J/MNRAS/475/478 delta Scuti pulsating stars LAMOST views (Qian+, 2018)
LAMOST views δ Scuti pulsating stars.
Qian S.-B., Li L.-J., He J.-J., Zhang J., Zhu L.-Y., Han Z.-T.
<Mon. Not. R. Astron. Soc., 475, 478-491 (2018)>
=2018MNRAS.475..478Q 2018MNRAS.475..478Q (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Radial velocities
Keywords: binaries: general - stars: fundamental parameters -
stars: oscillations - stars: variables: Scuti
Abstract:
About 766 δ Scuti stars were observed by LAMOST by 2017 June 16.
Stellar atmospheric parameters of 525 variables were determined, while
spectral types were obtained for all samples. In the paper, those
spectroscopic data are catalogued. We detect a group of 131 unusual
and cool variable stars (UCVs) that are distinguished from the normal
δ Scuti stars (NDSTs). On the H-R diagram and the logg-T
diagram, the UCVs are far beyond the red edge of pulsational
instability trip. Their effective temperatures are lower than 6700K
with periods in the range from 0.09 to 0.22d. NDSTs have metallicity
close to that of the Sun as expected, while UCVs are slightly metal
poor than NDSTs. The two peaks on the distributions of the period and
stellar atmospheric parameters are all caused by the existence of
UCVs. When those UCVs are excluded, it is discovered that the
effective temperature, the gravitational acceleration, and the
metallicity all are correlated with the pulsating period for NDSTs and
their physical properties and evolutionary states are discussed.
Detection of those UCVs indicates that about 25 per cent of the known
δ Scuti stars may be misclassified. However, if some of them are
confirmed to be pulsating stars, they will be a new-type pulsator and
their investigations will shed light on theoretical instability
domains and on the theories of interacting between the pulsation and
the convection of solar-type stars. Meanwhile, 88 δ Scuti stars
are detected to be the candidates of binary or multiple systems.
Description:
Among 3689 delta Scuti variables listed in VSX catalogue, 766 of them
were observed in LAMOST spectral survey from 2011 October 24 to 2017
June 16. We catalogue those delta Scuti stars and their spectral types
are given. Stellar atmospheric parameters for 525 ones are presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 32 Mean stellar atmospheric parameters for 32
delta Scuti stars observed 4 times or more
and their standard errors
table2.dat 93 131 Stellar atmospheric parameters for the 131 UCVs
detected by LAMOST
table3.dat 93 394 Catalogue of NDSTs observed by LAMOST
table4.dat 61 10 10 delta Scuti variable stars with the
highest metallicities
table5.dat 99 50 50 delta Scuti pulsating stars with the
difference of radial velocity larger than 15km/s
table6.dat 60 38 38 delta Scuti variable stars with radial
velocities higher than 70km/s
table7.dat 76 12 LAMOST observations of delta Scuti variable
stars without periods listed in VSX
lamost.dat 171 1521 Catalogue of delta Scuti pulsating stars
observed by LAMOST (for 774 individual stars)
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See also:
V/153 : LAMOST DR4 catalogs (Luo+, 2018)
V/164 : LAMOST DR5 catalogs (Luo+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Variable star identifier
25- 32 F8.6 d Per Period
34- 35 I2 --- N Number of observation
37- 40 I4 K T Average temperature
42- 44 I3 K e_T rms uncertainty on T
46- 49 F4.2 [cm/s2] logg Average gravitational acceleration
51- 54 F4.2 [cm/s2] e_logg rms uncertainty on logg
56- 60 F5.2 [-] [Fe/H] Average metallicity
62- 65 F4.2 [-] e_[Fe/H] rms uncertainty on [Fe/H]
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 29 A29 --- Name Variable star identifier
