J/ApJ/702/403 Photometric observations of V1197 Orionis (Wilson+, 2009)
Ellipsoidal variable V1197 Orionis: absolute light-velocity analysis for known
distance.
Wilson R.E., Chochol D., Komzik R., Van Hamme W., Pribulla T., Volkov I.
<Astrophys. J., 702, 403-413 (2009)>
=2009ApJ...702..403W 2009ApJ...702..403W
ADC_Keywords: Photometry, UBVRI ; Stars, variable ; Binaries, spectroscopic ;
Stars, K-type
Keywords: binaries: close - methods: data analysis - stars: distances -
stars: fundamental parameters - stars: individual (V1197 Orionis) -
stars: oscillations
Abstract:
V1197 Orionis light curves from a long-term observing program for red
giant binaries show ellipsoidal variation of small amplitude in the V
and RC bands, although not clearly in U and B. Eclipses are not
detected. All four bands show large irregular intrinsic variations,
including fleeting quasi-periodicities identified by power spectra,
that degrade analysis and may be caused by dynamical tides generated
by orbital eccentricity. To deal with the absence of eclipses and
consequent lack of astrophysical and geometrical information, direct
use is made of the Hipparcos parallax distance while the V and RC
light curves and (older) radial velocity curves are analyzed
simultaneously in terms of absolute flux. The red giant's temperature
is estimated from new spectra. The dim companion has not been observed
or discussed in the literature but most solutions find its mass to be
well below that of the red giant. Solutions show red giant masses that
are too low for evolution to the red giant stage within the age of the
Galaxy, although that result is probably an artifact of the intrinsic
brightness fluctuations.
Description:
Photometry began in 1999 at the Skalnate Pleso Observatory and has
produced about 740 observations of V1197 Ori to date in each of the
four bands U, B, V and Cousins Rc. A total of 8140 observations
spread over four nights in 2007 November-December were obtained at
Stara Lesna observatory in differential Rc band (table 1). These
were CCD observations taken with the SBIG ST10-XME camera relative to
the comparison star numbered TYC 4767-646-1, for which we estimate
Rc=11.590±0.029mag. Differential U, B, V, Rc magnitudes in the
sense V1197 Ori minus HD 38406 are in Table 3.
Objects:
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RA (2000) DE Designation(s)
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05 43 09.3 -01 36 48 V1197 Ori = TYC 4767-643-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 20 8140 V1197 Ori Stara Lesna differential Rc CCD
photometry of 2007
table3.dat 107 742 V1197 Ori photometric observations
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See also:
J/AcA/54/347 : IVB mag of LMC ellipsoidal variables (Soszinski+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 --- HJD Heliocentric Julian Date
15- 20 F6.3 mag dRmag Differential Rc band magnitude (1)
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Note (1): In the sense Variable - Comparison (TYC 4767-00646-1).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 --- HJD-U Heliocentric Julian Date of U band observation
15- 20 F6.3 mag dUmag Differential U band magnitude (1)
22- 26 F5.3 --- w_dUmag Weight of dUmag observation (1)
28- 40 F13.5 --- HJD-B ?=0 HJD of B band observation (1)
42- 47 F6.3 mag dBmag ?=0 Differential B band magnitude (1)
49- 53 F5.3 --- w_dBmag ?=0 Weight of dBmag observation (1)
55- 67 F13.5 --- HJD-V ?=0 HJD of V band observation (1)
69- 74 F6.3 mag dVmag ?=0 Differential V band magnitude (1)
76- 80 F5.3 --- w_dVmag ?=0 Weight of dVmag observation (1)
82- 94 F13.5 --- HJD-R ?=0 HJD of R band observation (1)
96-101 F6.3 mag dRmag ?=0 Differential Rc band magnitude (1)
103-107 F5.3 --- w_dRmag ?=0 Weight of dRmag observation (1)
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Note (1): In the sense Variable - Comparison (HD 38406).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 28-Sep-2011