"Peremennye Zvezdy",
Prilozhenie,
vol. 10, N 26 (2010)
Prilozhenie,
vol. 10, N 26 (2010)
FG Sge: Increase of IR Brightness in August 2010
O. Taranova, V. Shenavrin
Sternberg Astronomical Institute, Moscow, Russia
Received: 26.10.2010; accepted: 26.10.2010
(E-mail for contact: taranova@sai.msu.ru)
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Remarks: |
| We report an increase of the J-band brightness of the unique supergiant FG Sge by
the summer of 2010.
It follows from our IR observations of the star (1986-2010) that its J-band
brightness level in August, 2008
reached an absolute minimum (~12m), and till
the
beginning
of the summer of 2010, the star was almost inaccessible for observations at 1.25
microns. In
July,
2010, the star was brighter by approximately 1m in the J band
than
in the summer of 2008. A month later, by the end of August, 2010, the J-band brightness
of the star
increased by 1m and was already ~10m. At 3.5-5.5
microns,
the brightness fluctuations
of FG Sge in 2008-2010 had an amplitude of 0.2m. The figure
shows
J-filter brightness variations
of FG Sge in 1986-2010. The arrow marks the beginning of J-band brightness increase
of the star in 2010. |
Light Curve
|