J/MNRAS/443/2815 Cerro Armazones spectroscopy of F dwarfs (Pribulla+, 2014)
Cerro Armazones spectroscopic survey of F dwarfs.
Pribulla T., Sebastian D., Ammler-von Eiff M., Stahl O., Berndt A.,
Chini R., Hoffmeister V., Mugrauer M., Neuhauser R., Vanko M.
<Mon. Not. R. Astron. Soc., 443, 2815-2823 (2014)>
=2014MNRAS.443.2815P 2014MNRAS.443.2815P
ADC_Keywords: Stars, dwarfs ; Stars, F-type ; MK spectral classification ;
Radial velocities ; Rotational velocities
Keywords: techniques: radial velocities - binaries: spectroscopic -
stars: rotation
Abstract:
We present a spectroscopic survey of a sample of F stars that have not
yet been searched for planets. The observations of 187 stars obtained
with the Bochum Echelle Spectrographic Observer of the Cerro Armazones
Observatory were aimed at nearby (closer than 70pc) main-sequence
stars without sufficient archive ([fiber-fed extended range optical
spectrograph (FEROS)/high accuracy radial velocity planet search
(HARPS)]) spectroscopy. The primary goal of the survey was to select
the best candidates for radial-velocity searches of extrasolar
planets. The spectra were analysed using the broadening-function
technique, the method of choice for rapid rotators later than about
A5. The analysis was focused not only at the determination of
projected rotational velocity (defining precision of radial-velocity
determination), but also at the detection of previously unknown
spectroscopic binaries/multiples or stars showing strong line
asymmetries. 12 previously unknown spectroscopic binaries/triples were
detected. For all observed targets the spectral type was determined.
About 140 stars are rotating faster than the resolution limit of
10km/s sampling the onset of convection and slow rotation at mid-F
spectral types in great detail. Radial-velocity precision of the data
(about 100m/s) is insufficient to detect planets but could indicate
most SB1 systems with stellar companions. As there are already 2-3
observations per object for these newly detected binary stars, only a
few additional follow-up observations will be needed to obtain
constraints on orbital parameters. We identified a sample of 68 bright
F-type dwarf stars which are perfect targets for future planet
searches. They rotate moderately or slowly and do not show any sign of
binarity, pulsations, or surface activity.
Description:
Optical spectroscopy at the OCA was secured using the BESO
spectrograph fibre-fed from the focus of the 1.5m Hexapod telescope
(see Fuhrmann et al. 2011). 409 spectra of 187 dwarfs were obtained
between 2009 April 10 and 2010 March 29. Exposure times ranged between
300 and 1800s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 71 187 RV variations and suitability of the targets for
the exoplanet detection (non single-lined stars
added at CDS)
table1.dat 94 409 Journal of the spectroscopic observations and
results of the spectroscopic analysis for
individual spectra
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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 A1 --- n_HIP [*a] * for most interesting stars, and
'a' for CDS addition (2)
3- 8 I6 --- HIP HIP number
10- 15 I6 --- HD HD number
17- 20 F4.2 mag Vmag [4.3/9.1] V magnitude
22 I1 --- Np [1/7]? Number of pointings
24- 28 F5.1 km/s vsini [5/250]? Average projected rotational velocity
30- 34 F5.2 km/s DRV [0/38]? Range of observed radial velocity
36- 40 F5.1 km/s dvsini [0/133]? Range of rotational velocity
42- 45 I4 m/s sRV [11/1076]? Expected RV precision of the target
47- 49 I3 d DT [0/175]? Time range of observation
51- 59 A9 --- SpT Mean spectral type as determined in this
paper (1)
61- 71 A11 --- SpT-M Michigan spectral type (G1)
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Note (1): The special abbreviations of the extended MK spectral classification
were neglected here.
Note (2): the flag means:
* = most suitable objects for RV exoplanet search.
a = addition made at CDS for the 12 stars observed in table1 and marked
as "2 comp" (2 components). For these stars, the V magnitudes were
taken from Simbad, and the spectral types from table1.
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
8- 13 I6 --- HD HD number
15- 18 F4.2 mag Vmag [4.3/9.1] V magnitude
20- 30 F11.5 d HJD [55079/55286] Observation date (HJD-2400000)
32- 35 I4 s ExpTime [300/1800] Exposure time
37- 43 F7.2 km/s RV [-107/68]?=- Barycentric Radial velocity (1)
45- 48 F4.2 km/s e_RV [0.02/0.8]?=- rms uncertainty on RV
50- 54 F5.1 km/s vsini [5/249]?=- Projected rotational velocity
56- 58 F3.1 km/s e_vsini [0.1/3.3]?=- rms uncertainty on vsini
60- 66 A7 --- Note Note regarding the BF shape (2)
68- 73 I6 --- Temp HD number of the best-fitting template spectrum
75- 82 A8 --- SpT MK spectral type of template
84- 94 A11 --- SpT-M Michigan spectral type (G1)
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Note (1): Radial velocities are listed only for objects with single component
visible in the spectra.
Note (2): Note about the Broadening Function shape:
2 comp = 2 components
2 comp: = one of the components is visible just marginally
SB1 = single-lined spectroscopic binary
AS = asymmetric profile
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Global notes:
Note (G1): Spectral type from the Michigan Catalogue of HD stars (Houk & Cowley
1975, Cat. III/31; Houk 1978, Cat. III/51; Houk 1982, Cat. III/80;
Houk & Smith-Moore 1998, Cat. III/133 and Houk & Swift 1999, Cat. III/214).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Apr-2015