J/MNRAS/486/3266 Chemical analysis of CH stars (Purandardas+, 2019)
Chemical analysis of CH stars.
III. Atmospheric parameters and elemental abundances.
Purandardas M., Goswami A., Goswami P.P., Shejeelammal J., Masseron T.
<Mon. Not. R. Astron. Soc., 486, 3266-3289 (2019)>
=2019MNRAS.486.3266P 2019MNRAS.486.3266P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, peculiar ; Abundances ; Effective temperatures ;
Radial velocities ; Optical
Keywords: stars: abundances - stars: carbon - stars: chemically peculiar
Abstract:
Elemental abundances of CH stars can provide observational constraints
for theoretical studies on the nucleosynthesis and evolution of low-
and intermediate-mass stars. However, available abundance data in
literature are quite scanty. In our pursuit to generate a homogeneous
data base of elemental abundances of CH stars we have performed a
detailed chemical abundance study for a sample of 12 potential CH star
candidates based on high-resolution spectroscopy. We present first
time abundance analysis for the objects HE0308-1612, CD-281082,
HD30443, and HD87853. For the other objects, although limited
information is available, detailed chemical composition studies are
missing. Our analysis shows CD-281082 to be a very metal-poor object
with [Fe/H]=-2.45 and enriched in carbon with [C/Fe]=2.19. With a
ratio of [Ba/Eu]∼0.02 the star satisfies the classification criteria
of a CEMP-r/s star. The objects CD-382151 with [Fe/H]=-2.03 and
HD30443 with [Fe/H]~-1.68 are found to show the characteristic
properties of CH stars. HE0308-1612 and HD87853 are found to be
moderately metal poor with [Fe/H]~-0.73; while HE0308-1612 is
moderately enhanced with carbon ([C/Fe]∼0.78) and shows the spectral
properties of CH stars, the abundance of carbon could not be estimated
for HD87853. Among the two moderately metal-poor objects, HD87080
([Fe/H]=-0.48) shows near solar carbon abundance, and HD176021
([Fe/H]=-0.63) is mildly enhanced in carbon with [C/Fe]=0.52. HD176021
along with HD202020 a known binary, exhibit the characteristic
properties of CH stars as far as the heavy element abundances are
concerned. Five objects in our sample show spectral properties that
are normally seen in barium stars.
Description:
Abundance analysis results of 12 potential CH star candidates, 11 from
the CH stars catalogue of Bartkevicious (1996BaltA...5..217B 1996BaltA...5..217B) and one
object HE 0308-1612 from Goswami et al. (2010MNRAS.402.1111G 2010MNRAS.402.1111G) are
presented. Detailed analysis shows two of them, CD-28 1082 and CD-38
2151 to be very metal-poor and highly enhanced in carbon. Five objects
HE 0308-1612, HD 30443, HD 87853, HD 176021, and HD 202020 show
characteristic properties of CH stars. Estimated C/O ratios for these
objects are similar to those generally noticed in CH stars. While HE
0308-1612 and HD 30443 are CH giants, HD 87853, and HD 176021 are CH
subgiants, and HD 202020 is in turn-off stage. The abundance patterns
of these stars match well with the abundance patterns of CH stars from
literature.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 95 18 Basic data for the programme stars
table2.dat 97 12 Temperatures from photometry
table3.dat 79 16 Derived atmospheric parameters and radial
velocities of the programme stars
table4.dat 77 12 Estimates of logg using parallax method
table5.dat 43 22 Comparison of our estimated stellar parameters
with literature values
table6.dat 40 12 Estimates of [Fe/H], [ls/Fe], [hs/Fe], [hs/ls],
and C/O
table7.dat 93 12 Spatial velocity and probability estimates for
the programme stars
