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Request for CH Cyg B-V photometry

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Matthew Templeton
Request for CH Cyg B-V photometry

Hello everyone,

Margarita Karovska (Harvard-Smithsonian CfA) has noticed a decline in the visual light curve of CH Cyg over the past few weeks, but we don't currently have B and V photometry for calibration.  A decline in B-band is believed to be a signature of jet ejection by the accretor in this system, and so a decline in broadband visual may indicate something is happening.  B and V photometry would be great, moreso because CH Cyg is a tough target right now (airmass near 2 by evening astronomical twilight).  Please refer to Special Notice #320 for details.

Happy Holidays & clear skies to everyone,

Matthew

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484