J/MNRAS/388/1198 Be/X-ray binaries in Small Magellanic Cloud (McBride+, 2008)
Spectral distribution of Be/X-ray binaries in the Small Magellanic Cloud.
McBride V.A., Coe M.J., Negueruela I., Schurch M.P.E., McGowan K.E.
<Mon. Not. R. Astron. Soc., 388, 1198-1204 (2008)>
=2008MNRAS.388.1198M 2008MNRAS.388.1198M
ADC_Keywords: Magellanic Clouds ; Binaries, X-ray ; Photometry
Keywords: binaries: general - emission-line, Be - Magellanic Clouds
Abstract:
The spectral distributions of Be/X-ray binaries in the Large
Magellanic Cloud and Galaxy have been shown to differ significantly
from the distribution of isolated Be stars in the Galaxy. Population
synthesis models can explain this difference in spectral distributions
through substantial angular momentum loss from the binary system. In
this work, we explore the spectral distribution of Be/X-ray binaries
in the Small Magellanic Cloud (SMC) using high signal-to-noise ratio
spectroscopy of a sample of 37 optical counterparts to known X-ray
pulsars. Our results show that the spectral distribution of Be/X-ray
binaries in the SMC is consistent with that of the Galaxy, despite the
lower metallicity environment of the SMC. This may indicate that,
although the metallicity of the SMC is conducive to the formation of a
large number of high-mass X-ray binaries, the spectral distribution of
these systems is likely to be most strongly influenced by angular
momentum losses during binary evolution, which are not particularly
dependent on the local metallicity.
Description:
The data were acquired on the nights of 2006 September 13-15 and 2007
September 18 and 19 using the EFOSC2 faint object spectrograph mounted
at the Cassegrain focus of the 3.6-m telescope at La Silla, Chile. We
used a grism with lines ruled at 600mm-1 and which covered the
wavelength range λλ3095-5085Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table24.dat 90 37 Sample and properties of SMC Be/X-ray binary
systems with well-defined optical counterparts
(tables 2 and 4 of the paper)
refs.dat 69 28 References
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Byte-by-byte Description of file:table24.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Source Source name based on the X-ray pulse period
9 A1 --- n_Source [1] Note on Source (1)
11- 31 A21 --- Name Name
33- 35 A3 -- Tel Telescope used to determine the best position
of the source (2)
36 A1 --- n_Tel [2] Note on Tel (1)
38- 43 A6 --- Refs References, in refs.dat file
45- 49 F5.2 mag Vmag V magnitude
51- 54 F4.2 mag e_Vmag rms uncertainty on Vmag
56- 60 F5.2 mag B-V B-V colour index
62- 65 F4.2 mag e_B-V rms uncertainty on B-V
67 A1 --- r_B-V [OMZ] Reference for colour, in refs.dat file
69- 71 I3 mm-1 Grism Ruling, in line/mm of the grism used
73- 82 A10 --- SpType Spectral classifications determined from blue
spectra in this work unless otherwise noted
83 A1 --- r_SpType [abc] Reference for SpType, in refs.dat file
85- 90 A6 --- Lum Luminosity class from this work (3)
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Note (1): Note as follows:
1 = Be counterpart to radio and X-ray pulsar
2 = Two arcsec error circle - no ambiguity in optical counterparts
Note (2): Telescope code as follows:
C = Chandra
X = XMM
A = ASCA
R = ROSAT
O = optical identification by photometry or spectroscopy of
objects within the error circle
Note (3): Luminosity class as determined from the spectrum in the case of
600lines/mm data, and as determined from the absolute magnitude in the
case of 400lines/mm data.
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Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 47 A24 --- Aut Author's name
49- 69 A21 --- Com Comments
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History:
From electronic version of the journal
In table2, RX J0058.8-7272 was corrected into RX J0057.8-7202
(End) Patricia Vannier [CDS] 02-Jan-2010