table8.dat 85 22 Comparison of the abundances of our programme
stars with the literature values
tablea1.dat 91 29 Elemental abundances in HE 0308-1612,
CD 28 1082, and HD 29370
tablea2.dat 92 29 Elemental abundances in HD 30443, CD-38 2151,
and HD 50264
tablea3.dat 91 29 Elemental abundances in HD 87080, HD 87853,
and HD 123701
tablea4.dat 92 29 Elemental abundances in HD 176021, HD 188985,
and HD 202020
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
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- 43 F5.2 mag Bmag Magnitude on the B-band
45- 49 F5.2 mag Vmag ? Magnitude on the V-band
51- 55 F5.2 mag Jmag Magnitude on the J-band
57- 60 F4.2 mag Hmag Magnitude on the H-band
62- 65 F4.2 mag Kmag Magnitude on the K-band
67- 70 I4 s Texp Exposure time
72 I1 --- Nfr ? Number of frames taken
74- 83 A10 --- Date Date of observation (D-M-Y)
85- 95 A11 --- Inst Source of spectrum (1)
--------------------------------------------------------------------------------
Note (1): PIs of the original observing proposals are V. Hill for FEROS 1999
spectra, F. Primas for FEROS 2000 spectra, and A. Goswami for VBT
Echelle and HESP spectra
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Source name
14- 20 F7.2 K TeffJK ? Photometric effective temperature estimated
using (J-K) colour as temperature indicator
22- 28 F7.2 K TeffJH1 ? Photometric effective temperature estimated
using (J-H) colour as temperature indicator
and [Fe/H]=-0.05
30- 36 F7.2 K TeffJH2 ? Photometric effective temperature estimated
using (J-H) colour as temperature indicator
and [Fe/H]=-0.5
38- 44 F7.2 K TeffJH3 ? Photometric effective temperature estimated
using (J-H) colour as temperature indicator
and [Fe/H]=-1.5
46- 52 F7.2 K TeffVK1 ? Photometric effective temperature estimated
using (V-K) colour as temperature indicator
and [Fe/H]=-0.05
54- 60 F7.2 K TeffVK2 ? Photometric effective temperature estimated
using (V-K) colour as temperature indicator
and [Fe/H]=-0.5
62- 68 F7.2 K TeffVK3 ? Photometric effective temperature estimated
using (V-K) colour as temperature indicator
and [Fe/H]=-1.5
70- 76 F7.2 K TeffBV1 ? Photometric effective temperature estimated
using (B-V) colour as temperature indicator
and [Fe/H]=-0.05
78- 84 F7.2 K TeffBV2 ? Photometric effective temperature estimated
using (B-V) colour as temperature indicator
and [Fe/H]=-0.5
86- 92 F7.2 K TeffBV3 ? Photometric effective temperature estimated
using (B-V) colour as temperature indicator
and [Fe/H]=-1.5
94- 97 I4 K Teffsp Estimated spectroscopic temperature
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
14- 17 I4 K Teff Effective temperature (1)
19- 22 F4.2 [cm/s2] loggsp Surface gravity (2)
24- 27 F4.2 km/s vt Microturbulent velocity (3)
29- 33 F5.2 [-] [FeI/H] FeI to hydrogen abundance ratio
35- 38 F4.2 [-] e_[FeI/H] Error on [FeI/H]
40- 44 F5.2 [-] [FeII/H] FeII to hydrogen abundance ratio
46- 49 F4.2 [-] e_[FeII/H] ? Error on [FeII/H]
51- 56 F6.2 km/s RV Radial velocity estimated in this work
58- 61 F4.2 km/s e_RV Error on RV
63- 67 A5 --- n_RV Instrument used to estimate RV
69- 74 F6.2 km/s RVlit ? Radial velocity from litterature
76- 79 F4.2 km/s e_RVlit ? Error on RVlit
--------------------------------------------------------------------------------
Note (1): A trend between the iron abundance derived from the FeI lines and the
excitation potential of these lines with a zero slope defines the
effective temperature
Note (2): The microturbulent velocity is taken to be that value for which the
abundances derived from the FeI lines do not show any dependence on
