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

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dc.creatorVerrecchia, F.
dc.creatorIsrael, G. L.
dc.creatorNegueruela, I.
dc.creatorCovino, S.
dc.creatorPolcaro, V. F.
dc.creatorClark, J. S.
dc.creatorSteele, I. A.
dc.creatorGualandi, R.
dc.creatorSpeziali, R.
dc.creatorStella, L.
dc.date2002-07-26
dc.date2002-07-26
dc.date.accessioned2026-07-07T10:31:19Z
dc.date.available2026-07-07T10:31:19Z
dc.descriptionWe 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.
dc.descriptionAccepted for publication on A&A (7 pages and 4 figures)
dc.identifierhttps://arxiv.org/abs/astro-ph/0207587
dc.identifierhttp://arxiv.org/abs/astro-ph/0207587
dc.identifierAstron.Astrophys.393:983-990,2002
dc.identifierdoi:10.1051/0004-6361:20021087
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178368
dc.subjectAstrophysics
dc.titleThe identification of the optical/IR counterpart of the 15.8-s transient X-ray pulsar XTE J1946+274
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