Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-12
Mon.Not.Roy.Astron.Soc. 326 (2001) 621
Astronomy and Astrophysics
Astrophysics
Accepted by MNRAS
Scientific paper
10.1046/j.1365-8711.2001.04614.x
We analysed archival spectroscopic data of AM CVn taken with the William Herschel Telescope in 1996. In the literature two orbital periods for AM CVn are proposed. A clear S-wave in the HeI 4471, 4387 and 4143 \AA lines is revealed when the spectra are folded on the 1029 s period. No signature of this S-wave is seen when folded on 1051 s. Doppler tomography of the line profiles shows a clear signature of the hotspot. Using this we can constrain the value of K_2 to lie between 210 and 280 km/s. Our work confirms the binary nature of AM CVn beyond any doubt, establishes 1028.73 s as the true orbital period and supports the interpretation of AM CVn as a permanent superhump system.
Groot Paul J.
Nelemans Gija
Steeghs Daniel
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