the reduced equivalent width
Note (3): The surface gravity logg is determined corresponding to the adopted
values of the effective temperature and microturbulent velocity for
which FeI and FeII lines give near equal abundance values
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
14- 18 F5.2 mas plx Parallax from Gaia DR2 (Gaia Collaboration
2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345)
20- 23 F4.2 mas e_plx Error on plx
25- 29 F5.2 mag Mbol ? Bolometric magnitude
31- 34 F4.2 mag e_Mbol ? Error on Mbol
36- 40 F5.2 [Lsun] logLstar ? Star luminosity
42- 46 F5.3 [Lsun] e_logLstar ? Error on Lstar
48- 51 F4.2 [Msun] logMstar ? Star mass (1)
53- 56 F4.2 [Msun] e_logMstar ? Error on Mstar
58- 61 F4.2 [cm/s2] logg ? Surface gravity estimated using the
parallax method (2)
63- 67 F5.3 [cm/s2] e_logg ? Error on logg
69- 72 F4.2 [cm/s2] loggsp Spectroscopic surface gravity
74- 77 F4.2 Gyr Age ? Star age derived from the star location
in the HR diagram
--------------------------------------------------------------------------------
Note (1): We made use of Girardi et al. (2000A&AS..141..371G 2000A&AS..141..371G) data base
(http://pleiadi.pd.astro.it/) of evolutionary tracks to estimate the
mass of the stars
Note (2): Surface gravity logg is calculated from the estimated mass using the
relation: log(g/g☉)=log(Mstar/M☉)+4log(Teff/Teff☉)+
0.4(Mbol-Mbol☉)
The adopted values for the Sun are logg☉=4.44, Teff☉=5770K
and Mbol☉=4.75mag (Yang et al. 2016AcSpA.167...19Y 2016AcSpA.167...19Y).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
14- 17 I4 K Teff Effective temperature
19- 22 F4.2 [cm/s2] logg Surface gravity
24- 27 F4.2 km/s vt Microturbulent velocity
29- 33 F5.2 [-] [FeI/H] FeI to hydrogen abundance ratio
35 A1 --- f_[FeI/H] [a] Flag on [FeI/H] (1)
37- 41 F5.2 [-] [FeII/H] ? FeII to hydrogen abundance ratio
43 I1 --- Ref References for the presented stellar
parameters (2)
--------------------------------------------------------------------------------
Note (1): Flag as follows:
a = Vanture (1992AJ....104.1986V 1992AJ....104.1986V) value refers to [Fe/H]
Note (2): References as follows:
1 = Our work
2 = de Castro et al. (2016MNRAS.459.4299D 2016MNRAS.459.4299D)
3 = Vanture (1992AJ....104.1986V 1992AJ....104.1986V)
4 = Pereira & Junqueira (2003A&A...402.1061P 2003A&A...402.1061P)
5 = Allen & Barbuy (2006A&A...454..895A 2006A&A...454..895A)
6 = Sneden & Bond (1976ApJ...204..810S 1976ApJ...204..810S)
7 = North et al. (1994A&A...281..775N 1994A&A...281..775N, 1994A&AS..103..321N 1994A&AS..103..321N)
8 = Luck & Bond (1991ApJS...77..515L 1991ApJS...77..515L)
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Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
14- 18 F5.2 [-] [Fe/H] Iron to hydrogen abundance ratio
20- 24 F5.2 [-] [ls/Fe] Light s-process elements (Sr,Y,Zr)
to iron abundance ratio
26- 29 F4.2 [-] [hs/Fe] Heavy s-process elements (Ba, La, Ce, Nd, Sm)
to iron abundance ratio
31- 35 F5.2 [-] [hs/ls] Light to heavy s-process elements abundance
ratio
37- 40 F4.2 [-] [C/O] ? Carbon to oxygen abundance ratio
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
14- 20 F7.2 km/s ULSR U-component of space velocity relative to the
local standard of rest (LSR)
22- 26 F5.2 km/s e_ULSR Error on ULSR
28- 34 F7.2 km/s VLSR V-component of space velocity relative to the
local standard of rest (LSR)
36- 40 F5.2 km/s e_VLSR Error on VLSR
42- 47 F6.2 km/s WLSR W-component of space velocity relative to the
local standard of rest (LSR)
49- 53 F5.2 km/s e_WLSR Error on WLSR
55- 60 F6.2 km/s Vtot Total space velocity
