2026-04-10T20:31:07Z https://pub.unibl.org/oai

oai:pub.unibl.org:40791 2024-06-12T14:23:57Z

First Long-term Optical Spectral Monitoring of a Binary Black Hole Candidate E1821+643. I. Variability of Spectral Lines and Continuum /unibl/author/Alla I. Shapovalova /unibl/author/Luka Popović /unibl/author/Vahram Chavushyan /unibl/author/A. N. Burenkov /unibl/author/Dragana Ilić /unibl/author/Wolfram Kollatschny /unibl/author/Andjelka Kovačević /unibl/author/J.R. Valdes /unibl/author/V. Patino-Alvarez /unibl/author/J. Leon-Tavares /unibl/author/J. Torrealba /unibl/author/V.E. Zhdanova 2016-02 Academic Article text 18 1 /unibl/sci/idNaucniRad:18598 https://dx.doi.org/10.3847/0067-0049/222/2/25 ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 0067-0049 https://pub.unibl.org/s/cir/item/40791