Accretion disk around ES Kit's cataclysmic variable

Accretion disk around ES Kit's cataclysmic variable

The researchers performed a spectroscopic review of the cataclysmic variable ES Kit, which made it possible to obtain important information about the emission of gas from the object. Conclusions suggest the presence of an accretion disk in the system.

Cataclysmic variables (CV) are double star systems represented by a white dwarf and a normal stellar satellite. They irregularly increase the brightness to a large extent, after which they return to a state of rest. These double objects are found in the center of the Milky Way galaxy, solar surroundings and open globular clusters.

Accretion disk around ES Kit's cataclysmic variable

The average spectrum of ES Kita, obtained by the Magellan telescope on October 27-28, 2002. All lines can be identified with He II, He I or N III

Star type AM Canes Dogs - a rare type of CV, where a white dwarf selects a substance with a low content of hydrogen from a compact star-neighbor. That is, we are faced with helium-rich binary stars with no traces of hydrogen in the spectra and rotation periods of 5-65 minutes. ES China is AM Hound Dogs with the shortest orbital period (620 seconds). The researchers decided to conduct spectroscopic observations of the system, hoping that this would improve the understanding of the formation of binary stars. At the end of 2002, they used one of Magellan’s (6.5-meter) Magellan telescopes (Chile) to extract more than 500 ES Cera spectra, studying important information about gas emissions.

The analysis revealed the predominance of ionized helium emission lines, as well as neutral helium and nitrogen lines. Conclusions suggest that the accretion process in ES Kit proceeds via a disk, which means that you can cross out the previous options, such as a direct impact scenario.

Scientists also added that hot gas forms a disc-shaped signature in ES Kita. Further studies of the system and the creation of equivalent Doppler maps based on the monitored spectra are planned.

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