J/A+A/531/A49 UBV and spectroscopic variations of V2368 Oph (Harmanec+, 2011)
V2368 Ophiuchi: An eclipsing and double-lined spectroscopic binary used as a
photometric comparison star for U Oph.
Harmanec P., Bozic H., Mayer P., Eenens P., Broz M., Wolf M., Yang S.,
Slechta M., Ruzdjak D., Sudar D., Ak H.
<Astron. Astrophys. 531, A49 (2011)>
=2011A&A...531A..49H 2011A&A...531A..49H
ADC_Keywords: Binaries, spectroscopic ; Photometry, UBV ; Radial velocities ;
Spectroscopy
Keywords: stars: early-type - stars: binaries - stars: individual: V2368 Oph -
stars: individual: U Oph - binaries: spectroscopic
Abstract:
The A-type star HR 6412 = V2368 Oph was used by several investigators
as a photometric comparison star for the known eclipsing binary U Oph
but was found to be variable by three independent groups, including
us. By analysing series of new spectral and photometric observations
and a critical compilation of available radial velocities, we were
able to find the correct period of light and radial-velocity
variations and demonstrate that the object is an eclipsing and
double-lined spectroscopic binary moving in a highly eccentric orbit.
We derived a linear ephemeris
Tmin.I=HJD(2454294.67±0.01)+(38.32712±0.00004)d*E and estimated
preliminary basic physical properties of the binary.
Description:
After realising that V2368 Oph is a variable star, we started
systematic UBV observations of it at Hvar and SPM observatories. A
limited set of UBV observations was also obtained by HA at the Turkish
National Observatory.
Simultaneously with photometric observations, we also begun to collect
electronic spectra in Ondrejov, San Pedro Martir, and Dominion
Astrophysical Observatory.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
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17 16 14.25 +02 11 10.5 V2368 Oph = HR 6412
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2a.dat 37 158 All-sky Johnson V photometry of V2368 Oph
table2b.dat 37 585 Standard UBV photometry of V2368 Oph
from three stations
table3a.dat 21 153 Hα radial velocities of the primary
of V2368 Oph measured with the SPEFO program
(Horn et al. 1996A&A...309..521H 1996A&A...309..521H)
table3b.dat 40 135 SiII, Hα, and MgII radial velocities of both
components of V2368 Oph measured via Gaussian
fits to the line profiles
rjd.dat 48 217 List of Hα, SiII and MgII spectra
spectra/* . 188 Individual spectra
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Byte-by-byte Description of file: table2?.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian date
14- 18 F5.3 mag Vmag Johnson V magnitude
20- 24 F5.3 mag Bmag ? Johnson B magnitude
26- 30 F5.3 mag Umag ? Johnson U magnitude
32- 34 F3.1 --- w Weight of the data point
36- 37 I2 --- Obs Code of the observatory (1)
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Note (1): Code of the observatory as follows:
1 = Hvar observatory
30 = San Pedro Martir 0.84-m
61 = Hipparcos satellite Hp photometry transformed to Johnson V
66 = Tubitak National Observatory
93 = ASAS3 automatic telescope
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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- 12 F12.4 d HJD Heliocentric Julian date
15- 20 F6.2 km/s RV1 Radial velocity of the primary
22- 27 F6.1 km/s RV2 ? Radial velocity of the secondary (2)
30- 34 F5.3 --- w ? Weight of the data point (2)
37- 40 A4 --- Line [MgII Ha SiII] Line (G1) (2)
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Note (2): Only in table3b.dat
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Byte-by-byte Description of file: rjd.dat
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Bytes Format Units Label Explanations
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1- 4 I4 0.1nm lam.min Lower limit of wavelength range
6- 9 I4 0.1nm lam.max Upper limit of wavelength range
11- 14 A4 --- Line [MgII Ha SiII] Line (G1)
16- 27 A12 --- FileName Filename of individual spectra
29- 40 F12.4 d HJD Heliocentric Julian date
44- 48 F5.3 --- w weights of individual spectra from S/N
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Byte-by-byte Description of file(#): spectra/*
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Bytes Format Units Label Explanations
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1- 10 F10.4 0.1nm lambda Wavelength
13- 18 F6.4 --- RFlux Relative rectified flux
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Global notes:
Note (G1): Lines as follows:
MgII = Mg II λ4481 line
SiII = Si II doublet lines λ6347 and 6371Å
Ha = Hα line
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Acknowledgements:
Petr Harmanec, hec(at)sirrah.troja.mff.cuni.cz
History:
* 06-Jun-2011: Original version
* 07-Aug-2011: added the limits in the wavelength in the list of spectra
(file "rjd.dat")
(End) Patricia Vannier [CDS] 06-Jun-2011