Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mst..........3r&link_type=abstract
Masters Thesis, INPE-7120-TDI/671
Astronomy and Astrophysics
Astrophysics
Astrophysics, Research, Cataclysmic Variables, Emission Spectra, Spectroscopic Analysis, Eclipses, Estimating, Helium Isotopes, Liquid Helium, Periodic Variations, Photometry, Stellar Mass, Time Series Analysis, Tropical Regions
Scientific paper
One way of studying an object in astrophysics is with the time series analysis, where we can characterize the behaviour of object in the past and future. To make this analysis, we use period determination methods. We applied five methods to the cataclysmic variable CZ Aquilae, with the goal to find their orbital period. Photometric and spectroscopic data were analyzed. The photometric data analysis found an orbital period of O.320273 day and the spectroscopic data analysis found an orbital period of 0.201528 day. We choiced the period found by spectroscopic data analysis because this showed good fits and the photometric data showed an indication of this period can be the period of the system. The CZ Aquilae spectrum, characterized by emission lines in H(alpha) (6562,8 k) and He I (5876 and 6678 A), besides the absorption lines attributed to diffuse interstellar bands, is typical of a dwarf nova, but we have suspects of this object can be a SW sex type (as the object don't presents eclipses and almost all SW Sex systems are eclipsing, it's difficult to make a more conclusive analysis). We still can say CZ Aquilae would not be a dwarf nova of type SU UWa, because the SU UMa has short periods (more or less two hours). Another features of the system: it has a low galactic latitude, it has an estimated distance of 243 pc (but this value has great uncertainties). The mass of primary was estimated in the range 0.6 - 1.0 solar mass considering the mass of secondary with the value 0.48 solar mass. and the orbital inclination was estimated in the range 37 deg. - 53 deg..
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