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A New Active Stage of the Symbiotic Star CH Cygni

ATel #10142; Takashi Iijima (INAF Astronomical Observatory of Padova, Asiago Station)
on 4 Mar 2017; 04:22 UT
Credential Certification: TAKASHI IIJIMA (takashi.iijima@oapd.inaf.it)

Subjects: Optical, Cataclysmic Variable, Star, Variables

The spectral variation of the symbiotic star CH Cygni has been monitored at Asiago Astrophysical Observatory using the 1.22m Galileo telescope. Recently, P Cygni type high velocity absorption components appeared on the H I Balmer lines, which were not seen in early December 2016. The blue-shifts of the absorption components from the narrow emission ones were -1890 km/s on 2017 Jan. 24.20 UT, -2040 km/s on Feb. 15.19, -2240 km/s on Feb. 26.13, and -1930 km/s on March 3.16. The equivalent widths of those of H_beta on respective date were 0.16, 0.17, 0.32, and 0.09 nm, and their FWHMs were roughly 0.6 nm. This object has probably entered a new active stage.