Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009astl...35..182t&link_type=abstract
Astronomy Letters, Volume 35, Issue 3, pp.182-194
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We present the results of our spectroscopic and photometric observations of the classical symbiotic star V1413 Aql in 2003-2007, which cover the transition phase of its hot component from activity to quiescence. Various quiescence criteria for the hot component of the system are analyzed. Judging by its photometric characteristics, the system had not yet returned to quiescence by 2007, although a fairly strong He II λ4686 Å line observed previously during quiescence in 1993 appeared in its spectrum. We model the continuum energy distribution for V1413 Aql based on a standard three-component model and a model with an accretion disk. Analysis of the forbidden [O III] and [Ne III] lines shows that the neon abundance in V1413 Aql may be enhanced with respect to the oxygen abundance. The cool component of V1413 Aql has been found to be a variable M5-type red giant, with the variability amplitude at λ = 7500 Å being at least 2 m .
Esipov Valentine F.
Kolotilov Eugenii A.
Tatarnikov A. M.
Tatarnikova A. A.
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