J/AN/341/989 theta Cep radial velocity curve (Bischoff+, 2020)
Spectroscopic orbit determination of the long-periodic binary system theta Cep.
Bischoff R., Mugrauer M., Lux O., Zehe T., Heyne T., Wagner D., Geymeier M.
<Astron. Nachrichten 341, 989-995 (2020)>
=2020AN....341..989B 2020AN....341..989B (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Radial velocities
Keywords: binaries: spectroscopic - stars: individual: theta Cep
Abstract:
In 2015 a radial velocity monitoring campaign was started in order to
redetermine and/or constrain the orbital solutions of spectroscopic
binary systems. The observations were carried out at the University
Observatory Jena with the echelle spectrograph FLECHAS. The results
from the main part of our target sample are already published. For the
final target of this campaign, theta Cep, we can now present an
orbital solution based on a homogeneously covered radial velocity
curve. The period of this single-lined spectroscopic binary turns out
to be significantly larger and the orbit is much more eccentric
compared to the given values in the 9th Catalogue of Spectroscopic
Binary Orbits (Pourbaix et al., Cat. B/sb9).
Description:
Here, we present 197 RV measurements of the spectroscopic binary theta
Cep, taken between 2016 and 2020 at the University Observatory Jena
with the echelle spectrograph FLECHAS. The typical RV precision is
0.38km/s.
Objects:
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RA (2000) DE Designation(s)
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20 29 34.87 +62 59 38.6 theta Cep = HR 7850
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 65 1 Orbital elements of theta Cep
tablea1.dat 20 197 theta Cep RV measurements
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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- 5 F5.1 d P Period
7- 9 F3.1 d e_P Error of period
11- 19 F9.1 d T0 Periastron time (BJD)
21- 23 F3.1 d e_T0 Error of periastron time (BJD)
25- 28 F4.2 km/s K RV semi-amplitude
30- 33 F4.2 km/s e_K Error of RV semi-amplitude
35- 39 F5.2 km/s gamma Systemic velocity
41- 44 F4.2 km/s e_gamma Error of systemic velocity
46- 50 F5.3 --- e Eccentricity
52- 56 F5.3 --- e_e Error of eccentricity
58- 61 F4.1 deg omega Argument of periastron
63- 65 F3.1 deg e_omega Error of argument of periastron
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date of observation
15- 20 F6.2 km/s RV Radial velocity (1)
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Note (1): The typical RV uncertainty is 0.38km/s.
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Acknowledgements:
Based on observations obtained with telescopes of the University
Observatory Jena, which is operated by the Astrophysical Institute of
the Friedrich-Schiller-University.
From Richard Bischoff, richard.bischoff(at)uni-jena.de
(End) Richard Bischoff [AIU Jena, Germany], Patricia Vannier [CDS] 25-Jan-2021