The spectroscopic mass ratio of the black hole binary XTE J1118+480

Details The spectroscopic mass ratio of the black hole binary XTE J1118+480 The spectroscopic mass ratio of the black hole binary XTE J1118+480

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001atel...67....1o&link_type=abstract

The Astronomer's Telegram, #67

Astronomy and Astrophysics

Astronomy

15

Optical, Binaries, Black Holes, Transients

Scientific paper

I obtained spectra of the black hole binary XTE J1118+480 with the 4.2 meter William Hershel Telescope on La Palma February 16/17, 2001. The instrumental configuration was the red arm of ISIS and the R600R grating, which yielded wavelength coverage from 5850 to 6650 Angstroms at a resolution of 1.55 Angstroms FWHM. A total of 22 useful spectra were obtained. From the radial velocities I find K_2 = 704 +/- 11 km/sec and T_0 = HJD 2,451,957.4278 +/- 0.0005.

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