31- 39 F9.5 deg RAdeg Right ascension (J2000)
41- 48 F8.5 deg DEdeg Declination (J2000)
50- 60 F11.9 d Period ? Orbital period
62- 63 A2 --- SpType Spectral type
65- 68 I4 K Teff Effective temperature
70- 72 I3 K e_Teff ?=- Error of the effective temperature
74- 77 F4.2 [cm/s2] logg Gravitational acceleration
79- 82 F4.2 [cm/s2] e_logg ?=- Error of the gravitational acceleration
logg
84- 88 F5.2 [-] [Fe/H] Metallicity
90- 93 F4.2 [-] e_[Fe/H] ?=- Error of metallicity
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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- 12 A12 --- Name Variable star identifier
14- 21 F8.4 deg RAdeg Right ascension (J2000)
23- 30 F8.5 deg DEdeg Declination (J2000)
32- 39 F8.6 d Per Period
41- 42 A2 --- SpType Spectral type
44- 47 I4 K Teff Effective temperature
49- 52 F4.2 [cm/s2] logg Gravitational acceleration
54- 57 F4.2 [-] [Fe/H] Metallicity
59- 61 I3 km/s RV Radial velocity
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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- 26 A26 --- Name Variable star identifier
28- 37 F10.8 d Per Period
39- 48 A10 "date" Date1 Lower value of observation date interval
49 A1 --- --- [-]
50- 59 A10 "date" Date2 Upper value of observation date interval
61- 62 I2 --- N Number of observation
64- 67 I4 K Teff Effective temperature
69- 72 F4.2 [cm/s2] logg Gravitational acceleration
74- 78 F5.2 [-] [Fe/H] Metallicity
80- 86 F7.2 km/s VLow Lower velocity value
88- 93 F6.2 km/s VHigh Hight velocity value
95- 99 F5.2 km/s DV Velocity difference
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- Name Variable star identifier
24- 31 F8.6 d Per Period
33- 36 A4 --- SpType Spectral type
38- 41 I4 K Teff Effective temperature
43- 46 F4.2 [cm/s2] logg Gravitational acceleration
48- 52 F5.2 [-] [Fe/H] Metallicity
54- 60 F7.2 km/s RV Radial velocity
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Variable star identifier
20- 28 F9.5 deg RAdeg Right ascension (J2000)
30- 37 F8.5 deg DEdeg Declination (J2000)
39- 48 A10 "date" Obs.date Observation date
50- 53 A4 --- SpType Spectral type
55- 58 I4 K Teff Effective temperature
60- 63 F4.2 [cm/s2] logg Gravitational acceleration
65- 69 F5.2 [-] [Fe/H] Metallicity
71- 76 F6.2 km/s RV Radial velocity
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Byte-by-byte Description of file: lamost.dat
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Bytes Format Units Label Explanations
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1- 30 A30 --- Name Variable star identifier
32- 33 I2 h RAh Right ascension (J2000.0)
34- 35 I2 min RAm Right ascension (J2000.0)
36- 40 F5.2 s RAs Right ascension (J2000.0)
42 A1 --- DE- Declination sign (J2000.0)
43- 44 I2 deg DEd Declination (J2000.0)
45- 46 I2 arcmin DEm Declination (J2000.0)
47- 50 F4.1 arcsec DEs Declination (J2000.0)
52- 72 A21 --- VType Variability type, as in GCVS catalog
74- 85 F12.10 d Porb ? Orbital period in days
86 A1 --- n_Porb Uncertainty flag on Porb
88- 92 F5.3 arcsec Dist Distance between LAMOST and the input object
94-103 A10 "date" Date Observed date
105-114 A10 --- SpType Spectral type
116-122 F7.2 K Teff ? Effective temperature
124-130 F7.2 K e_Teff ?=- Error of the effective temperature
133-137 F5.3 [cm/s2] logg ? Gravitational acceleration
139-143 F5.3 [cm/s2] e_logg ?=- Error of the gravitational acceleration
logg
145-150 F6.3 [-] [Fe/H] ? Metallicity
152-156 F5.3 [-] e_[Fe/H] ?=- Error of metallicity
158-164 F7.2 km/s RV ? Radial velocity
167-171 F5.2 km/s e_RV ?=- Error of radial velocity
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Mar-2021