Note: The target table was edited to add the range. - Elizabeth O. Waagen, 18 June 2020
June 17, 2020
AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Campaigns and Observation Reports: https://www.aavso.org/test-exposures-for-symbiotic-binary-candidates-campaign
Adrian B. Lucy (Columbia University) requests the assistance of AAVSO observers, and writes:
Note: Note: The Chandra observations took place, and Dr. Karovaska requests continued monitoring of V694 Mon (MWC 560) until further notice. - Elizabeth O. Waagen, 17 April 2020
Note: Note: Observations of V694 Mon are scheduled for 11 March 2020 with HST, and for 22 March 2020 with XMM. Please continue to observe as indicated in Alert Notice 695 but with the high-intensity coverage taking place March 9 through March 14 and March 19 through March 25. - Elizabeth O. Waagen, 6 March 2020
Note: Continued observations in all bands (particularly B and V) and spectroscopy are extremely important. Please continue nightly observations until further notice. - Elizabeth O. Waagen, 31 January 2020
Note: The exact schedules for the Chandra and HST observations of R Aqr (Alert Notice 689) are as follow:
Chandra (UT) Note that this date is EARLIER than given in Alert Notice 689.
12 Jan 2020 00:13:21.409 - 12 Jan 2020 14:06:41
September 18, 2019
AAVSO Forum threads (scroll to the bottom of a thread for latest posts):
- Campaigns and Observing Reports: https://www.aavso.org/symbiotic-candidates-campaign
Note: Dr. Margarita Karovska (Center for Astrophysics|Harvard & Smithsonian) is also urgently requesting BVRI photometry, visual observations, and spectroscopy of R Aqr through (at least) the end of the observing season. - Elizabeth O. Waagen, August 5, 2019
Note: R Aqr is out of its seasonal gap and is increasingly observable. Continued coverage is requested as described below until further notice. - Elizabeth O. Waagen, May 3, 2019
This replaces the text of AAVSO Alert Notice 650 issued earlier on Spetember 14, 2018. - E. O. Waagen, AAVSO
Note from Aril 2020: Ongoing coverage continues to be extremely important, with V and particularly B being given priority over Rc and Ic. As always, visual observations are requested and encouraged. - Elizabeth O. Waagen, April 6, 2020
Note from August 2019: Ongoing coverage is extremely important, with V and particularly B being given priority over Rc and Ic. As always, visual observations are requested and encouraged. - Elizabeth O. Waagen, August 28, 2019
Note: This campaign has been extended through the 2018 observing season.
August 4, 2017: Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) has requested "visual, photometric, and spectroscopic observations of the symbiotic variable R Aqr in preparation for and in support of Chandra and HST observations currently scheduled for October 2017."
October 3, 2007: It was reported in CBET 1091 by U. Munari et al. that the symbiotic star AG Draconis is again in outburst following the decline from its April 2006 bright outburst. They note that the decline apparently halted on 2007 July 07, and has since brightened steadily. Their observations place AG Dra at V = 8.98 on 2007 September 30.8 UT (B = 9.69 and B-V = +0.71). They also note the presence of strong hydrogen and helium emission lines.
