Changes in the Period of Negative Superhumps of Type SU UMa Dwarf Novae. II. NY Her (2017 and 2020)

Photometric studies of the type SU UMa dwarf nova NY Her were made during 2017 and 2020 at the Crimean Astrophysical Observatory and at the Sanglokh Observatory over a total of 77 nights. These observations covered two superoutbursts, four normal outbursts, and the quiescent state between them. In 2...

Full description

Saved in:
Bibliographic Details
Published in:Astrophysics 2021-09, Vol.64 (3), p.293-305
Main Authors: Pavlenko, E. P., Sosnovskii, A. A., Antonyuk, K. A., Antonyuk, O. I., Pit’, N. V., Kokhirova, G. I., Rakhmatullaeva, F. J., Baklanov, A. V.
Format: Article
Language:English
Subjects:
Accretion
Accretion disks
Amplitudes
Astronomy
Astrophysical observatories
Astrophysics
Astrophysics and Astroparticles
Astrophysics and Cosmology
Cataclysmic variable stars
Dwarf novae
Natural history
Observations
Observations and Techniques
Observatories
Outbursts
Physics
Physics and Astronomy
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Superhumps (astronomy)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Photometric studies of the type SU UMa dwarf nova NY Her were made during 2017 and 2020 at the Crimean Astrophysical Observatory and at the Sanglokh Observatory over a total of 77 nights. These observations covered two superoutbursts, four normal outbursts, and the quiescent state between them. In 2017 the supercycle was 62 days, and the cycle, 13-14 days. Positive superhumps with an average period of 0.07594 days and a variable amplitude not exceeding 0 m .15 were observed during the superoutbursts. In the quiescent state between outbursts, as well as in the ascending and descending branches of the normal outbursts, negative superhumps with an average period of 0.071269 days were recorded. Their amplitude ranged over 0 m .3-1 m .5 in the quiescent state. The period of the negative superhumps manifested cyclical increases between normal outbursts, which is consistent with the prediction of a cyclical change in the radius of the accretion disk in terms of the thermal-tidal theory of the instability.
ISSN:0571-7256
1573-8191
DOI:10.1007/s10511-021-09690-3