Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26..176s&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
Scientific paper
AD Men had been classified as a probable long-period dwarf nova, while recent spectroscopic data instead suggested a short-period system. We present time-resolved photometry and spectroscopy to determine the orbital period and thus clarify the nature of this object.
The light-curve of AD Men shows the flickering typical for cataclysmic variables, and a clear hump-like periodic modulation with an average amplitude of 0.3 mag. From this variability, we confirm that AD Men is a system at rather high inclination. However, due to the absence of eclipses, an inclination as high as 80° can be ruled out. We derive a photometric period of P = 2.20(02) h. The radial velocity measurements of the Hα emission line confirm this value as the orbital period of the system. It places AD Men at the lower end, but clearly inside, the gap of the period distribution of cataclysmic variables.
AD Men increases the number of known dwarf novae in the period gap to eleven, being one of the six systems that have their orbital period measured directly, while for the remaining five, this parameter has only been deduced from the observed superhump period. So far, not much is known about the dwarf novae in the period gap, nor what makes them special, this being mainly due to the general difficulties in measuring the secondary star in cataclysmic variables. There is hope that with the growing number of systems in the gap, one or the other will qualify for a more thorough research.
Schmidtobreick Linda
Tappert Claus
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