2003A&A...405..285R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST20:32:03

2003A&A...405..285R - Astronomy and Astrophysics, volume 405, 285-290 (2003/7-1)

Long-term X-ray variability of the microquasar system LS 5039/RX J1826.2-1450.

REIG P., RIBO M., PAREDES J.M. and MARTI J.

Abstract (from CDS):

We report on the results of the spectral and timing analysis of a BeppoSAX observation of the microquasar system LS 5039/RX J1826.2-1450. The source was found in a low-flux state with FX(1-10keV)=4.7x10–12erg/cm2/s, which represents almost one order of magnitude lower than a previous RXTE observation 2.5 years before. The 0.1-10keV spectrum is described by an absorbed power-law continuum with photon-number spectral index Γ=1.8±0.2 and hydrogen column density of NH=1.0+0.4–0.3x1022cm–2. According to the orbital parameters of the system, the BeppoSAX observation covers the time of an X-ray eclipse should one occur. However, the 1.6-10keV light curve does not show evidence of such an event, which allows us to give an upper limit to the inclination of the system. The low X-ray flux detected during this observation is interpreted as a decrease in the mass accretion rate onto the compact object due to a decrease in the mass-loss rate from the primary.

Abstract Copyright:

Journal keyword(s): stars: individual: LS 5039, RX J1826.2-1450, 3EG J1824-1514 - X-rays: stars - stars: variables: general - continuum: stars radio

Simbad objects: 6

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Number of rows : 6

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* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1373 0
2 V* BP Cru HXB 12 26 37.5607088371 -62 46 13.259605389   12.70 10.66     B1.5Iaeq 604 0
3 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 756 1
4 V* V479 Sct HXB 18 26 15.0561532140 -14 50 54.249464136 12.02 12.23 11.27 11.04   ON6V((f))z 492 2
5 4U 1907+09 HXB 19 09 37.9 +09 49 49   19.41 16.35 14.40 12.53 O8.5Iab 307 1
6 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3923 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-20:32:03

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