Optical photometry of Sco X-2.

O. Barziv; E. Kuulkers; M. Mendez; F. van der Hooft; P. J. Groot; M. van der Klis; C. Kemper; J. van Paradijs

Optical photometry of Sco X-2.

O. Barziv, E. Kuulkers, M. Mendez, F. van der Hooft, P. J. Groot, M. van der Klis, C. Kemper, J. van Paradijs

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Abstract

We present optical photometry of the galactic bulge low-mass X-ray binary GX349+2 (Sco X-2) obtained in July 1993 and March 1996. Short-term variations up to one magnitude are present on time scales of a few hours, which are related to the known X-ray behaviour of the source. We find (equally strong) evidence for a periodicity at either 22.3 hours or at 14.9 days. These periodicities are close to the 22 hour reported by Wachter & Margon (1996AJ....112.2684W) and the 14 day period reported by Southwell et al. (1996IAUCo.158..365S). The two periods are related to each other through aliasing with the frequency of observations, which is approximately one day. We therefore suggest that one of the periods reported is the true (orbital) period, whereas the other is the ~1 day alias. This confirms that both reported periods are present in the data. Independent of which is the real one, we conclude that the orbital period if Sco X-2 is relatively long.

Original language	English
Pages (from-to)	1035-1038
Journal	Astronomy and Astrophysics
Volume	325
Publication status	Published - 1-Sept-1997
Externally published	Yes

Keywords

STARS: BINARIES: ECLIPSING
STARS: IMAGING
STARS: INDIVIDUAL: GX 349+02 = SCO X-2

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@article{84c3a53f0b6644a9bbb5891e84870a91,

title = "Optical photometry of Sco X-2.",

abstract = "We present optical photometry of the galactic bulge low-mass X-ray binary GX349+2 (Sco X-2) obtained in July 1993 and March 1996. Short-term variations up to one magnitude are present on time scales of a few hours, which are related to the known X-ray behaviour of the source. We find (equally strong) evidence for a periodicity at either 22.3 hours or at 14.9 days. These periodicities are close to the 22 hour reported by Wachter & Margon (1996AJ....112.2684W) and the 14 day period reported by Southwell et al. (1996IAUCo.158..365S). The two periods are related to each other through aliasing with the frequency of observations, which is approximately one day. We therefore suggest that one of the periods reported is the true (orbital) period, whereas the other is the ~1 day alias. This confirms that both reported periods are present in the data. Independent of which is the real one, we conclude that the orbital period if Sco X-2 is relatively long.",

keywords = "STARS: BINARIES: ECLIPSING, STARS: IMAGING, STARS: INDIVIDUAL: GX 349+02 = SCO X-2",

author = "O. Barziv and E. Kuulkers and M. Mendez and {van der Hooft}, F. and Groot, {P. J.} and {van der Klis}, M. and C. Kemper and {van Paradijs}, J.",

year = "1997",

month = sep,

day = "1",

language = "English",

volume = "325",

pages = "1035--1038",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = " EDP Sciences",

}

TY - JOUR

T1 - Optical photometry of Sco X-2.

AU - Barziv, O.

AU - Kuulkers, E.

AU - Mendez, M.

AU - van der Hooft, F.

AU - Groot, P. J.

AU - van der Klis, M.

AU - Kemper, C.

AU - van Paradijs, J.

PY - 1997/9/1

Y1 - 1997/9/1

N2 - We present optical photometry of the galactic bulge low-mass X-ray binary GX349+2 (Sco X-2) obtained in July 1993 and March 1996. Short-term variations up to one magnitude are present on time scales of a few hours, which are related to the known X-ray behaviour of the source. We find (equally strong) evidence for a periodicity at either 22.3 hours or at 14.9 days. These periodicities are close to the 22 hour reported by Wachter & Margon (1996AJ....112.2684W) and the 14 day period reported by Southwell et al. (1996IAUCo.158..365S). The two periods are related to each other through aliasing with the frequency of observations, which is approximately one day. We therefore suggest that one of the periods reported is the true (orbital) period, whereas the other is the ~1 day alias. This confirms that both reported periods are present in the data. Independent of which is the real one, we conclude that the orbital period if Sco X-2 is relatively long.

AB - We present optical photometry of the galactic bulge low-mass X-ray binary GX349+2 (Sco X-2) obtained in July 1993 and March 1996. Short-term variations up to one magnitude are present on time scales of a few hours, which are related to the known X-ray behaviour of the source. We find (equally strong) evidence for a periodicity at either 22.3 hours or at 14.9 days. These periodicities are close to the 22 hour reported by Wachter & Margon (1996AJ....112.2684W) and the 14 day period reported by Southwell et al. (1996IAUCo.158..365S). The two periods are related to each other through aliasing with the frequency of observations, which is approximately one day. We therefore suggest that one of the periods reported is the true (orbital) period, whereas the other is the ~1 day alias. This confirms that both reported periods are present in the data. Independent of which is the real one, we conclude that the orbital period if Sco X-2 is relatively long.

KW - STARS: BINARIES: ECLIPSING

KW - STARS: IMAGING

KW - STARS: INDIVIDUAL: GX 349+02 = SCO X-2

M3 - Article

SN - 0004-6361

VL - 325

SP - 1035

EP - 1038

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

ER -

Optical photometry of Sco X-2.

Abstract

Keywords

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