AG Dra monitoring requested
Active Dates: April 3, 2017 – April 3, 2017
Abstract:
Dr. Rudolf Gális (Pavel Jozef Šafárik University (Slovakia)) and colleagues have requested AAVSO assistance in observing the symbiotic variable AG Dra. Observations are requested as a follow-up to spectroscopic observations and in order to monitor the system for an anticipated outburst.
Justification:
AG Dra is one of the best studied symbiotic systems, which undergoes characteristic symbiotic activity with alternating quiescent and active stages. The latter ones consist of several outbursts in intervals of about 1 yr. After seven years of flat quiescence following the 2006-08 major outbursts, in the spring of 2015, AG Dra entered the active stage with two minor outbursts (in 2015 and 2016) up to now. Such behaviour is quite unusual in the photometric history of AG Dra, so the further systematic photometric monitoring of this symbiotic binary is highly desirable. We expect the next outburst of AG Dra in the late spring of 2017.
Requested Data Types:
Photometry
Targets
| Name | Magnitude | Variability Type | Photometry Notes | Spectroscopy Notes |
|---|---|---|---|---|
| AG Dra | 7.90 | ZAND |
Cadence: Not Specified Precision: 100 |
Not Requested |
Spectroscopy Lines:
No spectroscopy lines provided
Photometry Filters:
No photometry filters provided
Comparison Stars:
No comparison stars provided
Co-Authorship
Observers are not eligible for co-authorship.
Additional Observer Input:
Not provided
Additional Submission Location:
Not provided
Forum URL
N/A
Notes:
Principal Investigator: Dr. Rudolf Gális; Imported Campaign (Alert Notice #572)