J/MNRAS/466/1290 Metal-rich SX Phe stars in Kepler field (Nemec+, 2017)
Metal-rich SX Phe stars in the Kepler field.
Nemec J.M., Balona L.A., Murphy S.J., Kinemuchi K., Jeon Y.-B.
<Mon. Not. R. Astron. Soc., 466, 1290-1329 (2017)>
=2017MNRAS.466.1290N 2017MNRAS.466.1290N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Radial velocities ; Rotational velocities ;
Photometry ; MK spectral classification
Keywords: stars: abundances - blue stragglers - stars: kinematics and dynamics -
stars: oscillations - stars: Population II -
stars: variables: δ Scuti
Abstract:
A spectroscopic and photometric analysis has been carried out for 32
candidate SX Phe variable blue straggler stars in the Kepler field.
Radial velocities (RVs), space motions (U, V, W), projected rotation
velocities (vsini), spectral types and atmospheric characteristics
(Teff, logg, [Fe/H], ξt, ζRT, etc.) are presented for
30 of the 32 stars. Although several stars are metal-weak with extreme
halo orbits, the mean [Fe/H] of the sample is near-solar, thus the
stars are more metal-rich than expected for a typical sample of Pop.
II stars and more like halo metal-rich A-type stars. Two-thirds of the
stars are fast rotators with vsini>50km/s^, including four
stars with vsini>200km/s. Three of the stars have (negative)
RVs>250km/s^, five have retrograde space motions and 21 have
total speeds (relative to the Local Standard of Rest) >400km/s.
All but one of the 30 stars have positions in a Toomre diagram
consistent with the kinematics of bona fide halo stars (the exception
being a thick-disc star). Observed Romer time delays, pulsation
frequency modulations and light curves suggest that at least one-third
of the stars are in binary (or triple) systems with orbital periods
ranging from 2.3d to more than four years.
Description:
High-resolution echelle spectra for 32 of the BN12 candidate SX Phe
stars were acquired in 2013 and 2014 with the ESPaDOnS spectrograph
mounted on the Canada-France-Hawaii 3.6-m telescope (CFHT). Two
stars fainter than 15th magnitude, KIC 5390069 and KIC 7300184, were
too faint to be observed. A total of 178 SX Phe star spectra were
taken by the CFHT Queue Service Observing team, with the number of
spectra taken per star ranging from 3 to 11, over three to seven
independent epochs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 208 Summary of CFHT and APO spectra
table2.dat 94 34 Locations and kinematics for the 34 SX Phe
candidates
table3.dat 90 32 Spectral types, luminosity classes, mean
projected rotational velocities, and mean
radial-tangential macroturbulent velocities
table4.dat 89 40 Atmospheric characteristics for 32 of the 34
candidate SX Phe stars in the Kepler field
table5.dat 99 48 Mean magnitudes and colours for the Kepler-field
SX Phe candidates
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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 A1 --- Note Note (1)
3- 14 A12 --- Name KIC/HD name
16- 32 A17 --- Sp Spectrum number (CFHT or APO)
34- 43 A10 "YYYY/MM/DD" Obs.date UTC mid-exposure date (mid)
44 A1 --- --- [,]
46- 53 A8 "h:m:s" Obs.time UTC mid-exposure time (mid)
55- 66 F12.4 d BJD Mid-exposure barycentric Julian Day
68- 71 I4 s ExpTime Exposure time
73- 75 I3 --- S/N Signal-to-noise ratio
77- 80 F4.2 --- AM Airmass at the mid-time of the observation
82- 88 F7.2 km/s BRV Barycentric radial velocity (2)
90- 94 F5.2 km/s e_BRV rms uncertainty on BRV
95 A1 --- l_vsini Limit flag on vsini
96-101 F6.2 km/s vsini ? Projected equatorial velocity (2)
103-107 F5.2 km/s e_vsini ? rms uncertainty on vsini
108-111 A4 --- Flag Note
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Note (1): Note as follows:
a = Kepler-field SX Phe stars
b = IAU radial velocity standard stars
Note (2): For the SB2 system KIC 6780873, the RV and vsini entries are for the
primary component.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC KIC star number
10- 11 I2 --- CFHT ?=- CFHT star number
12 A1 --- n_CFHT Uncertainty flag on CFHT
14- 20 F7.4 deg GLON Galactic longitude
22- 28 F7.4 deg GLAT Galactic latitude
30- 34 F5.3 mag E(B-V)KIC ?=- KIC reddening
36- 39 F4.2 mag E(B-V) New reddening
41- 44 I4 pc dKIC ?=- KIC distance
46- 49 I4 pc d New distance
51- 53 I3 pc zKIC ?=- KIC height above the Galactic plane
55- 57 I3 pc z New height above the Galactic plane
59- 64 F6.1 km/s ? Mean radial velocity
66- 68 F3.1 km/s e_ ? rms uncertainty on
