Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2515h&link_type=abstract
American Astronomical Society, HEAD Meeting #5, #25.15; Bulletin of the American Astronomical Society, Vol. 32, p.1222
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an analysis of time-resolved, medium resolution (1.5Å) optical (6200--7100Å) spectroscopy of the low mass X-ray binary Sco X-1. The spectra were obtained during 2000 April 07--10 UT on the 1.5-m telescope at Cerro Tololo Inter-American Observatory. A complete orbital cycle of Sco X-1 was sampled in 40 spectra with orbital phase resolution of ≈0.03. In addition to a new radial velocity curve of the Hα emission line, we present the first Doppler tomograms of Sco X-1. The Hα line profile exhibits several interesting features that have not been seen in previously published spectra of Sco X-1: (1) The main emission component is a strong, narrow peak blue-shifted by ≈ -200 km s-1 (quoted velocities are relative to the rest wavelength of Hα ). This component traces an S-wave as a function of orbital phase in the trailed spectrogram. (2) A narrow absorption feature, reminiscent of an inverse P Cygni profile, is located redward of the Hα emission peak, at ≈ +150 km s-1. The depth and velocity of this feature vary considerably during the orbit. (3) A broad (Δ V≈500 km s-1) wing of Hα emission is visible redward of the absorption feature, at ≈ +600 km s-1. These three features provide valuable clues about the structure of the disk and accretion flow in Sco X-1. Cerro Tololo Inter-American Observatory is operated by AURA, Inc. under cooperative agreement with the NSF.
Hoard Donald Wayne
Wachter Stefanie
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