J/ApJ/723/1469 Flux calibrations and WZ Oph photometry (Wilson+, 2010)
Flux calibrations from nearby eclipsing binaries and single stars.
Wilson R.E., Van Hamme W., Terrell D.
<Astrophys. J., 723, 1469-1492 (2010)>
=2010ApJ...723.1469W 2010ApJ...723.1469W
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI ; Photometry, uvby ;
Stars, nearby
Keywords: binaries: close - binaries: eclipsing - binaries: spectroscopic -
stars: distances
Abstract:
Among several EB distance algorithms, direct comparison of observed
and theoretical fluxes is particularly straightforward, although it
requires absolute flux calibrations for which only a modest number of
publications exist. Here, we measure UBV RI and uvby flux calibrations
and calibration ratios from astronomical objects in ways not
previously tried, specifically for EBs, single stars within 80pc, and
the Sun. All of the single stars are below about 6500K temperature.
Interstellar extinction is avoided by a restriction to nearby targets.
Some photometric band calibrations in the literature are accurate
enough for very good EB distance determinations if star temperatures
are accurately known, especially considering that estimated distance
has only a square-root dependence on calibration constant, but
accurate band-to-band calibration ratios are keys to the combined
temperature-distance problem. Band-independent canceling factors (star
radii and distances) allow calibration ratio measurement with enhanced
accuracy, compared to individual band calibrations. A physical EB
model with embedded stellar atmosphere emission optimally matches
theory to observations for the binaries. Single star candidates are
identified as reliably single if their radial velocity variations are
below 100m/s. For the most part, we find good agreement with some of
the previous calibrations and the ratios are improved.
Description:
WZ Oph was observed on 28 nights in 2008 May and June with the 0.4m
Schmidt-Cassegrain telescope at Sonoita Research Observatory (SRO) in
Sonoita, AZ.
Objects:
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RA (2000) DE Designation(s) (Orbit Period)
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17 06 39.04 +07 46 57.8 WZ Oph = SBC9 944 (P=4.18)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 141 829 *Cband's and Cband ratios for individual stars
table14.dat 40 751 New WZ Oph photometric observations
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Notes on table2.dat:
Rows 1-462 (set 1): Stromgren uvby (1=u, 2=v, 3=b, 4=y);
Rows 463-772 (set 2): Johnson UBV (1=U, 2=B, 3=V);
Rows 773-829 (set 3): Johnson UBVRI (1=U, 2=B, 3=V, 4=RC, 5=IC).
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See also:
V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
V/121 : Catalog of DMS-type eclipsing binaries (Svechnikov+, 1999)
II/215 : uvby-beta Catalogue (Hauck+ 1997)
II/183 : UBVRI Photometric Standards (Landolt 1992)
II/116 : Photoelectric Photometry in Johnson UBVRI System (Lanz 1986)
J/A+A/498/527 : Calibration of Stromgren phot. for late-type stars (Onehag+,
2009)
J/AJ/137/4186 : UBVRI standards around celestial equator (Landolt, 2009)
J/A+A/487/1081 : uvby photometry of 6 eclipsing binaries (Clausen+, 2008)
J/A+A/487/1095 : Radial velocities of AD Boo, VZ Hya, WZ Oph (Clausen+, 2008)
J/PASP/120/1128 : Calibrated griz magnitudes of Tycho star (Ofek, 2008)
J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)
J/AJ/133/2502 : UBVRI Standard Stars (Landolt, 2007)
J/MNRAS/373/13 : Lower MS stars fundamental param. (Casagrande+, 2006)
J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)
J/ApJ/652/313 : BV phot. of a detached EB in M 33 (Bonanos+, 2006)
J/AJ/129/1642 : Calibration of synthetic photometry (Fitzpatrick+, 2005)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD Star HD Number
7- 15 F9.5 dW/m3 C1 ?=99.99999 Band 1 Calibration; in erg/s/cm3
16- 24 F9.5 dW/m3 C2 ?=99.99999 Band 2 Calibration; in erg/s/cm3
25- 33 F9.5 dW/m3 C3 ?=99.99999 Band 3 Calibration; in erg/s/cm3
34- 42 F9.5 dW/m3 C4 ?=99.99999 Band 4 Calibration; in erg/s/cm3
43- 51 F9.5 dW/m3 C5 ?=99.99999 Band 5 Calibration; in erg/s/cm3
52- 60 F9.5 --- C1/C2 ?=99.99999 Band Calibration Ratio
61- 69 F9.5 --- C1/C3 ?=99.99999 Band Calibration Ratio
70- 78 F9.5 --- C1/C4 ?=99.99999 Band Calibration Ratio
79- 87 F9.5 --- C1/C5 ?=99.99999 Band Calibration Ratio
88- 96 F9.5 --- C2/C3 ?=99.99999 Band Calibration Ratio
97-105 F9.5 --- C2/C4 ?=99.99999 Band Calibration Ratio
106-114 F9.5 --- C2/C5 ?=99.99999 Band Calibration Ratio
115-123 F9.5 --- C3/C4 ?=99.99999 Band Calibration Ratio
124-132 F9.5 --- C3/C5 ?=99.99999 Band Calibration Ratio
133-141 F9.5 --- C4/C5 ?=99.99999 Band Calibration Ratio
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Byte-by-byte Description of file: table14.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 --- HJD Heliocentric Julian Date of observation
13- 19 F7.3 mag Bmag B band magnitude
20- 26 F7.3 mag Vmag V band magnitude
27- 33 F7.3 mag Rcmag Rc band magnitude
34- 40 F7.3 mag Icmag Ic band magnitude
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-Jul-2012