The University of Southampton
University of Southampton Institutional Repository

Long-term optical and X-ray variability of the Be/X-ray binary H 1145–619: Discovery of an ongoing retrograde density wave

Long-term optical and X-ray variability of the Be/X-ray binary H 1145–619: Discovery of an ongoing retrograde density wave
Long-term optical and X-ray variability of the Be/X-ray binary H 1145–619: Discovery of an ongoing retrograde density wave
Context. 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.
Aims. We investigate the correlation between the optical emission and X-ray activity to predict the occurrence of new X-ray outbursts from the inferred state of the circumstellar disc.
Methods. 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 yr. We used optical spectra from the SAAO, SMARTS, and SALT telescopes and optical photometry from the Optical Monitoring Camera (OMC) onboard INTEGRAL and from the All Sky Automated Survey (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 compiled archival observations and measurements from the literature to complement these data.
Results. Comparing the evolution of the optical continuum emission with the Hα line variability, we identified three different patterns of optical variability: first, global increases and decreases of the optical brightness, observed from 1982 to 1994 and from 2009 to 2017, which can be explained by the dissipation and replenishment of the circumstellar disc; second, superorbital variations with a period of Psuperorb ≈ 590 days, observed in 2002–2009, which seems to be related to the circumstellar disc; and third, optical outbursts, observed in 1998–1999 and 2002–2005, which we interpret as mass ejections from the Be star. We discovered the presence of a retrograde one-armed density wave, which appeared in 2016 and is still present in the circumstellar disc.
Conclusions. We 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. For the first time, we found the presence of a retrograde density perturbation in the circumstellar disc of a Be/X-ray binary.
0004-6361
Alfonso-Garzon, J.
96399e58-5a8c-4073-b54a-376102ca829f
Fabregat, J.
56633b5f-ba82-45c2-bfb2-b2e30bfdd92e
Reig, P.
66ae1b8d-9c4b-449d-a459-6e8382a5986b
Kajava, J.J.E.
9369f181-1108-4d22-aa1a-9645dbc9e74a
Sanchez-Dernandez, C.
a5fcf486-9570-4a37-a11f-7ad1c42311ef
Townsend, L.J.
383d1487-54d3-4912-82d3-1cc3b4b28d5e
Mas-Hesse, J.M.
46b66c16-ab4b-442d-b109-69aaa0dd51d0
Crawford, S.M.
3e4dc34c-0da9-40c9-b94c-1e60b12ff970
Kretschmar, P.
8a304252-aa93-41d3-a891-28aa9705b9ce
Coe, M.J.
04dfb23b-1456-46a3-9242-5cee983471d5
Alfonso-Garzon, J.
96399e58-5a8c-4073-b54a-376102ca829f
Fabregat, J.
56633b5f-ba82-45c2-bfb2-b2e30bfdd92e
Reig, P.
66ae1b8d-9c4b-449d-a459-6e8382a5986b
Kajava, J.J.E.
9369f181-1108-4d22-aa1a-9645dbc9e74a
Sanchez-Dernandez, C.
a5fcf486-9570-4a37-a11f-7ad1c42311ef
Townsend, L.J.
383d1487-54d3-4912-82d3-1cc3b4b28d5e
Mas-Hesse, J.M.
46b66c16-ab4b-442d-b109-69aaa0dd51d0
Crawford, S.M.
3e4dc34c-0da9-40c9-b94c-1e60b12ff970
Kretschmar, P.
8a304252-aa93-41d3-a891-28aa9705b9ce
Coe, M.J.
04dfb23b-1456-46a3-9242-5cee983471d5

Alfonso-Garzon, J., Fabregat, J., Reig, P., Kajava, J.J.E., Sanchez-Dernandez, C., Townsend, L.J., Mas-Hesse, J.M., Crawford, S.M., Kretschmar, P. and Coe, M.J. (2017) Long-term optical and X-ray variability of the Be/X-ray binary H 1145–619: Discovery of an ongoing retrograde density wave. Astronomy & Astrophysics, 607, [A52]. (doi:10.1051/0004-6361/201630211).

Record type: Article

Abstract

Context. 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.
Aims. We investigate the correlation between the optical emission and X-ray activity to predict the occurrence of new X-ray outbursts from the inferred state of the circumstellar disc.
Methods. 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 yr. We used optical spectra from the SAAO, SMARTS, and SALT telescopes and optical photometry from the Optical Monitoring Camera (OMC) onboard INTEGRAL and from the All Sky Automated Survey (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 compiled archival observations and measurements from the literature to complement these data.
Results. Comparing the evolution of the optical continuum emission with the Hα line variability, we identified three different patterns of optical variability: first, global increases and decreases of the optical brightness, observed from 1982 to 1994 and from 2009 to 2017, which can be explained by the dissipation and replenishment of the circumstellar disc; second, superorbital variations with a period of Psuperorb ≈ 590 days, observed in 2002–2009, which seems to be related to the circumstellar disc; and third, optical outbursts, observed in 1998–1999 and 2002–2005, which we interpret as mass ejections from the Be star. We discovered the presence of a retrograde one-armed density wave, which appeared in 2016 and is still present in the circumstellar disc.
Conclusions. We 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. For the first time, we found the presence of a retrograde density perturbation in the circumstellar disc of a Be/X-ray binary.

Text
Long-term optical and X-ray variability of the Be/X-ray binary - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 2 September 2017
e-pub ahead of print date: 10 November 2017

Identifiers

Local EPrints ID: 416327
URI: http://eprints.soton.ac.uk/id/eprint/416327
ISSN: 0004-6361
PURE UUID: 84a2b35c-268f-4024-97a7-4858fed9b48f
ORCID for M.J. Coe: ORCID iD orcid.org/0000-0002-0763-8547

Catalogue record

Date deposited: 13 Dec 2017 17:30
Last modified: 20 Jul 2019 01:28

Export record

Altmetrics

Contributors

Author: J. Alfonso-Garzon
Author: J. Fabregat
Author: P. Reig
Author: J.J.E. Kajava
Author: C. Sanchez-Dernandez
Author: L.J. Townsend
Author: J.M. Mas-Hesse
Author: S.M. Crawford
Author: P. Kretschmar
Author: M.J. Coe ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×