Spectroscopic detection of resolved ejecta of nova V1494 Aqlстатья

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[1] Spectroscopic detection of resolved ejecta of nova v1494 aql / E. A. Barsukova, A. F. Valeev, V. P. Goranskij, A. V. Zharova // The Astronomer’s Telegram. — 2013. — no. 5454. — P. 1–1. We performed spectroscopic observations of V1494 Aql with the Russian 6-m BTA telescope and SCORPIO multi-mode focal reducer around 2013 June 9.97 UT on the 4938 day (or 13.5 years) after the light maximum. Total exposure was 1201 s, seing 1.4 arcsec, spectral resolution 14 A, spectral range 3800-7800 A, and slit position angle ∼0. We found spatially resolved structure around H alpha emission line extended by 6.5 arcsecs in angular size and for 2600 km/s along radial velocity. No such features were seen in other lines. The structure may be formed by an empty spherical shell expanding with the velocity of 1300 km/s. Alternatively this structure can be an edge-on ring located along the slit and expanding with the same velocity. The expansion velocity ∼0.24 arcsec/year corresponds to a distance of 1.2 +/-0.2 kpc. The strongest emission line in the spectrum is He II 4686 A. Other He II emissions at 4200, 4542, and 5412 A are identified. Balmer emissions are well presented at shortwave range till H zeta. Flux ratio of H beta to HeII 4686 A is equal to 0.38. There are weak emissions of He I at 4026, 5876 and 6678 A. Other lines are Bowen blend C III/N III, and C IV blend at 5805 A.

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