2012A&A...547A..28T -
Astronomy and Astrophysics, volume 547A, 28-28 (2012/11-1)
The near-IR counterpart of IGR J17480-2446 in Terzan 5.
TESTA V., DI SALVO T., D'ANTONA F., MENNA M.T., VENTURA P., BURDERI L., RIGGIO A., IARIA R., D'AI A., PAPITTO A. and ROBBA N.
Abstract (from CDS):
Some globular clusters in our Galaxy are noticeably rich in low-mass X-ray binaries.
Terzan 5 has the richest population among globular clusters of X- and radio-pulsars and low-mass X-ray binaries. The detection and study of optical/IR counterparts of low-mass X-ray binaries is fundamental to characterizing both the low-mass donor in the binary system and investigating the mechanisms of the formation and evolution of this class of objects. We aim at identifying the near-IR counterpart of the 11Hz pulsar
IGRJ17480-2446 discovered in
Terzan 5. Adaptive optics (AO) systems represent the only possibility for studying the very dense environment of GC cores from the ground. We carried out observations of the core of
Terzan 5 in the near-IR bands with the ESO-VLT NAOS-CONICA instrument. We present the discovery of the likely counterpart in the K
S band and discuss its properties both in outburst and in quiescence. Archival HST observations are used to extend our discussion to the optical bands. The source is located at the blue edge of the turn-off area in the color-magnitude diagram of the cluster. Its luminosity increase from quiescence to outburst, by a factor 2.5, allows us to discuss the nature of the donor star in the context of the double stellar generation population of
Terzan 5 by using recent stellar evolution models.
Abstract Copyright:
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Journal keyword(s):
pulsars: general - pulsars: individual: IGR J17480-2446 - binaries: close - globular clusters: individual: Terzan 5
Nomenclature:
Fig. 1, Table 1: [TDD2012] N (Nos 1-3).
Simbad objects:
8
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