Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2009n&link_type=abstract
American Astronomical Society Meeting 210, #20.09; Bulletin of the American Astronomical Society, Vol. 39, p.123
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present the results of spectroscopic observations of the quiescent black hole binary A0620-00 with LDSS3 on the Clay telescope at Las Campanas Observatory. We measure absorption-line radial velocities of the secondary and find K2=434.6±0.5 km/s; this is the most precise absorption-line radial velocity measurement for the system to date. By fitting the rotational broadening of the secondary, we measure the mass ratio q=0.060±0.04 these results, combined with the orbital period, imply a minimum mass for the compact object of 3.09±0.04 M&sun;. Although X-ray quiescence implies little accretion activity, we find that the disk contributes ≥50% of the light in B and V, and is subject to significant flickering. The variability of the disk makes ellipsoidal constraints on the inclination nearly impossible. Doppler maps in Hα and Hβ show strong disk emission and a bright spot displaced from the gas stream; lower S/N lines show significant bright spot emission, consistent with Marsh et al. (1994). With high S/N, we pursue modulation tomography of Hα and find that the bright spot is strongly modulated at the orbital period. This research was funded by NSF grant 16640156, the Harvard University Graduate School of Arts and Sciences, and a Smithsonian Astrophysical Observatory Clay Fellowship.
Neilsen Joseph
Steeghs Daniel
Vrtilek Saeqa D.
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