum can be best described with a variation of the folding energy. We rule out a correlation between the black body component and the continuum variation and discuss possible accretion geometries.

Abstract Copyright:

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

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 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 680 0
2 2E 1752 HXB 06 58 17.2878555250 -07 12 35.203675058   12.38 10.9 11.40   O9.7Ve 75 0
3 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1402 0
4 V* BP Cru HXB 12 26 37.5607088371 -62 46 13.259605389   12.70 10.66     B1.5Iaeq 622 0
5 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12452 0
6 V* MM Ser LXB 18 39 57.56 +05 02 09.6   19.2 19.2     ~ 330 0
7 4U 1901+03 HXB 19 03 39.3919805263 +03 12 15.742327187           OB 79 0
8 4U 1907+09 HXB 19 09 37.9 +09 49 49   19.41 16.35 14.40 12.53 O8.5Iab 313 1
9 4U 1908+075 HXB 19 10 48.2141670291 +07 35 51.715745251           O7.5-9.5sg 107 0
10 SS 433 HXB 19 11 49.5645897700 +04 58 57.824087535   16.3 13.0     A7Ib: 1991 4
11 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2402 0

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2021.10.22-05:01:21

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