Spectroscopic observations of the δ Scorpii binary during its recent periastron passage

Мирошниченко, А. С.; Fabregat, J.; Bjorkman, K. S.; Knauth, D. C.; Morrison, N. D.; Tarasov, A. E.; Reig, P.; Negueruela, I.; Blay, P.

doi:10.1051/0004-6361:20010911

Cited by 64 publications

(116 citation statements)

References 24 publications

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“…5 and 6. The He 5876Å line is very weak but this is similar to the findings of Miroshnichenko et al (2001). Hβ emission was also found to be rather weak.…”

Section: Resultssupporting

confidence: 85%

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Near infra-red and optical spectroscopy of Delta Scorpii

Banerjee

Janardhan

Ashok

2001

A&A

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Abstract. Spectroscopic observations of δ Sco in the near IR and optical wavelengths, obtained shortly after its recent periastron passage are reported. The IR spectra are dominated by the HI Paschen and Brackett lines. An IR excess is seen which can be attributed to free-free emission from a circumstellar shell. The observed Paschen and Brackett line intensities deviate significantly from Case B predictions and indicate optical depth effects. These effects are modeled. The overall spectral behaviour of δ Sco at present is that of a typical Be star.

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“…5 and 6. The He 5876Å line is very weak but this is similar to the findings of Miroshnichenko et al (2001). Hβ emission was also found to be rather weak.…”

Section: Resultssupporting

confidence: 85%

“…Spectroscopic observations of δ Sco during its recent periastron passage were done extensively by Miroshnichenko et al (2001) between July 2000 and March 2001. These authors have used their spectroscopic data to refine the orbital elements of δ Sco and also discuss possible mechanisms for the mass loss and line emission from the star.…”

Section: Introductionmentioning

confidence: 99%

Near infra-red and optical spectroscopy of Delta Scorpii

Banerjee

Janardhan

Ashok

2001

A&A

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“…It is known that companions can influence the circumstellar disks of Be stars in several ways: affecting the global disk oscillations (Oktariani & Okazaki 2009), truncating the outer disk (Carciofi et al 2009), and even extracting material from the central star in eccentric orbits (Miroshnichenko et al 2001;Kervella et al 2008). The latter authors found that the orbital period of the close companion of Achernar (HD 10144) appears similar to the observed pseudo-periodicity of the Be phenomenon, indicating that an interaction between the components at periastron could be triggering the Be episodes.…”

Section: Discussionmentioning

confidence: 99%

The discovery of a shell-like event in the O-type star HD 120678

Gamen

Arias

Barbá

et al. 2012

A&A

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Aims. We report the detection of a shell-like event in the Oe-type star HD 120678. Methods. HD 120678 has been intensively observed as part of a high-resolution spectroscopic monitoring program of southern Galactic O stars and Wolf-Rayet stars of the nitrogen sequence.Results. An optical spectrogram of HD 120678 obtained in June 2008 shows strong H and He i absorption lines instead of the double-peaked emission profiles observed both previously and subsequently, as well as a variety of previously undetected absorption features, mainly of O ii, Si iii and Fe iii. Photometric data reveal that the development of the absorption spectrum coincided with a remarkable dip in the V-band lightcurve. The "shell phase" of HD 120678 did not persist for very long: the V magnitude recovered its previous average value in fewer than 120 days, whereas H and He emission lines became detectable one year later. Similar spectral variations have been observed in a few Be stars, and they are usually interpreted as changes in the circumstellar disk.

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“…In these cases, as the disk cannot easily change size because of the truncation radius, changes in mass loss from the Be star produce changes in the disk density, which can even become optically thick at IR wavelengths. In this case, the IR magnitudes and the H equivalent width are more related to the disk density than to the disk radius (see, e.g., Miroshnichenko et al 2001). Although there was a gap with no measurements from MJD 47,106 to 48,565 (1987November-1991, the magnitudes in all three bands remained at the same level from near the end of the giant outburst observed with EXOSAT until about MJD 49,000 (1993 January).…”

Section: Optical/ir Observationsmentioning

confidence: 96%

A Decade in the Life of EXO 2030+375: A Multiwavelength Study of an Accreting X‐Ray Pulsar

Wilson

Finger

Coe

et al. 2002

ApJ

Self Cite

155

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Using BATSE and RXTE observations from 1991 April to 2001 August, we have detected 71 outbursts from 82 periastron passages of EXO 2030+375, a 42 s transient X-ray pulsar with a Be star companion, including several outbursts from 1993 August to 1996 April, when the source was previously believed to be quiescent. Combining BATSE, RXTE, and EXOSAT data, we have derived an improved orbital solution. Applying this solution results in a smooth profile for the spin-up rate during the giant outburst and results in evidence for a correlation between the spin-up rate and observed flux in the brighter BATSE outbursts. Infrared and H measurements show a decline in the density of the circumstellar disk around the Be star. This decline is followed by a sudden drop in the X-ray flux and a turnover from a spin-up trend to spin-down in the frequency history. This is the first Be/X-ray binary that shows an extended interval, about 2.5 yr, in which the global trend is spin-down, but the outbursts continue. In 1995 the orbital phase of EXO 2030+375's outbursts shifted from peaking about 6 days after periastron to peaking before periastron. The outburst phase slowly recovered to peaking at about 2.5 days after periastron. We interpret this shift in orbital phase followed by a slow recovery as evidence of a global one-armed oscillation propagating in the Be disk. This is further supported by changes in the shape of the H profile, which are commonly believed to be produced by a reconfiguration of the Be disk. The truncated viscous decretion disk model provides an explanation for the long series of normal outbursts and the evidence of an accretion disk in the brighter normal outbursts. Longterm multiwavelength observations such as these clearly add considerably to our knowledge of Be/X-ray binaries and the relationship among optical, infrared, and X-ray observations.

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Spectroscopic observations of the δ Scorpii binary during its recent periastron passage

Cited by 64 publications

References 24 publications

Near infra-red and optical spectroscopy of Delta Scorpii

Near infra-red and optical spectroscopy of Delta Scorpii

The discovery of a shell-like event in the O-type star HD 120678

A Decade in the Life of EXO 2030+375: A Multiwavelength Study of an Accreting X‐Ray Pulsar

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