J/A+A/647/A160 Radial velocity data of epsilon Cyg (Heeren+, 2021)
Precise radial velocities of giant stars.
XV. Mysterious nearly periodic radial velocity variations in the eccentric
binary epsilon Cygni.
Heeren P., Reffert S., Trifonov T., Wong K.H., Lee M.H., Lillo-Box J.,
Quirrenbach A., Arentoft T., Albrecht S., Grundahl F., Andersen M.F.,
Antoci V., Palle P.L.
<Astron. Astrophys. 647, A160 (2021)>
=2021A&A...647A.160H 2021A&A...647A.160H
ADC_Keywords: Stars, giant ; Stars, K-type ; Binaries, spectroscopic ;
Exoplanets ; Radial velocities
Keywords: planetary systems - planets and satellites: detection -
planets and satellites: dynamical evolution and stability -
binaries: close - stars: horizontal branch - stars: oscillations
Abstract:
Using the Hamilton Echelle Spectrograph at Lick Observatory, we have
obtained precise radial velocities of a sample of 373 G- and K-giant
stars from 1999 until 2012, leading to the discovery of several single
and multiple planetary systems. The radial velocities of the
long-period (∼53 years) spectroscopic binary epsilon Cyg (HIP 102488)
are found to exhibit additional variations with a much shorter period
(∼291 days). This signature is not perfectly regular, as its period
and amplitude seem to change over time.
We intend to improve the orbital solution of the epsilon Cyg system,
and attempt to identify the cause of the nearly periodic shorter
period variations, which might be due to an additional substellar
companion.
We use precise radial velocity measurements of the K-giant star
epsilon Cyg from Lick Observatory, in combination with a large set of
RVs collected more recently with the SONG telescope, as well as
archival data sets.
Description:
Precise radial velocities of the giant star epsilon Cyg are presented.
A total of 109 measurements of this star were taken with the Hamilton
spectrograph at the Lick Observatory, from June 2000 until November
2011. Additionally, we present 228 radial velocities acquired with the
Hertzsprung SONG telescope on Tenerife, from April 2015 until December
2018. Part of these data are nightly averages from higher cadence
asteroseismic measurements. All observations were acquired and reduced
using the iodine cell approach.
Objects:
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RA (2000) DE Designation(s)
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20 46 12.68 +33 58 12.9 epsilon Cyg = HIP 102488
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lick_rv.dat 31 109 Radial velocity data of epsilon Cyg from
Lick Observatory (table A1)
song_rv.dat 31 228 Radial velocity data of epsilon Cyg from
the Hertzsprung SONG telescope on Tenerife
(table A1)
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See also:
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
J/A+A/574/A116 : G and K giant stars stellar parameters (Reffert+, 2015)
J/A+A/574/A116 : Stellar parameters of 372 giant stars (Stock+, 2018)
Byte-by-byte Description of file: lick_rv.dat song_rv.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d JD Julian date
17- 24 F8.2 m/s RV Radial velocity
28- 31 F4.2 m/s e_RV Error in radial velocity
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Acknowledgements:
Paul Heeren, pheeren(at)lsw.uni-heidelberg.de
References:
Hekker et al., Paper I 2006A&A...454..943H 2006A&A...454..943H
Reffert et al., Paper II 2006ApJ...652..661R 2006ApJ...652..661R
Hekker & Melendez, Paper III 2007A&A...475.1003H 2007A&A...475.1003H, Cat. J/A+A/475/1003
Hekker et al., Paper IV 2008A&A...480..215H 2008A&A...480..215H
Mitchell et al., Paper V 2013A&A...555A..87M 2013A&A...555A..87M
Trifonov et al., Paper VI 2014A&A...568A..64T 2014A&A...568A..64T
Reffert et al., Paper VII 2015A&A...574A.116R 2015A&A...574A.116R, Cat. J/A+A/574/A116
Trifonov et al., Paper VIII 2015A&A...582A..54T 2015A&A...582A..54T
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Fredslund Andersen et al., 2019PASP..131d5003F 2019PASP..131d5003F
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(End) Patricia Vannier [CDS] 28-Jan-2021