J/A+A/644/A104 Auriga bright stars BRITE phot. and RV (Strassmeier+, 2020)
BRITE photometry and STELLA spectroscopy of bright stars in Auriga:
Rotation, pulsation, orbits, and eclipses.
Strassmeier K.G., Granzer T., Weber M., Kuschnig R., Pigulski A.,
Popowicz A., Moffat A.F.J., Wade G.A., Zwintz K., Handler G.
<Astron. Astrophys. 644, A104 (2020)>
=2020A&A...644A.104S 2020A&A...644A.104S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, bright ; Magnitudes ; Radial velocities
Keywords: binaries: general - stars: rotation - stars: activity -
stars: fundamental parameters - stars: oscillations -
stars: late-type
Abstract:
We aim to determine periods for bright stars in the Auriga field that
are otherwise not easily accessible for ground-based photometry.
Continuous photometry with up to three BRITE satellites was obtained
for 12 targets and subjected to a period search. Contemporaneous
high-resolution optical spectroscopy with STELLA was used to obtain
radial velocities through cross correlation with template spectra as
well as to determine astrophysical parameters through a comparison
with model spectra.
Description:
Continuous photometry with BRITE satellites BRITE-Toronto (BTr),
BRITE-Heweliusz (BHr), and BRITE-Lem (BLb) of 12 very bright stars in
BRITE fields 20-AurPer-I-2016 (9 stars), 21-CetEri-I-2016 (2 stars)
and one star at the edge of fields 31-Tau-I-2017 and 48-OriTau-II-2019
are presented. Contemporaneous high-resolution optical spectroscopy
(R=55000) with STELLA-SES was used to obtain radial velocities and to
determine astrophysical parameters. BTr and BHr are red sensitive,
filter passband comparable to Sloan r, while BLb is blue sensitive
(Geneva B). The Aur-Per field was observed from JD 2457640 to 2457822
(9th Sept., 2016 to 9th March 2017) with BTr and BLb, from the latter
only the first 35 days and the last 27 days were successful. In this
field, the following stars were observed (names in parenthesis): HD
34029 (alpha Aur), HD 40183 (beta Aur), HD 31964 (epsilon Aur), HD
32069 (zeta Aur), HD 32630 (eta Aur), HD 40312 (theta Aur), HD 39003
(nu Aur, only BTr), HD 31398 (iota Aur), and HD 34452 (IQ Aur). The
latter was observed only between JD 2457647 and 2457672. The Cet-Eri
field was observed with BHr from JD 2457668 to 2457757 (6th Oct., 2016
to 3rd Jan., 2017) with BHr only. In this field, HD 20630 (kappa1 Cet)
and HD 22468 (V711 Tau) were observed. Finally, HD 40183 (beta Tau)
was observed in two fields, with BLb from JD 2458030 (3rd Oct., 2017)
to 2458170 (20th Feb. 2018) and BTr from 2458155 (5th Feb., 2018) to
2458179 (1st March, 2018) in field Tau, and again with Blb from JD
2458749 (22nd Sept., 2019) to 2458871 (22nd Jan., 2020) in field
Ori-Tau.
The BRITE data are obtained in different satellite configurations and
are provided by the BRITE consortium comprising HJD, absolute
magnitude plus ancillary data used for data decorrelation. For
analysis of the individual stars, data within an orbit, consisting of
up to 60 individual data points taken in immediate succession, were
3-sigma clipped and then zero-point adjusted, see paper for details.
Provided in the data files are HJD and magnitude averages plus an
error estimate which is the sample standard deviation divided by the
square-root of the number of observations within an orbit (RMS). The
STELLA-SES spectroscopic data were obtained contemporaneously to the
BRITE data for nine stars, namely HD 34029, HD 31964, HD 40183, HD
32630, HD 40312, HD 39003, HD 31398, HD 20630, and HD 22468, usually
on a daily basis. The first two stars have been observed in extended
campaigns. Consequentially, for HD 34029, all observed epochs from JD
2454305 (24th July 2007) to 2458996 (26th May 2020) are listed, while
HD 31964 data spans from 2457228 (25th July 2015) to 2458242 (3rd May
2018).
Barycentric radial velocities (RV) were determined from an
order-by-order cross correlation with a synthetic template spectrum.
60 echelle orders were used, the RV in the files is the weighted
average, the error is the RMS value.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 101 12 List of studied stars
phot/* . 21 Individual light curves
rv/* . 9 Individual radial velocity curves
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 11 I2 h RAh Simbad Right ascension (J2000)
13- 14 I2 min RAm Simbad Right ascension (J2000)
16- 20 F5.2 s RAs Simbad Right ascension (J2000)
22 A1 --- DE- Simbad Declination sign (J2000)
23- 24 I2 deg DEd Simbad Declination (J2000)
26- 27 I2 arcmin DEm Simbad Declination (J2000)
29- 32 F4.1 arcsec DEs Simbad Declination (J2000)
34- 50 A17 --- BLb Name of the table with BRITE-Lem (BLb)
light curve in subdirectory phot
52- 68 A17 --- BLb2 Name of the second table with BRITE-Lem (BLb)
light curve in subdirectory phot
70- 86 A17 --- BTr Name of the table with BRITE-Toronto (BTr)
light curve in subdirectory phot
88-101 A14 --- RV Name of the table with STELLA-SES radial
velocity curve in subdirectory rv
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Byte-by-byte Description of file: phot/*
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Bytes Format Units Label Explanations
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2- 12 F11.6 d HJD Heliocentric Julian date (HJD-2456000.0)
14- 21 F8.5 mag mag BRITE mean magnitude per orbit,
shifted to common zero-point
23- 29 F7.5 mag e_mag Error of mean from sample variance per orbit
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Byte-by-byte Description of file: rv/*
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Bytes Format Units Label Explanations
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1- 15 F15.7 d HJD Heliocentric Julian date
17- 24 F8.3 km/s BRV Barycentric radial velocity
26- 30 F5.3 km/s e_BRV Error estimate of RV
32 A1 --- Comp [ps] p = primary, s = secondary (1)
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Note (1): For HD22468, HD34029 and HD40183.
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Acknowledgements:
Thomas Granzer, tgranzer(at)aip.de
Klaus Strassmeier, kstrassmeier(at)aip.de
(End) Patricia Vannier [CDS] 20-Oct-2020