[ITAL]Hubble Space Telescope[/ITAL] Detection of a Quiescent Low-Mass X-Ray Binary Companion in 47 Tucanae
Open Access
- 1 January 2002
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 564 (1) , L17-L20
- https://doi.org/10.1086/338776
Abstract
We present the results of a search for optical counterparts to the two quiescent low-mass X-ray binaries (X5 and X7) in the globular cluster 47 Tucanae, using high-quality Chandra and Hubble Space Telescope images. A faint blue (V = 21.7; U-V = 0.9) star within 003 of the eclipsing system X5 shows variability on both short and long timescales and is the counterpart of the X-ray source. The colors and variability of this object are consistent with the combination of light from an accretion disk and a red main-sequence star (possibly somewhat larger than a normal main-sequence star with similar luminosity). No evidence is found for a star showing either variability or unusual colors near the position of X7, but a probable chance superposition of a star with V = 20.25 limits the depth of our search.Keywords
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This publication has 17 references indexed in Scilit:
- [ITAL]Chandra[/ITAL] Exposes the Core-collapsed Globular Cluster NGC 6397The Astrophysical Journal, 2001
- Identification of the Low‐Mass X‐Ray Binary and Faint X‐Ray Sources in NGC 6652The Astrophysical Journal, 2001
- The Discovery of a Second Luminous Low-Mass X-Ray Binary in the Globular Cluster M15The Astrophysical Journal, 2001
- The Bright Optical Companion to the Eclipsing Millisecond Pulsar in NGC 6397The Astrophysical Journal, 2001
- The Frequency of Binary Stars in the Core of 47 TucanaeThe Astrophysical Journal, 2001
- Optical Detection of a Variable Millisecond Pulsar Companion in 47 TucanaeThe Astrophysical Journal, 2001
- A Lack of Planets in 47 Tucanae from a [ITAL]Hubble Space Telescope[/ITAL] SearchThe Astrophysical Journal, 2000
- The Formation Rate of Blue Stragglers in 47 TucanaeThe Astrophysical Journal, 2000
- The Photometric Performance and Calibration of WFPC2Publications of the Astronomical Society of the Pacific, 1995
- An X-ray survey of globular clusters and their X-ray luminosity functionThe Astrophysical Journal, 1983