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Astron. Astrophys. 318, 908-924 (1997)

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9. Summary and conclusions

The main results of the present work are the following:

1. The distance of Nova V 1974 Cygni estimated indirectly using MMRD relations is in full agreement with the distance determined directly from the expansion of the envelope leading to the value d = (1.77 [FORMULA] 0.11) kpc.

2. Two expanding envelopes were detected - the outer low mass envelope and the inner massive envelope. Both envelopes are prolate.

3. The wind from the white dwarf consists of a spherical and a polar component. The velocity of the polar wind is two times larger than the velocity of the spherical wind. Winds are responsible for shaping of the outer envelope and acceleration of both envelopes.

4. The outer envelope consists of a spherical and a polar component.

5. The inner massive envelope consists of the dense equatorial ring and polar blobs. The ring is immersed in the spherical lower density envelope. The advance of equatorial ring with time was detected.

6. A magnetic fountain that originates in the polar region of the inner envelope was discovered. Interaction of the particles flowing from region of blobs in meridional arcs (flux tubes) with expanding spherical inner envelope is responsible for the origin of observed bright spots detected also as emission knots on high resolution spectra. Shaping of the inner envelope is largely affected by the magnetic field of the white dwarf.

7. The inclination angle of the polar ejecta of both envelopes with respect to the line of sight is 38 [FORMULA] 7 [FORMULA] 2 [FORMULA] 1.

8. A decrease of expansion velocities of the ring and blob of the inner envelope after day 318 was detected. It can be either caused by the deceleration of the envelope due to the interaction with preoutburst circumstellar shell and/or apparently caused by the change of the inclination angle of the blobs and deviation of the ring from circular shape.

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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