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Optical Counterpart of the LMXB GX 13+1

Published online by Cambridge University Press:  12 April 2016

P. J. Groot ,
M. van Der Klis ,
J. van Paradijs ,
T. Augusteijn  and
M. Berger
P. J. Groot
Affiliation:
Astronomical Institute ‘Anton Pannekoek’/CHEAF, University of Amsterdam, Amsterdam, The Netherlands
M. van Der Klis
Affiliation:
Astronomical Institute ‘Anton Pannekoek’/CHEAF, University of Amsterdam, Amsterdam, The Netherlands
J. van Paradijs
Affiliation:
Astronomical Institute ‘Anton Pannekoek’/CHEAF, University of Amsterdam, Amsterdam, The Netherlands Physics Department, University of Alabama, Alabama, USA
T. Augusteijn
Affiliation:
ESO, La Silla, Chile
M. Berger
Affiliation:
Astronomical Institute ‘Anton Pannekoek’/CHEAF, University of Amsterdam, Amsterdam, The Netherlands

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We have observed the IR counterpart of the Atoll type LMXB GX 13+1, (Naylor, Charles & Longmore 1991), from 1993 July 11…30, with the Dutch 90 cm telescope at ESO using a Gunn z (0.9–1.0 μm) filter. Over this period 110 usable images (integration time 12 m) were obtained. The data were reduced using the ESO-MIDAS/DAPHOT reduction package. A Lomb-Scargle period search was performed with the PERIOD package.

Fig. 1 shows our Gunn z band image with stars labeled as in Naylor et al. (1991). They propose their star 101 as the IR counterpart. Fig. 2 shows the light curve we obtained for this star. The star is clearly variable on a time-scale of ~ 10 d. To estimate any period more accurately we have made a Lomb-Scargle statistics periodigram (see Fig. 3); maximum power is at 12.6 d. We estimate the error to be ~ 1 day.

Type
X-Ray Binaries
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 367 - 368
Copyright
Copyright © Kluwer 1996

References

Naylor, T., Charles, P.A., Longmore, A.J., 1991, MNRAS, 252, 203 Google Scholar
Lewin, H.G., van Paradijs, J., van der Klis, M., 1988, Sp. Sc. Rev., 46, 273 Google Scholar