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Stellar Wind Accretion and Raman O VI Spectroscopy of the Symbiotic Star AG Draconis

Published online by Cambridge University Press:  30 December 2019

Young-Min Lee ,
Jeong-Eun Heo ,
Hee-Won Lee ,
Ho-Gyu Lee ,
Rodolfo Angeloni ,
Francesco Di Mille  and
Tali Palma
Young-Min Lee
Affiliation:
Department of Physics and Astronomy, Sejong University, Seoul, Korea email: [email protected]
Jeong-Eun Heo
Affiliation:
Department of Physics and Astronomy, Sejong University, Seoul, Korea email: [email protected]
Hee-Won Lee
Affiliation:
Department of Physics and Astronomy, Sejong University, Seoul, Korea email: [email protected]
Ho-Gyu Lee
Affiliation:
Korea Astronomy and Space Science Institute, Daejeon, Korea
Rodolfo Angeloni
Affiliation:
Departamento de Física y Astronomía, Universidad de La Serena, La Serena, Chile
Francesco Di Mille
Affiliation:
Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile
Tali Palma
Affiliation:
Observatorio Astronómico, Universidad Nacional de Córdoba, Córdoba, Argentina
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Abstract

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Raman scattered O VI features at 6825 Å and 7082 Å found in symbiotic stars are important spectroscopic tools to probe the mass transfer process. Adopting a Monte Carlo approach, we perform a profile analysis of Raman O VI features of the yellow SySt AG Draconis and make a comparison with the spectrum obtained with CFHT. It is assumed that the accretion flow is convergent on the entering side with enhanced O VI emission and the flux ratio F(1032)/F(1038)∼1, whereas on the opposite side the flow is divergent with low O VI emission and F(1032/F(1038)∼2. Our best fit to the spectrum is obtained from our model with a mass-loss rate of the giant ∼4 × 10−7 M⊙ yr−1. A slight red wing excess in the spectrum suggests the presence of bipolar neutral components receding in the directions perpendicular to the binary orbital plane with a speed ∼70km s−1

Keywords

binaries: symbioticstars: individual: (AG Dra)accretion disksradiative transfer
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 449 - 451
Copyright
© International Astronomical Union 2019 

References

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