62- 66 F5.2 km/s e_Vtot Error on Vtot
68- 71 F4.2 --- pthin Probability for a star's membership into the
thin disc (1)
73- 77 F5.3 --- pthick Probability for a star's membership into the
thick disc (1)
79- 82 F4.2 --- phalo Probability for a star's membership into the
halo (1)
84- 93 A10 --- Pop Population
--------------------------------------------------------------------------------
Note (1): The probability for a star's membership into the thin disc, the thick
disc, or the halo population are also calculated following the
procedures of Reddy, Lambert & Priesto (2006MNRAS.367.1329R 2006MNRAS.367.1329R),
Bensby et al. (2003A&A...410..527B 2003A&A...410..527B, 2004A&A...415..155B 2004A&A...415..155B) and
Mishenina et al. (2004A&A...418..551M 2004A&A...418..551M)
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Star name
14- 18 F5.2 [-] [FeI/H] ? FeI to hydrogen abundance ratio
20- 24 F5.2 [-] [FeII/H] ? FeII to hydrogen abundance ratio
26- 30 F5.2 [-] [Fe/H] ? Iron to hydrogen abundance ratio
32- 35 F4.2 [-] [Sr/Fe] ? Sr to iron abundance ratio
37- 41 F5.2 [-] [Y/Fe] Y to iron abundance ratio
43- 46 F4.2 [-] [Zr/Fe] ? Zr to iron abundance ratio
48- 52 F5.2 [-] [BaII/Fe] ? BaII to iron abundance ratio
54- 57 F4.2 [-] [LaII/Fe] ? LaII to iron abundance ratio
59- 62 F4.2 [-] [CeII/Fe] ? CeII to iron abundance ratio
64- 67 F4.2 [-] [PrII/Fe] ? PrII to iron abundance ratio
69- 72 F4.2 [-] [NdII/Fe] NdII to iron abundance ratio
74- 78 F5.2 [-] [SmII/Fe] ? SmII to iron abundance ratio
80- 83 F4.2 [-] [EuII/Fe] ? EuII to iron abundance ratio
85 I1 --- Ref References (1)
--------------------------------------------------------------------------------
Note (1): References as follows:
1 = Our work
2 = de Castro (2016MNRAS.459.4299D 2016MNRAS.459.4299D)
3 = Vanture (1992AJ....104.1986V 1992AJ....104.1986V)
4 = Pereira & Junqueira (2003A&A...402.1061P 2003A&A...402.1061P)
5 = Allen & Barbuy (2006A&A...454..895A 2006A&A...454..895A)
6 = Sneden & Bond (1976ApJ...204..810S 1976ApJ...204..810S)
7 = North et al. (1994A&AS..103..321N 1994A&AS..103..321N)
8 = Luck & Bond (1991ApJS...77..515L 1991ApJS...77..515L)
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Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Ion Ion
7- 8 I2 --- Z Ion number
10- 13 F4.2 [-] logepsS Solar abundance (G1)
15- 18 F4.2 --- logeps1 ?=- HE 0308-1612 logε abundance
20- 23 F4.2 --- e_logeps1 ?=- HE 0308-1612 logε abundance
24 A1 --- n_logeps1 [s] s for synth
25- 26 I2 --- o_logeps1 ? Number of lines used for the logeps1
determination
27 A1 --- --- [)]
29- 33 F5.2 --- [X/H]1 ?=- HE 0308-1612 [X/H] abundance
35- 39 F5.2 --- [X/Fe]1 ?=- HE 0308-1612 [X/Fe] abundance
41- 45 F5.2 --- logeps2 ?=- CD 28 1082 logε abundance
47- 50 F4.2 --- e_logeps2 ? CD 28 1082 logε abundance
51 A1 --- n_logeps2 [s] s for synth
52- 53 I2 --- o_logeps2 ? Number of lines used for the logeps2
determination
54 A1 --- --- [)]
56- 60 F5.2 --- [X/H]2 ?=- CD 28 1082 [X/H] abundance
62- 65 F4.2 --- [X/Fe]2 ?=- CD 28 1082 [X/Fe] abundance
67- 70 F4.2 --- logeps3 ?=- HD 29370 logε abundance
72- 75 F4.2 --- e_logeps3 ? HD 29370 logε abundance
76 A1 --- n_logeps3 [s] s for synth
77- 78 I2 --- o_logeps3 ? Number of lines used for the logeps3
determination
79 A1 --- --- [)]
81- 85 F5.2 --- [X/H]3 ?=- HD 29370 [X/H] abundance
87- 91 F5.2 --- [X/Fe]3 ?=- HD 29370 [X/Fe] abundance
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Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Ion Ion
7- 8 I2 --- Z Ion number
10- 13 F4.2 [-] logepsS Solar abundance (G1)
15- 18 F4.2 --- logeps ?=- HD 30443 logε abundance
