2007A&A...476..301B


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.29CET05:43:39

2007A&A...476..301B - Astronomy and Astrophysics, volume 476, 301-306 (2007/12-2)

X-ray eclipse time delays in 4U 2129+47.

BOZZO E., FALANGA M., PAPITTO A., STELLA L., PERNA R., LAZZATI D., ISRAEL G., CAMPANA S., MANGANO V., DI SALVO T. and BURDERI L.

Abstract (from CDS):

4U 2129+47 was discovered in the early 80's and classified as an accretion disk corona source due to its broad and partial X-ray eclipses. The 5.24h binary orbital period was inferred from the X-ray and optical light curve modulation, implying a late K or M spectral type companion star. The source entered a low state in 1983, during which the optical modulation disappeared and an F8 IV star was revealed, suggesting that 4U 2129+47 might be part of a triple system. The nature of 4U 2129+47 has since been investigated, but no definitive conclusion has been reached. Here, we present timing and spectral analyses of two XMM-Newton observations of this source, carried out in May and June, 2005. We find evidence for a delay between two mid-eclipse epochs measured ∼22 days apart, and we show that this delay can be naturally explained as being due to the orbital motion of the binary 4U 2129+47 around the center of mass of a triple system. This result thus provides further support in favor of the triple nature of 4U 2129+47.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - binaries: eclipsing - stars: individual: 4U 2129+47 - stars: neutron - X-rays: stars

Simbad objects: 2

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Number of rows : 2

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* V691 CrA LXB 18 25 46.8186056396 -37 06 18.529015318 14.30 15.20 15.1     ~ 398 0
2 V* V1727 Cyg LXB 21 31 26.2132551598 +47 17 24.514506031 16.75 17.05 16.4     ~ 229 0

    Equat.    Gal    SGal    Ecl

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2020.02.29-05:43:39

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