The 2011 Periastron Passage of the Be Binary δ Scorpii

  title={The 2011 Periastron Passage of the Be Binary $\delta$ Scorpii},
  author={Anatoly Miroshnichenko and Alexey Pasechnik and N. Manset and Alex C. Carciofi and Th. Rivinius and Stanislav {\vS}tefl and Vasilii V. Gvaramadze and Jos{\'e} Lu{\'i}s Pais Ribeiro and A. Fernando and T. Garrel and Johan H. Knapen and Christian Buil and Bernard Heathcote and Ernst Pollmann and Benjamin Mauclaire and Olivier Thizy and J. C. Martin and S. V. Zharikov and Atsuo T. Okazaki and Thomas L. Gandet and Thomas Eversberg and Niels Reinecke},
  journal={The Astrophysical Journal},
We describe the results of the world-wide observing campaign of the highly eccentric Be binary system δ Scorpii 2011 periastron passage which involved professional and amateur astronomers. Our spectroscopic observations provided a precise measurement of the system orbital period at 10.8092 ± 0.0005 yr. Fitting of the Heii 4686 A line radial velocity curve determined the periastron passage time on 2011 July 3, UT 9:20 with a 0.9-day uncertainty. Both these results are in a very good agreement… 

Figures and Tables from this paper

Doppler tomography of the circumstellar disk of π Aquarii
Aims. The work is aimed at studying the circumstellar disk of the bright classical binary Be star p Aqr. Methods. We analysed variations of a double-peaked profile of the Ha emission line in the
Prevalence of SED Turndown among Classical Be Stars: Are All Be Stars Close Binaries?
Rapid rotation is a fundamental characteristic of classical Be stars and a crucial property allowing for the formation of their circumstellar disks. Past evolution in a mass and angular momentum
Was the nineteenth century giant eruption of Eta Carinae a merger event in a triple system
We discuss the events that led to the giant eruption of Eta Carinae, and find that the mid-nineteenth century (in 1838-1843) giant mass-loss outburst has the characteristics of being produced by the
Epilogue: Small Telescopes Everywhere
In January 2009, the relatively brief periastron passage of the long-period Wolf-Rayet + O binary star WR 140 took place, long awaited by stellar-wind astronomers. Thomas discussed this event with
Photometric Variability of the Be Star Population
Be stars have generally been characterized by the emission lines in their spectra, and especially the time variability of those spectroscopic features. They are known to also exhibit photometric
Disk-loss and disk-renewal phases in classical Be stars. II. Contrasting with stable and variable disks
Recent observational and theoretical studies of classical Be stars have established the utility of polarization color diagrams (PCDs) in helping to constrain the time-dependent mass decretion rates
Off-the-shelf Echelle Spectroscopy: Two Devices on the Test Block
Today, various Echelle spectrographs for small telescopes are available on the market. These instruments are ready-to-use, including professional data reduction chains. Manufacturers claim that their
Stellar Spectroscopy Technique on Small- and Intermediate-Diameter Telescopes
Abstract —We briefly present the history of technical solutions aimed at improving the efficiency of spectroscopy on small- and moderate-diameter telescopes. We assess the current state of
Investigating the lack of main-sequence companions to massive Be stars
Context. About 20% of all B-type stars are classical Be stars – stars whose spectra imply the presence of a circumstellar decretion disk. The disk phenomenon is strongly correlated with rapid


Spectroscopic observations of the δ Scorpii binary during its recent periastron passage
The bright star Delta Sco has been considered a typical B0-type object for many years. Spectra of the star published prior to 1990 showed no evidence of emission, but only of short-term line profile
A new determination of the orbit and masses of the Be binary system δ Scorpii
The binary starδ Sco (HD143275) underwent remarkable brightening in the visible in 2000, and continues to be irregularly variable. The system was observed with the Sydney University Stellar
Imaging Disk Distortion of Be Binary System δ Scorpii near Periastron
The highly eccentric Be binary system {delta} Sco reached periastron during early 2011 July, when the distance between the primary and secondary was a few times the size of the primary disk in the H
Properties and nature of Be stars - 29. Orbital and long-term spectral variations of γ Cassiopeiae
A detailed analysis of more than 800 electronic high-resolution spectra of gamma Cas, which were obtained during a time interval of over 6000 days (16.84 yr) at several observatories, documents the
The binary Be star δ Sco at high spectral and spatial resolution: Disk geometry and kinematics before the 2011 periastron
Classical Be stars are hot non-supergiant stars surrounded by a gaseous circumstellar disk that is responsible for the observed IR-excess and emission lines. The influence of binarity on these
Implications of Systematic Observations for the Nature of the Multiple System with the Be star o Cassiopeae and its Circumstellar Environment
Abstract : The analysis of radial velocities of the Be star o Cas from spectra taken between 1992 and 2008 at the Ondrejov Observatory and the Dominion Astrophysical Observatory allowed us to
Properties of the δ Scorpii Circumstellar Disk from Continuum Modeling
We present optical W BV R and infrared JHKL photometric observations of the Be binary system d Sco, obtained in 2000–2005, mid-infrared (10 and 18 µm) photometry and optical (?? 3200–10500 ^A)
A Study of π Aquarii during a Quasi-normal Star Phase: Refined Fundamental Parameters and Evidence for Binarity
We present the results of recent multicolor photometric and high-resolution spectroscopic observations of the bright Be star Pi Aquarii. Observational data collected from the literature were used to
Massive runaway stars in the Small Magellanic Cloud
Using archival Spitzer Space Telescope data, we identified for the first time a dozen runaway OB stars in the Small Magellanic Cloud (SMC) through the detection of their bow shocks. The geometry of
Toward Complete Statistics of Massive Binary Stars: Penultimate Results from the Cygnus OB2 Radial Velocity Survey
We analyze orbital solutions for 48 massive multiple-star systems in the Cygnus OB2 Association, 23 of which are newly presented here, to find that the observed distribution of orbital periods is