J/A+A/580/A31 Aldebaran radial velocity variations (Hatzes+, 2015)
Long-lived, long-period radial velocity variations in Aldebaran:
A planetary companion and stellar activity.
Hatzes A.P., Cochran W.D., Endl M., Guenther E.W., MacQueen P.,
Hartmann M., Zechmeister M., Han I., Lee B.-C., Walker G.A.H., Yang S.,
Larson A.M., Kim K.-M., Mkrtichian D.E., Dollinger M., Simon A.E.,
Girardi L.
<Astron. Astrophys. 580, A31 (2015)>
=2015A&A...580A..31H 2015A&A...580A..31H
ADC_Keywords: Stars, variable ; Radial velocities
Keywords: star: individual: alpha Tau - techniques: radial velocities -
Abstract:
We investigate the nature of the long-period radial velocity
variations in α Tau first reported over 20 years ago.
We analyzed precise stellar radial velocity measurements for α Tau
spanning over 30 years. An examination of the Hα and CaII
λ8662 spectral lines, and Hipparcos photometry was also done to
help discern the nature of the long-period radial velocity variations.
Description:
Seven independent data sets of high precision radial velocity data
were used for our analysis. Precise RV measurements were also made
with a Hydrogen-Fluoride (H-F) cell as part of the CFHT survey
(hereafter the "CFHT" data set) of Walker et al.
(1989ApJ...343L..21W 1989ApJ...343L..21W) as well as additional measurements from the
Dominion Astrophysical Observatory (hereafter "DAO" data set)
using the same technique. See Campbell & Walker (1979PASP...91..540C 1979PASP...91..540C)
and Larson et al. (1993PASP..105..825L 1993PASP..105..825L) for a description of the H-F
measurements. For the remaining five RV data sets an iodine (I2)
cell provided the wave- length reference. These include the original
measurements using the McDonald Observatory 2.1m telescope (here-after
"McD-2.1m" data set) and the coude spectrograph in the so-called
"cs11" focus (hereafter "McD-CS11" data set) of the 2.7m
telescope at McDonald Observatory. We should note that the we did not
include the McDonald data that were used for the bisector measurements
of Hatzes & Cochran (1998MNRAS.293..469H 1998MNRAS.293..469H). These were taken using
telluric lines as a wavelength reference which had a lower precision
than the iodine wavelength calibration or H-F methods. The latest
McDonald measurements were taken using the Tull Spectrograph at the
so-called "cs23" focus (here-after the "McD-Tull" data set) as
part of a long-term planet search program (e.g. Cochran et al.,
1997ApJ...483..457C 1997ApJ...483..457C; Endl et al., 2004ApJ...611.1121E 2004ApJ...611.1121E; Robertson et
al., 2012ApJ...749...39R 2012ApJ...749...39R).
Objects:
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RA (2000) DE Designation(s)
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04 35 55.24 +16 30 33.5 alpha Tau = Name Aldebaran
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 27 29 CFHT RV measurements for α Tau
table4.dat 26 36 DAO RV measurements for α Tau
table5.dat 26 50 McDonald 2.1m telescope measurements (McD-2.1m)
for α Tau
table6.dat 26 9 McDonald 2.7m telescope measurements (McDCS11)
for α Tau
table7.dat 26 104 McDonald 2.7m telescope + Tull Spectrograph
measurements (McD-Tull) for α Tau
table8.dat 26 103 TLS (Tautenburg) measurements for α Tau
table9.dat 26 42 BOAO (Bohyunsan) RV measurements for α Tau
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Byte-by-byte Description of file: table[3456789].dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d JD Julian date
14- 21 F8.2 m/s RV Radial velocity
23- 27 F5.2 m/s e_RV rms uncertainty on RV
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Acknowledgements:
Artie P. Hatzes, artie(at)tls-tautenburg.de
(End) Patricia Vannier [CDS] 15-Jul-2015