Volume 440, Number 2, September III 2005
|Page(s)||637 - 646|
|Section||Stellar structure and evolution|
|Published online||01 September 2005|
Identification of the optical counterparts of high-mass X-ray binaries through optical photometry and spectroscopy
IESL, Foundation for Research and Technology, 711 10 Heraklion, Crete, Greece e-mail: email@example.com
2 University of Crete, Physics Department, PO Box 2208, 710 03 Heraklion, Crete, Greece
3 Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, 03080 Alicante, Spain
Accepted: 8 May 2005
We present the results of our search for optical counterparts to high-mass X-ray transient sources discovered by various X-ray missions. We obtained CCD images of the X-ray fields through BVR and Hα filters to identify early-type stars in the versus colour–colour diagram. We also obtained medium-resolution spectroscopy of the candidates in order to confirm the presence of Hα emission and perform spectral classification. We report on the discovery of the optical counterparts to two X-ray sources: XTE J1858+034 and IGR J01363+6610, and the follow-up observations of another two, newly identified by our group: SAX J2103.5+4545 and GRO J2058+42. For another source, IGR J00370+6122, we present the first detailed optical spectral analysis. The optical photometry and spectroscopy reveal B-type companions in all five sources; GRO J2058+42, SAX J2103.5+4545 and IGR J01363+6610 are positively identified with Be/X-ray binaries, IGR J00370+6122 with a supergiant X-ray binary, while the nature of the XTE J1858+034 is uncertain. We also study the relationship between the optical and X-ray emission during quiescent states.
Key words: X-rays: binaries / stars: neutron / stars: binaries: close / stars: emission-line, Be / stars: pulsars: general / X-rays: general
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.