J/A+A/666/A23 HD 93206 = QZ Carinae UBVRI photometry (Mayer+, 2022)
Towards a consistent model of the hot quadruple system HD 93206 = QZ Carinae.
I. Observations and their initial analyses.
Mayer P., Harmanec P., Zasche P.. Broz M., Catalan-Hurtado R., Barlow B.N.,
Frondorf W., Wolf M., Drechsel H., Chini R., Nasseri A., Pigulski A.,
Labadie-Bartz J., Christie G.W., Walker W.S.G., Blackford M., Blane D.,
Henden A.A., Bohlsen T., Bozic H., Jonak J.
<Astron. Astrophys. 666, A23 (2022)>
=2022A&A...666A..23M 2022A&A...666A..23M (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: eclipsing - stars: early-type -
stars: fundamental parameters -
stars: individual: HD 93206 (QZ Carinae)
Abstract:
The hot nine-component system HD 93206, which contains
a gravitationally bounded eclipsing Ac1+Ac2 binary (P=5.9987d) and
a spectroscopic Aa1+Aa2 (P=20.734d) binary can provide important
insights into the origin and evolution of massive stars. Using
archival and new spectra, and a rich collection of ground-based and
space photometric observations, we carried out a detailed study of
this object. We provide a much improved description of both short
orbits and a good estimate of the mutual period of both binaries of
about 14500d (i.e. 40 years). For the first time, we detected weak
lines of the fainter component of the 6.0d eclipsing binary in the
optical region of the spectrum, measured their radial velocities, and
derived a mass ratio of MAc2/MAc1=1.29, which is the opposite of
what was estimated from the International Ultraviolet explorer (IUE)
spectra. We confirm that the eclipsing subsystem Ac is semi-detached
and is therefore in a phase of large-scale mass transfer between its
components. The Roche-lobe filling and spectroscopically brighter
component Ac1 is the less massive of the two and is eclipsed in the
secondary minimum. We show that the bulk of the Hα emission, so
far believed to be associated with the eclipsing system, moves with
the primary O9.7 I component Aa1 of the 20.73d spectroscopic binary.
However, the weak emission in the higher Balmer lines seems to be
associated with the accretion disc around component Ac2. We
demonstrate that accurate masses and other basic physical properties
including the distance of this unique system can be obtained but
require a more sophisticated modelling. A first step in this direction
is presented in the accompanying Paper II
(Broz et al., 2022A&A...666A..24B 2022A&A...666A..24B).
Description:
Individual ground-based photometric observations of QZ Car from
different observing stations. Individual observing stations are
identified by numerical codes defined in Table 5 of the paper. Values
99.999 stand for missing observations.
Objects:
-----------------------------------------------
RA (2000) DE Designation(s)
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10 44 22.91 -59 59 36.0 QZ Car = HD 93206
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6a.dat 69 2845 UBV photometry
table6b.dat 69 3100 BVR photometry
table6c.dat 47 104 BVRI photometry
table6d.dat 23 682 V ASAS3 cleaned photometry (station 93)
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Byte-by-byte Description of file: table6a.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (JD-2400000.0)
12- 16 F5.3 mag Vmag Johnson V magnitude
18- 23 F6.3 mag Bmag ?=99.999 Johnson B magnitude
25- 30 F6.3 mag Umag ?=99.999 Johnson U magnitude
32- 37 F6.3 mag B-V ?=99.999 Johnson B-V colour index
39- 44 F6.3 mag U-B ?=99.999 Johnson U-B colour index
47- 51 F5.3 --- X Air mass of the variable
53- 58 F6.3 --- dX Air-mass difference variable minus comparison
60- 65 I6 --- HDcomp HD number of the comparison star used
67- 69 I3 --- sta Numerical code of the observing station
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Byte-by-byte Description of file: table6b.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (JD-2400000.0)
12- 16 F5.3 mag Vmag Johnson V magnitude
18- 23 F6.3 mag Bmag Johnson B magnitude
25- 30 F6.3 mag Rmag Cousins R magnitude
32- 37 F6.3 mag B-V Johnson B-V colour index
39- 44 F6.3 mag V-R Cousins V-R colour index
46- 51 F6.3 --- X Air mass of the variable
53- 58 F6.3 --- dX Air-mass difference variable minus comparison
60- 65 I6 --- HDcomp HD number of the comparison star used
67- 69 I3 --- sta Numerical code of the observing station
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Byte-by-byte Description of file: table6c.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (JD-2400000.0)
12- 16 F5.3 mag Vmag Johnson V magnitude
18- 22 F5.3 mag B-V Johnson B-V colour index
24- 29 F6.3 mag V-R ?=99.999 Cousins V-R colour index
31- 36 F6.3 mag R-I ?=99.999 Cousins R-I colour index
38- 43 F6.3 mag V-I ?=99.999 Cousins V-I colour index
45- 47 I3 --- sta Numerical code of the observing station
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Byte-by-byte Description of file: table6d.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Heliocentric Julian date (JD-2400000.0)
13- 17 F5.3 mag Vmag Johnson V magnitude
19- 23 F5.3 mag e_Vmag Standard error on Vmag
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Acknowledgements:
Petr Harmanec, Petr.Harmanec(at)mff.cuni.cz,
Astronomical institute, Charles University, Czech Republic
References:
Broz et al., Paper II 2022A&A...666A..24B 2022A&A...666A..24B
(End) P. Harmanec [Astron. Inst., Czech Republic], P. Vannier [CDS] 04-Aug-2022