J/AJ/131/633 A ROSAT survey of contact binary stars (Geske+, 2006)
A ROSAT survey of contact binary stars.
Geske M.T., Gettel S.J., McKay T.A.
<Astron. J., 131, 633-637 (2006)>
=2006AJ....131..633G 2006AJ....131..633G
ADC_Keywords: Binaries, eclipsing ; X-ray sources
Keywords: binaries: close - binaries: eclipsing - stars: activity -
stars: variables: other - X-rays: stars
Abstract:
Contact binary stars are common variable stars that are all believed
to emit relatively large fluxes of X-rays. In this work we combine a
large new sample of contact binary stars derived from the ROTSE-I
telescope (Cat. J/AJ/131/621) with X-ray data from the ROSAT All Sky
Survey (RASS, Cat. IX/10) to estimate the X-ray volume emissivity of
contact binary stars in the Galaxy. We obtained X-ray fluxes for 140
contact binaries from the RASS, as well as two additional stars
observed by the XMM-Newton observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 140 Properties of RASS objects in the contact binary
catalog
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
J/AJ/119/1901 : ROTSE all-sky surveys for variable stars (Akerlof+, 2000)
J/AJ/131/621 : A catalog of 1022 bright contact binary stars (Gettel+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [1RXS]
6- 21 A16 --- 1RXS Object name (1RXS JHHMMSS.s-DDMMSS)
23- 31 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) (1)
33- 42 F10.6 deg DEdeg Declination in decimal degrees (J2000) (1)
44- 51 F8.6 d Per Period
53- 55 I3 pc Dist Distance
57- 64 F8.6 ct/s CRate Observed count rate in 0.1-2.0keV band
66- 70 F5.2 --- HR Hardness ratio (2)
72- 75 F4.1 [10-7W] logL Log of the (0.1-2keV) luminosity in units
of erg/s
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Note (1): Taken from the corresponding NSVS observations, due to the better
spatial resolution.
Note (2): HR=(H-S)/(H+S) where H denotes the source count in the hard
passband (0.5-2.0keV), and S denotes the source count in the soft
passband (0.1-0.4keV).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 09-Jan-2007