J/A+A/408/305 Spectroscopic observations of delta Sco (Miroshnichenko+, 2003)
Spectroscopy of the growing circumstellar disk in the δ Scorpii Be binary.
Miroshnichenko A.S., Bjorkman K.S., Morrison N.D., Wisniewski J.P.,
Manset N., Levato H., Grosso M., Pollmann E., Buil C., Knauth D.C.
<Astron. Astrophys. 408, 305 (2003)>
=2003A&A...408..305M 2003A&A...408..305M
ADC_Keywords: Binaries, spectroscopic ; Equivalent widths
Keywords: techniques: spectroscopic - stars: circumstellar matter -
stars: individual: delta Scorpii - stars: binaries: spectroscopic -
stars: Be stars
Abstract:
We present the results of a spectroscopic monitoring program of the
binary system Scorpii, whose primary became a Be star after the last
periastron encounter in the Summer of 2000. The observations cover a
period of 2 years (March 2001-June 2003) and are a continuation of
our previous campaign reported in Miroshnichenko et al.
(2001A&A...377..485M 2001A&A...377..485M). We found that the emission-line spectrum was
gradually strengthening over the whole monitoring period. Several
short-term increases of the line emission, possibly due to outbursts
of matter ejected from the stellar surface, were detected. The
outbursts seem to be responsible for the brightness fadings, seen
afterwards. We attempt to explain the overall observed line and
continuum behaviour in terms of a circumstellar disk, growing in
density and size. The disk is most likely Keplerian with an outer
radius of and a mean expansion speed of ∼0.4km/s.
Description:
Our new spectroscopic observations of δ Sco were carried out
between March 2001 and June 2003 using a number of instruments at
different observatories, Ritter Observatory (Toledo, OH, USA),
McDonald Observatory (Mt. Locke, Texas, USA), CFHT (Hawaii, USA)
and Observatory of the Cologne-Stargazer s Association.
Objects:
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RA (2000) DE Designation(s)
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16 00 20 -22 37.3 delta Sco = HD 143275
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 115 Summary of the high-resolution Hα
observations of δ Sco
table2.dat 12 66 Summary of the low-resolution Hα
observations of δ Sco.
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Heliocentric Julian date
13 A1 --- Site [RLCM] Site of observation (1)
15- 19 F5.2 0.1nm EW Line equivalent width
21- 24 F4.2 --- Bint Intensity of the blue emission peak (2)
25 A1 --- --- [/]
26- 29 F4.2 --- Rint Intensity of the red emission peak (2)
30 A1 --- --- [/]
31- 34 F4.2 ---- CDint ? Intensity of the central depression (2)
36- 39 F4.1 km/s RV ? Radial velocity of the wings
40 A1 --- u_RV Uncertainty flag on RV
42- 44 I3 km/s PeakSep ? Peak separation (3)
45 A1 --- u_PeakSep Uncertainty flag on PeakSep
47- 49 I3 km.s FWHM Full width at half-maximum
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Note (1): Site of observation:
R: Ritter Obs.
L: Leoncito
C: CFHT
M: McDonald
Note (2): The intensities are normalized to the underlying continuum
Note (3): The peak separation is a measure of the outer radius of the
emitting disk (ΔRV/2vsini=(Rdisk/R*)-j), where j=0.5
corresponds to Keplerian rotation and J=1 to conservation of angular
momentum.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- MJD Modified Julian date
6 A1 --- Site [GF] Observing site (F: France; G: Germany)
8- 11 F4.1 0.1nm EW Line equivalent width
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History:
From electronic version of the journal
(End) Patricia Bauer [CDS] 25-Aug-2003