BC Cassiopeiae: First detection of IW Andromedae-type phenomenon among post-eruption novae
Abstract
IW And-type dwarf novae are a recently recognized group of cataclysmic variables which are characterized by a sequence of brightening from a standstill-like phase with damping oscillations often followed by a deep dip. We found that the supposed classical nova BC Cas which erupted in 1929 experienced a state of an IW And-type dwarf nova in 2018, 89 yr after the eruption. This finding suggests that a high mass-transfer rate following the nova eruption is associated with the IW And-type phenomenon. The mass of the white dwarf inferred from the decline rate of the nova is considerably higher than the average mass of the white dwarfs in cataclysmic variables, and these massive white dwarfs may be responsible for the manifestation of the IW And-type phenomenon.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- December 2020
- DOI:
- 10.1093/pasj/psaa096
- arXiv:
- arXiv:2009.12993
- Bibcode:
- 2020PASJ...72...98K
- Keywords:
-
- accretion;
- accretion disks;
- stars: dwarf novae;
- stars: individual (BC Cassiopeiae);
- stars: novae;
- cataclysmic variables;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 4 pages, 1 figure, supplementary information (si.pdf), accepted for publication in PASJ