Nightly monitoring of AG Dra in support of HST calibration observations

Details Nightly monitoring of AG Dra in support of HST calibration observations Nightly monitoring of AG Dra in support of HST calibration observations

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aan...399....1t&link_type=abstract

AAVSO Alert Notice 399

Physics

Ag Dra, Symbiotic Star, Hst, Cosmic Origins Spectrograph, Simultaneous Observations, Multicolor Observations, Aavso International Database

Scientific paper

Edward Smith (STScI) has requested nightly photometric monitoring of the symbiotic star AG Dra during the period August 2 through mid-September 2009. Nightly B- and V-band monitoring, particularly B-band, and visual observations are requested. The Cosmic Origins Spectrograph on the Hubble Space Telescope will be used to observe UV spectral lines; the purpose is to test and calibrate this newly-installed instrument. Observations of AG Dra in quiescence are needed; outburst magnitudes may damage the COS, so observers are asked to report quickly any observations significantly above quiescence to the AAVSO via WebObs. Observations should be submitted to the AAVSO International Database.

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