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Termination of temperature increase in the supergiant V1302 Aql (IRC+10420)
at the border of the Yellow void detected for the first time
In 1992-2014 at the 6-m SAO RAS telescope with the NES spectrograph, we
conducted high-resolution spectroscopy of the yellow hypergiant V1302 Aql,
the effective temperature of which was rapidly increasing during the 20th
century with a rate of 120 K per year. Observations in 2001-2014 resulted
in the conclusion that the hypergiant entered the phase of temperature
rise termination and, in the Hertzsprung-Russel diagram, it resides near
the Yellow void boundary.
Authors:
Klochkova V.G., Chentsov E.L., Panchuk V.E., Yushkin M.V. (SAO RAS)
in collaboration with Miroshnichenko A.S. (University of North Carolina
at Greensboro, Greensboro, USA)
Published:
V.G.Klochkova, E.L.Chentsov, A.S.Miroshnichenko, V.E.Panchuk, M.V.Yushkin,
High-resolution optical spectroscopy of the yellow hypergiant V1302 Aql
(=IRC+10420) in 2001-2014, 2016, MNRAS, v.459, pp.4183-4190
Measurement of the diameter and detection of the component for the giant lambda Aquarii
In the course of observations with the lunar coverage method at the 6-m
SAO RAS telescope, the authors measured the diameter of the nearby
(plx = 8.47 mas) M giant lambda Aquarii in the pseudo-continuum region.
The angular diameter is 7.11 ± 0.02 mas and the linear - 90 Solar
radii. The authors for the first time detected a weak component of this
star at a distance of 0.526 arcsec. The conducted speckle interferometric
observations allowed the authors to classify the component as a F5 type
of the Main Sequence and to obtain accurate positional parameters of this
system. The work fulfilled shows the advantages of combining the methods
of high spatial resolution astronomy in measuring fundamental parameters
of stars.
Authors:
Dyachenko V.V., Balega Yu.Yu., Beskakotov A.S., Maksimov A.F.,
Rastegaev D.A. (SAO RAS), Richichi A. (National Astronomical Research
Institute of Thailand)
Published:
Dyachenko V., Richichi A., Balega Y., Beskakotov A., Maksimov A.,
Rastegaev D., Lunar occultation and speckle interferomerty
of lambda Aquarii with the SAO RAS 6-meter telescope, 2016,
Stars: from collapse to collapse: Proc. Conf. held at Spec.
Astrophys. Observatory, Nizhny Arkhyz, Russia, 3-7 Oct. 2016, ASP Conf. Ser.
Registration of a predicted giant radio flare of the microquasar Cygnus X-3
September 13, 2016 at the RATAN-600 radio telescope, a rare event was
detected in the microquasar Cygnus X-3 - a strong synchrotron flare with
the flow growth from 0.01 to 15 Jy at 4.6 GHz during four days. Two weeks
prior to this, the authors predicted a flare based on the following
criterion: a flare will surely take place after the system passes to
an "ultrasoft" X-ray state, namely, after disappearing and then appearing
of a hot corona around the disk which consists of matter falling from the
second Wolf-Rayet star onto the black hole. Interaction of different kinds
of radiation from the microquasar is not accidental but is subject to the
laws found and, therefore, is predictable.
Authors:
Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V. (SAO RAS)
Published:
1. Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V.
2016. The predicted giant flare of Cyg X-3 occurs. The Astronomer's
Telegram 9501 .
2. Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V.
2016. The beginning of a giant radio flare from Cygnus X-3.
The Astronomer's Telegram 9444 .
3. Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V.
2016. A new state of quenched radio emission from microquasar Cyg X-3.
The Astronomer's Telegram 9416 .
4. Trushkin S.A., Nizhelskij N.A., Tsybulev P.G., Zhekanis G.V.,
The giant radio flare of Cyg X-3 in September 2016, 2016,
Stars: from collapse to collapse: Proc. Conf. held at Spec.
Astrophys. Observatory, Nizhny Arkhyz, Russia, 3-7 Oct. 2016, ASP Conf. Ser.
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