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Spectroscopic observations of the counterpart of IGR J00291+5934

ATel #356; G. Roelofs (Univ. of Nijmegen), P. G. Jonker, D. Steeghs, M. Torres (CfA), G. Nelemans (Univ. of Nijmegen)
on 5 Dec 2004; 19:11 UT
Credential Certification: P.G. Jonker (pjonker@cfa.harvard.edu)

Subjects: Optical, Binary, Neutron Star, Transient, Pulsar

Referred to by ATel #: 361, 366, 1660

Spectroscopic observations of the optical counterpart of the millisecond X-ray pulsar IGR J00291+5934 (Atel #352, 353) reported in an Atel by Fox & Kulkarni were obtained (Dec 5 00:29-01:15 UT) with the ISIS spectrograph mounted on the 4.2m William Herschel Telescope on La Palma. Weather conditions were not optimal with a seeing of ~2" and thin clouds. The spectra show weak evidence for broad emission line features near the HeII line at 4686 Angstrom and near the Halpha line at 6563 Angstrom. This further supports the identification of the proposed source as the optical counterpart of IGR J00291+5934.