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The identification of the optical/IR counterpart of the 15.8-s transient X-ray pulsar XTE J1946+274

Clark, J. S. (2002). The identification of the optical/IR counterpart of the 15.8-s transient X-ray pulsar XTE J1946+274. Astronomy and Astrophysics, 393(3) pp. 983–989.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1051/0004-6361:20021087
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Abstract

We report on the discovery of the optical/IR counterpart of the 15.8s transient X-ray pulsar XTE J1946+274. We re-analysed archival BeppoSAX observations of XTE J1946+274, obtaining a new refined position (a circle with 22" radius at 90% confidence level). Based on this new position we carried out optical and infra-red (IR) follow-up observations. Within the new error circle we found a relatively optical faint (B=18.6) IR bright (H=12.1) early type reddened star (V--R=1.6). The optical spectra show strong H-alpha and H-beta emission lines. The IR photometric observations of the field confirm the presence of an IR excess for the H-alpha--emitting star (K=11.6, J--H=0.6) which is likely surrounded by a circumstellar envelope. Spectroscopic and photometric data indicate a B0--1V--IVe spectral-type star located at a distance of 8--10kpc and confirm the Be-star/X-ray binary nature of XTE J1946+274.

Item Type: Journal Article
ISSN: 1432-0746
Keywords: stars: individual: � XTE J1946+274; GROJ1944+26 � binaries: general � stars: pulsars: general � stars: emission� line, Be � X�rays: stars
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 14909
Depositing User: Astrid Peterkin
Date Deposited: 19 Feb 2009 14:38
Last Modified: 15 Feb 2012 07:01
URI: http://oro.open.ac.uk/id/eprint/14909
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