Zsidi, G. orcid.org/0000-0002-4612-5824, Nixon, C.J. orcid.org/0000-0002-2137-4146, Naylor, T. et al. (2 more authors) (2023) A trio of month-long flares in the nova-like variable V704 And. Astronomy & Astrophysics, 679. L3. ISSN 0004-6361
Abstract
We present the discovery of an unusual set of flares in the nova-like variable V704 And. Using data from AAVSO, ASAS-SN, and ZTF for the nova-like variable V704 And, we discovered a trio of brightening events that occurred during the high state. These events elevate the optical brightness of the source from ∼13.5 to ∼12.5 mag. The events last for roughly a month, and exhibit the unusual shape of a slow rise and faster decay. Immediately after the third event, we obtained data from regular monitoring with Swift, although by this time the flares had ceased and the source returned to its pre-flare level of activity in the high state. The Swift observations confirm that during the high state, the source is detectable in the X-rays, and provide simultaneous UV and optical fluxes. As the source is already in the high state prior to the flares, and therefore the disc is expected to already be in the high-viscosity state, we conclude that the driver of the variations must be changes in the mass transfer rate from the companion star and we discuss mechanisms that could lead to such short-timescale mass-transfer variations.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © The Authors 2023. This is an open access article under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. |
Keywords: | stars: individual: V704 And; accretion; accretion disks; novae; cataclysmic variables |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) |
Funding Information: | Funder Grant number Leverhulme Trust RPG-2021-380 STFC (Science and Technology Facilities Council) ST/Y000544/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 13 Dec 2023 10:16 |
Last Modified: | 13 Dec 2023 10:16 |
Status: | Published |
Publisher: | EDP Sciences |
Identification Number: | 10.1051/0004-6361/202346882 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:206550 |