RT Journal Article
T1 Accretion-disc precession in UX Ursae Majoris
A1 Miguel Agustino, Enrique de
A1 Patterson, Joseph
AB We report the results of a long campaign of time-series photometry on the nova-like variable UX Ursae  Majoris  during  2015.  It  spanned  150  nights,  with  ~  1800  hours  of  coverage  on  121 separate nights. The star was in its normal ‘high state’ near magnitude V = 13, with slow waves in  the  light  curve  and  eclipses  every  4.72  hours.  Remarkably,  the star also showed a nearly sinusoidal signal with a full amplitude of 0.44 mag and a period of 3.680± 0.007 d. We interpret this as the signature of a retrograde precession (wobble) of the accretion disc. The same period is manifest as a ±33 s wobble in the timings of mid-eclipse, indicating that the disc’s centre of light moves with this period. The star also showed strong ‘negative superhumps’ at frequencies ft)orb + N and 2ft)orb + N, where worb and N are respectively the orbital and precession frequencies. It is possible that these powerful signals have been present, unsuspected, throughout the more than 60 years of previous photometric studies.
PB Oxford University Press
SN 0035-8711
SN 1365-2966 (electrónico)
YR 2016
FD 2016
LK http://hdl.handle.net/10272/12243
UL http://hdl.handle.net/10272/12243
LA eng
NO Miguel Agustino, E., Patterson, J... [et al.]: "Accretion-disc precession in UX Ursae Majoris". Monthly Notices of the Royal Astronomical Society.  Vol. 457, n. 2, págs. 1447-1455, (2016). DOI: 10.1093/mnras/stv3014
NO We thank the National Science Foundation for support of this research (AST12-11129),  and  also  the  Mount  Cuba  Astronomical  Foundation.Finally, we thank the American Association of Variable Star Observers (AAVSO)  for  providing  the  infrastructure  and  continued  inspiration which makes programs like this possible.
DS Repositorio Institucional de la Universidad de Huelva
RD 1 jun 2026