70- 71 I2 --- o_ ? Number of measured spectra
72 A1 --- n_ [*] * for binary systems,
systemic radial velocity in
74- 78 I5 km/s Uvel ? Space motion, U, relative to the LSR
80- 83 I4 km/s Vvel ? Space motion, V, relative to the LSR
85- 89 I5 km/s Wvel ? Space motion, W, relative to the LSR
91- 94 I4 km/s Tvel ? Total space motion, relative to the LSR
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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- 8 I8 --- KIC KIC star number
10- 11 I2 --- CFHT ?=- CFHT star number
12 A1 --- n_CFHT Uncertainty flag on CFHT
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 24 F5.2 s RAs Right ascension (J2000)
26 A1 --- DE- Declination sign (J2000)
27- 28 I2 deg DEd Declination (J2000)
30- 31 I2 arcmin DEm Declination (J2000)
33- 37 F5.2 arcsec DEs Declination (J2000)
39- 42 A4 --- SpTypeK Spectral type based on the K-line
44- 47 A4 --- SpTypeH Spectral type based on hydrogen lines
49- 52 A4 --- SpTypeM Spectral type based on metal lines
54- 60 A7 --- Lum Luminosity class
61 A1 --- l_FT Limit flag on FT
62- 66 F5.1 km/s FT Weighted average of the vsini values
given in Table 1
68- 70 F3.1 km/s e_FT rms uncertainty on FT
72- 73 I2 --- o_FT Number of spectra measured
76 A1 --- l_GOF Limit flag on GOF
77- 78 I2 km/s GOF ? Mean vsini values derived using the
goodness-of-fit method
80 I1 km/s e_GOF ? rms uncertainty on GOF
82- 83 I2 km/s <zetaRT> ? Average radial-tangential macroturbulent
velocity, ζRT. derived using the
goodness-of-fit method
85 I1 km/s e_<zetaRT> ? rms uncertainty on <zetaRT>
87 A1 --- --- [(]
88- 89 I2 --- o_<zetaRT> ? number of lines that were measured
90 A1 --- --- [)]
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC KIC star number
10- 11 I2 --- CFHT ?=- CFHT star number
12 A1 --- n_CFHT Uncertainty flag on CFHT
14- 17 F4.2 [cm/s2] loggKIC ? KIC surface gravity (SME estimate)
20- 23 F4.2 [cm/s2] loggH14 H14 surface gravity (VWA/MOOG estimates
based on the EW/COG method) (1)
25- 28 F4.2 [cm/s2] logg This paper surface gravity
30- 33 F4.2 [cm/s2] e_logg ? rms uncertainty on logg
34 A1 --- n_logg [)] Flag for assumed or uncertainty value
of logg
36- 39 I4 K TeffKIC ?=- KIC Effective temperature (SME estimate)
42- 45 I4 K TeffH14 ?=- H14 Effective temperature (VWA/MOOG
estimates based on the EW/COG method) (1)
47- 50 I4 K Teff This paper Effective temperature
52- 54 I3 K e_Teff rms uncertainty on Teff
56- 59 F4.1 km/s xit This paper microturbulent velocity
61- 63 F3.1 km/s e_xit rms uncertainty on xit
64 A1 --- n_xit [)] Flag for assumed or uncertainty value
of xit
66- 70 F5.2 [-] [Fe/H]KIC ?=- KIC metal abundance (SME estimate)
73- 77 F5.2 [-] [Fe/H]H14 ?=- H14 metal abundance (VWA/MOOG estimates
based on the EW/COG method) (1)
79- 83 F5.2 [-] [Fe/H] This paper metal abundance
85- 88 F4.2 [-] e_[Fe/H] ? rms uncertainty on [Fe/H]
89 A1 -- n_[Fe/H] [)] Uncertainty flag on [Fe/H]
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Note (1): H14: Huber et al., 2014, Cat. J/ApJS/211/2.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC KIC star number
10- 11 I2 --- CFHT ?=- CFHT star number
12 A1 --- n_CFHT Uncertainty flag on CFHT
14- 19 F6.3 mag Kpmag ?=- Kepler magnitude
20 A1 --- n_Vmag [n] n if new observation (1)
21- 26 F6.3 mag Vmag ?=- E12 V magnitude (2)
27 A1 --- n_B-V [n] n if new observation (1)
28- 32 F5.3 mag B-V ?=- E12 B-V colour index (2)
33 A1 --- n_U-B [n] n if new observation (1)
34- 39 F6.3 mag U-B ?=- E12 U-B colour index (2)
40 A1 --- n_(B-V)0K [n] n if new observation (1)
41- 45 F5.2 mag (B-V)0K ?=- KIC dereddened B-V colour index
47 A1 --- n_(B-V)0n [n] n if new observation (1)
48- 51 F4.2 mag (B-V)0n ?=- New dereddened B-V colour index
52 A1 --- n_(U-B)0K [n] n if new observation (1)
53- 57 F5.2 mag (U-B)0K ?=- KIC dereddened U-B colour index
59 A1 --- n_(U-B)0n [n] n if new observation (1)
60- 64 F5.2 mag (U-B)0n ?=- New dereddened U-B colour index
66- 71 F6.3 mag g-rKIC ?=- KIC g-r colour index
74- 78 F5.3 mag g-rKIS ?=- Kepler-INT Survey g-r colour index
80- 85 F6.3 mag r-i ? KIC r-i colour index
87- 92 F6.3 mag H-K ? KIC H-K colour index
94- 99 F6.3 mag J-K ? KIC J-K colour index
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Note (1): values from new photometric observations.
Note (2): E12: Everett et al. (2012PASP..124..316E 2012PASP..124..316E).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Sep-2019