20- 23 F4.2 --- e_logeps ?=- HD 30443 logε abundance
24 A1 --- n_logeps [s] s for synth
25- 26 I2 --- o_logeps ? Number of lines used for the logeps4
determination
27 A1 --- --- [)]
29- 33 F5.2 --- [X/H]4 ?=- HD 30443 [X/H] abundance
35- 39 F5.2 --- [X/Fe]4 ?=- HD 30443 [X/Fe] abundance
41- 45 F5.2 --- logeps5 ?=- CD-38 2151 logε abundance
47- 50 F4.2 --- e_logeps5 ? CD-38 2151 logε abundance
51 A1 --- n_logeps5 [s] s for synth
52- 53 I2 --- o_logeps5 ? Number of lines used for the logeps5
determination
54 A1 --- --- [)]
56- 60 F5.2 --- [X/H]5 ?=- CD-38 2151 [X/H] abundance
62- 66 F5.2 --- [X/Fe]5 ?=- CD-38 2151 [X/Fe] abundance
68- 71 F4.2 --- logeps6 ?=- HD 50264 logε abundance
73- 76 F4.2 --- e_logeps6 ? HD 50264 logε abundance
77 A1 --- n_logeps6 [s] s for synth
78- 79 I2 --- o_logeps6 ? Number of lines used for the logeps6
determination
80 A1 --- --- [)]
82- 86 F5.2 --- [X/H]6 ?=- HD 50264 [X/H] abundance
88- 92 F5.2 --- [X/Fe]6 ?=- HD 50264 [X/Fe] abundance
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Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Ion Ion
7- 8 I2 --- Z Ion number
10- 13 F4.2 [-] logepsS Solar abundance (G1)
15- 18 F4.2 --- logeps7 ?=- HD 87080 logε abundance
20- 23 F4.2 --- e_logeps7 ?=- HD 87080 logε abundance
24 A1 --- n_logeps7 [s] s for synth
25- 26 I2 --- o_logeps7 ? Number of lines used for the logeps7
determination
27 A1 --- --- [)]
29- 33 F5.2 --- [X/H]7 ?=- HD 87080 [X/H] abundance
35- 39 F5.2 --- [X/Fe]7 ?=- HD 87080 [X/Fe] abundance
41- 44 F4.2 --- logeps8 ?=- HD 87853 logε abundance
46- 49 F4.2 --- e_logeps8 ? HD 87853 logε abundance
50 A1 --- n_logeps8 [s] s for synth
51- 52 I2 --- o_logeps8 ? Number of lines used for the logeps8
determination
53 A1 --- --- [)]
55- 59 F5.2 --- [X/H]8 ?=- HD 87853 [X/H] abundance
61- 65 F5.2 --- [X/Fe]8 ?=- HD 87853 [X/Fe] abundance
67- 70 F4.2 --- logeps9 ?=- HD 123701 logε abundance
72- 75 F4.2 --- e_logeps9 ? HD 123701 logε abundance
76 A1 --- n_logeps9 [s] s for synth
77- 78 I2 --- o_logeps9 ? Number of lines used for the logeps9
determination
79 A1 --- --- [)]
81- 85 F5.2 --- [X/H]9 ?=- HD 123701 [X/H] abundance
87- 91 F5.2 --- [X/Fe]9 ?=- HD 123701 [X/Fe] abundance
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Ion Ion
7- 8 I2 --- Z Ion number
10- 13 F4.2 [-] logepsS Solar abundance (G1)
15- 18 F4.2 --- logeps10 ?=- HD 176021 logε abundance
20- 23 F4.2 --- e_logeps10 ?=- HD 176021 logε abundance
24 A1 --- n_logeps10 [s] s for synth
25- 26 I2 --- o_logeps10 ? Number of lines used for the logeps10
determination
27 A1 --- --- [)]
29- 33 F5.2 --- [X/H]10 ?=- HD 176021 [X/H] abundance
35- 39 F5.2 --- [X/Fe]10 ?=- HD 176021 [X/Fe] abundance
41- 44 F4.2 --- logeps11 ?=- HD 188985 logε abundance
46- 49 F4.2 --- e_logeps11 ? HD 188985 logε abundance
50 A1 --- n_logeps11 [s] s for synth
51- 52 I2 --- o_logeps11 ? Number of lines used for the logeps11
determination
53 A1 --- --- [)]
55- 59 F5.2 --- [X/H]11 ?=- HD 188985 [X/H] abundance
61- 65 F5.2 --- [X/Fe]11 ?=- HD 188985 [X/Fe] abundance
67- 70 F4.2 --- logeps12 ?=- HD 202020 logε abundance
72- 75 F4.2 --- e_logeps12 ? HD 202020 logε abundance
76 A1 --- n_logeps12 [s] s for synth
77- 79 I3 --- o_logeps12 ? Number of lines used for the logeps12
determination
80 A1 --- --- [)]
82- 86 F5.2 --- [X/H]12 ?=- HD 202020 [X/H] abundance
88- 92 F5.2 --- [X/Fe]12 ?=- HD 202020 [X/Fe] abundance
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Global notes:
Note (G1): Asplund (2009ARA&A..47..481A 2009ARA&A..47..481A).
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 24-Oct-2022