[vsnet-alert 1296] Re: v1990 cyg (tav1941+34)

[Taichi Kato <tkato>]

  The variable star V1990 Cyg has the following identifications and cataloged
properties.

194333.47 +342923.9 (2000.0) 10.7 N  (GSC)
IRAS19416+3422 194140.8 +342209 (1950.0)
    F12=52.47  F25=17.37  F60=3.02  F100=10.96L
    VAR=68 LRS=22
194334.3 +342919 (2000.0) RAFGL2443
194334.3 +342919 (2000.0) TMSS+30385
194334.4 +342913 (2000.0) CS4443 - - 8.7 -
194333.4 +342925 (2000.0) CYGV1990 M 10.4 13.0 V - - -

  As is usual for a Mira star, it may not be strange to exhibit an unusually
faint minimum, but I think it is also possible the star may be showing
a dust episode, similar to the phenomenon of the carbon Mira V366 Lac
(AFGL 2881), which experienced an extended minimum phase several magnitudes
fainter than its historical pulsation.

Regards,
Taichi Kato

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