Long-term optical and X-ray variability of the Be/X-ray binary H 1145-619: discovery of an on-going retrograde density wave

Abstract

Multiwavelength monitoring of Be/X-ray binaries is crucial to understand the mechanisms producing their outbursts. H 1145-619 is one of these systems, which has recently displayed X-ray activity. We investigate the correlation between the optical emission and the X-ray activity to predict the occurrence of new X-ray outbursts from the inferred state of the circumstellar disc. We have performed a multiwavelength study of H 1145-619 from 1973 to 2017 and present here a global analysis of its variability over the last 40 years. We have used optical spectra from the SAAO, SMARTS and SALT telescopes and optical photometry from INTEGRAL/OMC and ASAS. We also used X-ray observations from INTEGRAL/JEM-X, and IBIS to generate the light curves and combined them with Swift/XRT to extract the X-ray spectra. In addition, we have compiled archival observations and measurements from the literature to complement these data. Comparing the evolution of the optical continuum emission with the Halpha line variability, we have identified three different patterns of optical variability: Global increases and decreases of the optical brightness (observed from 1982 to 1994 and from 2009 to 2017) that can be explained by the dissipation and replenishment of the circumstellar disc, superorbital variations with a period of Psuperorb~590 days (observed in 2002-2009) which seems to be related with the circumstellar disc, and optical outbursts (observed in 1998-1999 and 2002-2005) that we interpret as mass ejections. We have discovered the presence of a retrograde one-armed density wave, which appeared in 2016 and is still present in the circumstellar disc. We have carried out the most complete long-term optical study of the Be/X-ray binary H 1145-619 in correlation with its X-ray activity. We found for the fist time the presence of a retrograde density perturbation in the circumstellar disc of a Be/X-ray binary.

arXiv commentAccepted on 2 September 2017, 13 pages, 12 figures

References in corpus (25)

• On the Absorption of X-rays in the Interstellar Medium
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars
• Be/X-ray binaries
• Classical Be Stars: Rapidly Rotating B Stars with Viscous Keplerian Decretion Disks
• A natural explanation for periodic X-ray outbursts in Be/X-ray binaries
• CHIRON - A Fiber Fed Spectrometer for Precise Radial Velocities
• GASS: The Parkes Galactic All-Sky Survey. Update: improved correction for instrumental effects and new data release
• On Be Star Candidates and Possible Blue Pre-Main Sequence Objects in the Small Magellanic Cloud
• Hard Spectra of X-Ray Pulsars from INTEGRAL Data
• A representative sample of Be Stars I: Sample Selection, Spectral Classification and Rotational Velocities
• Very Long-term Optical Variability of High Mass X-ray Binaries in the SMC
• Photometric Variability of the Be Star Population
• First spectro-interferometric survey of Be stars I. Observations and constraints on the disks geometry and kinematics
• The remarkable light and colour variability of Small Magellanic Cloud Be stars
• Precessing Warped Be Disk Triggering the Giant Outbursts in 2009 and 2011 in A 0535+262/V725 Tau
• Cyclical behaviour and disc truncation in the Be/X-ray binary A0535+26
• Long-term optical variability of high-mass X-ray binaries. II. Spectroscopy
• Multiwavelength observations of the Be/X-ray binary 4U1145-619
• A 421 d Activity Cycle in the BeX Recurrent Transient A0538-66 from MACHO monitoring
• The optical counterpart to IGR J06074+2205: a Be/X-ray binary showing disc loss and V/R variability
• Discrete Mass Ejections from the Be/X-ray Binary A0535+26/HD245770
• INTEGRAL observation of the accreting pulsar 1E1145.1-6141
• Using Photometry to Probe the Circumstellar Environment of delta Scorpii
• Long-term Optical Observations of the Be/X-ray Binary X Per

Cited by in corpus (9)

• Optical counterpart to Swift J0243.6+6124
• Catalog of the Galactic population of X-ray pulsars in High-mass X-ray binary systems
• X-ray response to disk evolution in two gamma-Cas stars
• Fast time optical variability in Be/X-ray binaries. Pulsation and rotation
• Long-term optical variability of the Be/X-ray binary GRO J2058+42
• A precessing stellar disk model for superorbital modulations of the gamma-ray binary LS I+61${}^{\circ }$ 303
• Strong Variability in AzV 493, an Extreme Oe-Type Star in the SMC
• Unveiling the origin of the optical/UV emission from the Galactic ULX Swift J0243.6+6124 during its 2017-2018 giant outburst
• An eccentric wave in the circumstellar disc of the Be/X-ray binary X Persei