Spectroscopic observations of symbiotic stars in 2018-Q4
Abstract
202 spectra of 26 symbiotic stars at resolution from 500 to 15000 were obtained during 2018-Q4. AG Dra has recovered its quiescent state after April 2018 outburst. CH Cyg has been monitoring at a high cadency during its monotonically decline from mag V = 6.4 early august to V = 8.5. More than 700 spectra of CH Cygni are now gathered in the database. First spectrum of the poorly studied EF Aql in the database. Spectra of the new symbiotic Hen 3-1768 detected within the context of the program "suspected symbiotic stars" show strong He II l 4686 and Raman OVI 6830. The new symbiotic star HbHa 1704-058 observed during its decline show increasing raman OVI band (EW = -3.3) while [OIII] and [Fe VII] remain very weak if present. V694 Mon, at high luminosity (V 9) , presents unusual shape of Balmer and Fe II lines: the common broad absorption is replaced by P Cygni profiles at much lower velocities (maximum of absorption -100 km s-1). The prototypical Z And returns to quiescent state after the outburst which occurred in January 2018.
- Publication:
-
Eruptive Stars Information Letter
- Pub Date:
- February 2019
- Bibcode:
- 2019ESIL...40L...4T
- Keywords:
-
- Techniques: spectroscopic;
- Astronomical data bases;
- binaries: symbiotic