УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
Having obtained high-resolution optical spectra with the NES spectrograph of the 6-m telescope BTA, we investigated the variability of the spectral features and radial velocity for a cold star which passed the asymptotic branch of giants and is associated with the IRAS 07430+1115 source. The optical spectrum of this post-AGB star with altered chemical composition is purely absorbtional, emissions and other peculiarities are absent in the spectrum. From the measurements of the positions of many metal absorbtions (mainly ions of heavy $s$-process metals) a weak variability of the radial velocity was revealed. The velocity varies with the average value $V_r=37.0$ km/s and the standard deviation $\Delta V_r \approx 0.8$ km/s, which may be a consequence of low-amplitude pulsations in the atmosphere of a far evolved star. The position of the H$\alpha$ line core varies within 40.5–43.8 km/s. Based on measurements of the positions of the rotational components of the (0;0), (1;0) and (2;0) Swan bands of the molecule C$_2$ origin in the circumstellar envelope, the average radial velocity $V_r{\rm (Swan)}=21$ km/s and the expansion velocity typical for post-AGB stars envelope $V_{\rm exp} \approx 16$ km/s are determinated. Using the intensity of the infrared triplet of oxygen, we estimated the luminosity of the central star of the IRAS 07430 system $\log L/L_{\odot} \approx 3.1$ which is within the range of values for post-AGB stars.
stars: AGB and post-AGB, oscillations (including pulsations), atmospheres
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