On the kinematic state of the atmosphere within IRAS 07430+1115 system

Klochkova V.; Zhuklevich G.; Panchuk V.

doi:doi:10.26119/VAK2024.064

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On the kinematic state of the atmosphere within IRAS 07430+1115 system

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ON THE KINEMATIC STATE OF THE ATMOSPHERE WITHIN IRAS 07430+1115 SYSTEM

Section: STARS AND THE INTERSTELLAR MEDIUM

Proceedings: MODERN ASTRONOMY: FROM THE EARLY UNIVERSE TO EXOPLANETS AND BLACK HOLES Volume 1

UDC 52 UDC 53 UDC 520 UDC 521 UDC 523 UDC 524 UDC 52-1 UDC 52-6

CSCSTI 41.00 CSCSTI 29.35 CSCSTI 29.31 CSCSTI 29.33 CSCSTI 29.27 CSCSTI 29.05

Russian Classification of Professions by Education 03.06.01 Russian Classification of Professions by Education 03.05.01 Russian Classification of Professions by Education 03.04.03

Russian Library and Bibliographic Classification 2 Russian Library and Bibliographic Classification 223

Russian Trade and Bibliographic Classification 614 Russian Trade and Bibliographic Classification 6135

BISAK SCI004000 Astronomy BISAK SCI005000 Physics / Astrophysics

Klochkova V. ¹

Zhuklevich G. ²

Panchuk V. ³

Author and publication information

Authors:

1. Special Astrophysical Observatory of the Russian Academy of Sciences

2. Special Astrophysical Observatory of the Russian Academy of Sciences

3. Special Astrophysical Observatory of the Russian Academy of Sciences

Type:

Сonference article

DOI:

https://doi.org/10.26119/VAK2024.064

EDN:

https://elibrary.ru/qeeimb

Published:

27.12.2024

Subject area:

UDC 52
UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAK SCI004000 Astronomy
BISAK SCI005000 Physics / Astrophysics

Language:

English

Keywords:

stars: AGB and post-AGB, oscillations (including pulsations), atmospheres

Abstract and keywords

Abstract (English):
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

Δ 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

α

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} (S w a n) = 21

km/s and the expansion velocity typical for post-AGB stars envelope

V_{e x p} \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_{⊙} \approx 3.1

which is within the range of values for post-AGB stars.

Keywords:
stars: AGB and post-AGB, oscillations (including pulsations), atmospheres

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References

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