Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943306r&link_type=abstract
American Astronomical Society, AAS Meeting #219, #433.06
Other
Scientific paper
ASAS 150946-2147.7 is a transient object whose outburst was detected by ASAS in 2009 and reported as a DN-type CV. Its quiescent light curve shows an elliptical variability with an orbital period of 0.70242 d. Before the 2009 outburst, two outbursts were observed.
During the 2009 outburst, strong He II, CIII/NIII emission lines were observed superimposed on a late A or early F-type stellar spectrum, which shows RV variations out of phase. The A or F-type donor star and the orbital period of 0.70242 d are unusual for CVs, and the RV amplitudes in addition to X-ray detected by Swift indicate the possibility of a black hole or neutron binary.
We present high resolution spectroscopy of ASAS1509 taken a week after the 2009 outburst terminated. The spectrum is dominated by early-F type stellar spectrum, and shows no sign of other components. Vsin i measured from metal lines is 85 km/s and their RVs are well fitted by a sine curve with the semi-amplitude of 80 km/s, which is comparable with those of emission lines observed during the outburst.
This work is supported by JSPS Research Fellowships for Young Scientists.
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