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symbiotic

Alert Notice 567: IM Nor monitoring requested for HST COS observations

February 10, 2017: Dr. Ed Sion (Villanova University) and colleagues have requested AAVSO observers' assistance in monitoring the symbiotic-type recurrent nova IM Nor in support of observations with the Hubble Space Telescope Cosmic Origins Spectrograph scheduled for 2017 February 13 - 17 UT.

These observations are part of a study on short orbital period recurrent novae as Supernovae Type Ia progenitors.

Alert Notice 535: R Aqr observing campaign

Ongoing visual, photometric, and spectroscopic observations of R Aqr about once every 10 days are requested, both to detect and observe the next eclipse and to continue the light curve of this star that has been in the AAVSO observing program for over a century.   Elizabeth O. Waagen, August 2017

Alert Notice 485: AG Dra monitoring requested for multiwavelength campaign

June 20, 2013: Dr. Andrea Dupree (Harvard-Smithsonian Center for Astrophysics) has requested AAVSO monitoring of the symbiotic variable AG Draconis from now through at least September 2013 for correlation with upcoming Chandra x-ray and HST ultraviolet observations.

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