J/A+A/560/A30 Hα spectra of π Aqr (Zharikov+, 2013)
Doppler tomography of the circumstellar disk of pi Aquarii.
Zharikov S., Miroshnichenko A.S., Pollmann E., Danford S., Bjorkman K.S.,
Morrison N.D., Favaro A., Guarro Flo J., Terry J.N., Desnoux V., Garrel T.,
Martineau G., Buchet Y., Ubaud S., Mauclaire B., Kalbermatten H., Buil C.,
Sawicky C.J., Blank T., Garde O.
<Astron. Astrophys. 560, A30 (2013)>
=2013A&A...560A..30Z 2013A&A...560A..30Z
ADC_Keywords: Binaries, spectroscopic ; Stars, Be ; Spectroscopy
Keywords: binaries: spectroscopic - circumstellar matter -
stars: emission-line, Be - stars: individual: pi Aquarii -
techniques: spectroscopic
Abstract:
The work is aimed at studying the circumstellar disk of the bright
classical binary Be star pi Aqr. We analysed variations of a
double-peaked profile of the Halpha emission line in the spectrum of
pi Aqr that was observed in many phases during ∼40 orbital cycles in
2004-2013. We applied the discrete Fourier transform (DFT) method to
search for periodicity in the peak intensity ratio (V/R). Doppler
tomography was used to study the structure of the disk around the
primary. The dominant frequency in the power spectrum of the Halpha
V/R ratio is 0.011873d-1, which corresponds to a period of 84.2(2)
days and agrees with the earlier determined orbital period of the
system Porb=84.1d. The V/R shows a sinusoidal variation that is
phase-locked with the orbital period. Doppler maps of all our spectra
show a non-uniform structure of the disk around the primary: a ring
with the inner and outer radii at Vin∼450km/s and Vout∼200km/s,
respectively, along with an extended stable region (spot) at
Vx∼225km/s and Vy∼100km/s. The disk radius of ∼65R☉=0.33AU was
estimated by assuming Keplerian motion of a particle on a circular
orbit at the disk's outer edge.
Description:
Table 1: Dates of observations of pi Aqr (HJD), the source (ID), and
results of V/R and EW measurements of the Halpha emission line.
spectra/* : Archive of all presented spectra in FITS format.
The wavelength is given in Angstrom. The continuum is normalized to
unit.
Objects:
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RA (2000) DE Designation(s)
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2 25 16.62 +01 22 38.6 pi Aqr = * 52 Aqr
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 286 The dates of observations of π Aqr, the source,
and measurements of the Hα emission line
table1.fits 2880 5 FITS version of table1
spectra/* . 282 Individual FITS spectra
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See also:
J/ApJ/709/1306 : Spectropolarimetry of 60 Cyg and π Aqr (Wisniewski+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 d HJD Heliocentric Julian Date of observation
(2004-08-22 to 2013-10-05)
12- 15 F4.2 --- V/R Hα Violet/Red intensity ratio
(V/R=IV/IR)
17- 21 F5.2 0.1nm EWHa ? Hα equivalent width
23 I1 --- Ref [1/3] Reference of the observation (1)
25- 39 A15 --- FileName Name of the FITS spectrum in subdirectory
"spectra"
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Note (1): References as follows:
1 = Ritter Observatory
2 = amateur data
3 = Three College Observatory
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Acknowledgements:
Sergey Zharikov, zhar(at)astrosen.unam.mx
(End) Sergey Zharikov [OAN IA UNAM, Mexico], Patricia Vannier [CDS] 12-Nov-2013