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Non-stationary wind in the system of the infrared source RAFGL 5081

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Abstract

Based on long-term spectral monitoring with high spectral resolution, the optical spectrum of the weak central star of the IR source RAFGL 5081 has been studied for the first time. The spectral type of the star is close to G5–8 II, and its effective temperature is Teff ≈ 5400 K. An unusual spectral phenomenon was discovered: splitting of the profiles of broad, stationary absorption lines of medium and low intensity. The heliocentric radial velocities V r of all components of metal absorption lines, the Na I D lines, and the Hα line were measured for all the observation epochs. The constancy of the absorption lines rules out the possibility that the line splitting is due to binarity. The radial velocities of the wind components in the profiles of the Na I D and Hα lines reach −250 and −600 km/s, respectively. These profiles have narrow components, whose number, depth, and position vary with time. The time variability and multicomponent structure of the profiles of the Na I D and Hα lines indicates inhomogeneity and instability of the circumstellar envelope of RAFGL 5081. The presence of components with velocity V r (IS) = −65 km/s in the Na I (1) lines provides evidence that RAFGL 5081 is located behind the Perseus arm, i.e, no closer than 2 kpc. It is noted that RAFGL 5081 is associated with the reflection nebula GN 02.44.7.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachay-Cherkess Republic, Novosibirsk, 357169, Russia

    V. G. Klochkova, E. L. Chentsov, V. E. Panchuk, N. S. Tavolzhanskaya & M. V. Yushkin

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  1. V. G. Klochkova
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  2. E. L. Chentsov
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  3. V. E. Panchuk
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  4. N. S. Tavolzhanskaya
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  5. M. V. Yushkin
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Correspondence to V. G. Klochkova.

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Original Russian Text © V.G. Klochkova, E.L. Chentsov, V.E. Panchuk, N.S. Tavolzhanskaya, M.V. Yushkin, 2017, published in Astronomicheskii Zhurnal, 2017, Vol. 94, No. 11, pp. 959–970.

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Klochkova, V.G., Chentsov, E.L., Panchuk, V.E. et al. Non-stationary wind in the system of the infrared source RAFGL 5081. Astron. Rep. 61, 962–973 (2017). https://doi.org/10.1134/S1063772917100067

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  • DOI: https://doi.org/10.1134/S1063772917100067

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