Stellar spectropolarimetry with the 6-m telescope BTA. II. Primary focus Echellé spectrographs

Панчук, В. Е.; Клочкова, В. Г.; Yushkin, M. V.; Yakopov, G. V.; Verich, Yu. B.

doi:10.17586/0021-3454-2017-60-1-53-62

Cited by 4 publications

(2 citation statements)

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“…The complex structure of such an envelope begins to form after the transition from a spherical wind in the AGB stage to a superwind in the subsequent stage [26]. To develop possibilities for polarimetric observations with high spectral resolution, an echelle spectropolarimeter designed to operate at the primary focus of the SAO 6-m telescope is currently in the assembly stage [27,28].…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

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

Клочкова¹,

Ченцов²,

Панчук³

et al. 2017

Astron. Rep.

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For the first time, 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. The spectral type of this 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 Vr 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 Vr(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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Section: Discussion Of the Resultsmentioning

confidence: 99%

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

Клочкова¹,

Ченцов²,

Панчук³

et al. 2017

Astron. Rep.

View full text Add to dashboard Cite

show abstract

“…In the case of observations with medium spectral resolution polarization effects can be referred to separate spectral fragments or features. For example, Be stars have smaller polarization degree of the emission spectrum [169]. The proper variable polarization of M-type supergiants (up to 2%) caused by giant convective cells is also better to study with low spectral resolution.…”

Section: Spectropolarimetersmentioning

confidence: 99%