The Open UniversitySkip to content
 

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

Verrecchia, F.; Israel, G. L.; Negueruela, I.; Covino, S.; Polcaro, V. F.; Clark, J. S.; Steele, I. A.; Gualandi, R.; Speziali, R. and Stella, L. (2002). The identification of the optical/IR counterpart of the 15.8-s transient X-ray pulsar XTE J1946+274. Astronomy & Astrophysics, 393(3) pp. 983–989.

Full text available as:
[img]
Preview
PDF (Version of Record) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (640Kb)
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1051/0004-6361:20021087
Google Scholar: Look up in Google Scholar

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 Hα and Hβ emission lines. The IR photometric observations of the field confirm the presence of an IR excess for the Hα-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
Copyright Holders: 2002 ESO
ISSN: 1432-0746
Keywords: XTE J1946+274; GROJ1944+26; binary stars; pulsars; emission line, Be; stellar X-rays
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: 29 Sep 2014 17:39
URI: http://oro.open.ac.uk/id/eprint/14909
Share this page:

Altmetrics

Scopus Citations

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk