Monitoring of CH Cyg requested for Chandra and HST observations

Details Monitoring of CH Cyg requested for Chandra and HST observations Monitoring of CH Cyg requested for Chandra and HST observations

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aan...454....1w&link_type=abstract

AAVSO Alert Notice 454

Computer Science

Databases

Binaries: Symbiotic, Stars: Individual (Ch Cyg), Stars: Variables: General, Astronomical Databases: Miscellaneous

Scientific paper

Dr. Margarita Karovska, Harvard-Smithsonian Center for Astrophysics, has requested visual and photometric observations of the symbiotic variable CH Cyg in preparation for and support of Chandra and HST observations scheduled for later in March 2012. Dr. Karovska's observations will be a followup investigation of the central region of CH Cyg and its jet that was discovered a couple of years ago. AAVSO observations are requested in order to monitor the state of the system and correlate with the satellite observations. Visual observations and CCD/PEP observations in all bands - U through J and H - are requested. Daily observations now through April 2012 and high-speed photometry through March would be appreciated. CH Cyg is currently at visual magnitude 7.7. Halpha, OIII region, and optical spectroscopy are also requested. More details on the exact dates and times of the satellite observations will be announced when they become available, but daily monitoring should begin now. [HST observations scheduled for 2012 March 18; Chandra delayed some days due to X-class solar flare of 2012 March 7.] Coordinates: RA 19 24 33.07 Dec. +50 14 29.1 (J2000.0). Finder charts may be created and data from the AAVSO International Database may be viewed, plotted, or downloaded (www.aavso.org).

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