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J/A+A/520/A89       Multi-epoch photometry of δ Ori      (Mayer+, 2010)

Physical elements of the eclipsing binary δ Orionis. Mayer P., Harmanec P., Wolf M., Bozic H., Slechta M. <Astron. Astrophys. 520, A89 (2010)> =2010A&A...520A..89M
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI Keywords: binaries: eclipsing - stars: early type - stars: fundamental parameters - stars: individual: delta Ori Abstract: For years, δ Ori was considered a normal binary with an O9.5 II primary exhibiting apsidal-line advance. However, in 2002 radial-velocity curves of both binary components derived from the IUE and optical spectra using the cross-correlation technique have been published by Harvin et al. (2002ApJ...565.1216H); surprisingly low masses of 11.2 and 5.6M were obtained. We obtained new spectra in the red spectral region and new UBV photometry. Using all published photometry and radial velocities, we deduced more accurate orbital and apsidal line periods. The main result of this paper is to show that the observed line spectra of δ Ori are composed of the lines of the O9.5 II primary and a similarly hot tertiary, while the lines of a cooler B-type secondary are too faint to be detected in the available spectra. The character of the light curve (low-amplitude partial eclipses and a non-negligible scatter of the data) does not allow for a unique light-curve solution. Nevertheless, we show that the assumption of normal primary-component mass and radius corresponding to the O9.5 II classification (25M, 16-17R) leads to consistent parameters for the system. Description: "Table1" contains all known radial velocities measured for δ Ori "Table2" contains all known photometry of δ Ori. Objects: --------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------- 05 32 00.40 -00 17 56.7 delta Ori = HD 36486 --------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1a.dat 32 824 RV measurements, third component not considered table1g.dat 32 82 RV measurements by Gaussians with third component tablea1.dat 113 16 Journal of available RV observations table2a.dat 29 459 Photometry by Stebbins (1915ApJ....42..133S), Storer (1930PASP...42..291S), Worley (1955PASP...67..330W) and Koch & Hrivnak (1981ApJ...248..249K), table24.dat 70 5 Photometry of Johnson et al. (1966, CoLPL, 4, 99) green and blue table27.dat 38 89 HIPPARCOS photometry, Perryman et al. (1997, I/239) table28.dat 61 149 This paper, δ Ori UBV photometry made at Hvar table2e.dat 61 21 This paper, ε Ori UBV photometry made at Hvar
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table1a.dat table1g.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian date 15- 21 F7.2 km/s RV Radial velocity 23- 27 F5.3 --- Weight Weight of the data point 29- 30 I2 --- Source [1/16] Source, in tablea1.dat file 32 I1 --- code [1] "1" means primary component
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Source [1/16] Source number 4- 10 A7 d HJD1 Time interval, HJD-2400000 11 A1 --- --- [-] 12- 18 A7 d HJD2 Time interval, HJD-2400000 20- 22 I3 --- NRV Number of RV measurements 24- 69 A46 --- Tel Telescope and instrument 71-113 A43 --- Ref Reference
Byte-by-byte Description of file: table2a.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian date 14- 18 F5.3 mag mag Magnitude 20- 24 F5.3 --- Weight Weight of the data point 26- 27 I2 --- Source [1/10] Source (1) 29 I1 --- Band [3/4] 3: V or green magnitude, 4: blue magnitude
Note (1): Source as follows: 1 = Stebbins (1915ApJ....42..133S) 2 = Storer (1930PASP...42..291S) 3 = Worley (1955PASP...67..330W) 9 = Koch & Hrivnak (1981ApJ...248..249K), green 10 = Koch & Hrivnak (1981ApJ...248..249K), blue
Byte-by-byte Description of file: table24.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian date 14- 18 F5.3 mag Vmag V magnitude 20- 25 F6.3 mag B-V B-V colour index 27- 32 F6.3 mag U-B U-B colour index 34- 39 F6.3 mag V-R V-R colour index 41- 46 F6.3 mag R-I R-I colour index 48- 52 I5 --- Weights Weights for UBVRI bands 54- 57 F4.2 --- X Air mass 59- 70 F12.4 d GJD Geocentric Julian date
Byte-by-byte Description of file: table27.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian date 14- 19 F6.4 mag Hp HIP magnitude 21- 25 F5.3 mag V(Hp) V magnitude transformed from HIP 27- 30 F4.2 --- Weight Weight of the data point 32- 36 F5.3 mag e_Hp rms uncertainty on Hp 38 I1 --- Flag [0/1] Flag
Byte-by-byte Description of file: table28.dat table2e.dat
Bytes Format Units Label Explanations
1- 12 F12.4 d HJD Heliocentric Julian date 14- 18 F5.3 mag Vmag V magnitude 20- 24 F5.3 mag Bmag B magnitude 26- 30 F5.3 mag Umag U magnitude 32- 37 F6.3 mag B-V B-V colour index 39- 44 F6.3 mag U-B U-B colour index 46- 48 F3.1 --- Weight Weight of the data point 50- 54 F5.3 --- X Air mass 56- 61 F6.3 --- dX Difference of air mass "var minus comp"
Acknowledgements: Pavel Mayer, mayer(at)cesnet.cz
(End) Patricia Vannier [CDS] 19-Jul-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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