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Keck Optical Spectra of the Counterpart of IGR J00291+5934 Keck Optical Spectra of the Counterpart of IGR J00291+5934

ATel #366; A. V. Filippenko, R. J. Foley (University of California, Berkeley), P. J. Callanan (Cork University)
on 13 Dec 2004; 10:44 UT
Credential Certification: Alexei V. Filippenko (alex@astro.berkeley.edu)

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

Referred to by ATel #: 1660

Inspection of CCD spectra (range 320-940 nm) obtained on Dec. 12 UT with the Keck I 10-m telescope (+ LRIS; integration time 300 s on each of the blue and red sides) shows that the object detected by Fox & Kulkarni (ATEL #354) does indeed appear to be the optical counterpart to IGR J00291+5934 (ATEL #352), as was also noted by Roelofs et al. (ATEL #356). Superposed on the blue continuum are broad (FWHM = 1200 km/s) emission lines of H-alpha (equivalent width 0.96 nm), H-beta (EW = 0.54 nm), and He I 667.8 nm (EW = 0.1 nm), as well as narrow (FWHM = 300 km/s), very weak (EW = 0.06 nm) He II 468.6 nm emission.