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J/A+A/305/551 Chemical composition of the s-Cepheids (Andrievsky+, 1996)
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The chemical composition of the s-Cepheids. II
Andrievsky S.M., Kovtyukh V.V, Usenko I.A.
<Astron. Astrophys. 305, 551 (1996)>
=1996A&A...305..551A (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, variable ; Abundances
Keywords: stars: abundances - stars: Cepheids - stars: evolution
Description:
On the base of photographic, Reticon and CCD spectra analysis we have
derived the abundances for 8 s-Cepheids and V1162 Aql (before
classified as s-Cepheid). The following results have been obtained:
1) all Cepheids (excluding only EU Tau) have solar-like abundances of
{alpha}- and iron-group elements, 2) Na is over abundant for all
program stars, 3) the carbon deficiency found for EU Tau, DT Cyg, V440
Per and nitrogen overabundance (DT Cyg), show that these s-Cepheids
are not crossing the instability strip for first time, 4) s-process
elements are slightly enhanced in the program stars, 5) V1162 Aql does
not show any changes in C and N abundances. The most plausible
explanation is that this star is a normal Cepheid (C{delta}), but it
is firstly crossing the instability strip toward the giant branch.
This conclusion is also confirmed by its position on the evolutionary
diagram.
Objects:
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RA (2000) DE Names
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02 23 51.7 +55 21 53 V440 Per = HD 14662
02 51 58.7 +68 53 19 SU Cas = HD 17463
04 37 14.7 +18 32 35 SZ Tau = HD 29260
05 45 40.5 +18 39 25 EU Tau = HD 38321
17 52 38.6 -06 08 37 Y Oph = HD 162714
18 58 14.6 +17 21 40 FF Aql = HD 176155
21 06 30.1 +31 11 05 DT Cyg = HD 201078
21 19 22.1 +38 14 15 V1334 Cyg = HD 203156
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table10 40 25 Abundances for SU Cas.
table11 46 19 Abundances for EU Tau.
table12 54 35 Abundances for DT Cyg.
table13 34 15 Abundances for SZ Tau.
table14 20 26 Abundances for V 1334 Cyg.
table15 34 25 Abundances for FF Aql.
table16 20 25 Abundances for V1162 Aql.
table17 67 28 Abundances for V440 Per.
table18 20 26 Abundances for Y Oph.
tables.tex 69 375 LaTeX version of tables
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Byte-by-byte Description of file: table10
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Bytes Format Units Label Explanations
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2- 6 A5 --- Element Element
8- 12 F5.2 Sun [X/H]1 Abundance of the element for phase=0.477
14- 17 F4.2 Sun e_[X/H]1 []? Error on abundance
19- 20 I2 --- o_[X/H]1 Number of observations
22- 26 F5.2 Sun [X/H]2 Abundance of the element for phase=0.627
28- 31 F4.2 Sun e_[X/H]2 []? Error on abundance
33- 34 I2 --- o_[X/H]2 Number of observations
36- 40 F5.2 Sun [X/H]LL81 []? Abundance of the element from
Luck and Lambert 1981
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Byte-by-byte Description of file: table11
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Bytes Format Units Label Explanations
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2- 6 A5 --- Element Element
8- 12 F5.2 Sun [X/H]1 []? Abundance of the element for phase=0.297
14- 17 F4.2 Sun e_[X/H]1 []? Error on abundance
19 I1 --- o_[X/H]1 []? Number of observations
21- 25 F5.2 Sun [X/H]2 []? Abundance of the element for phase=0.323
27- 30 F4.2 Sun e_[X/H]2 []? Error on abundance
32- 33 I2 --- o_[X/H]2 []? Number of observations
35- 39 F5.2 Sun [X/H]3 []? Abundance of the element for phase=0.758
41- 44 F4.2 Sun e_[X/H]3 []? Error on abundance
46 I1 --- o_[X/H]3 []? Number of observations
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Byte-by-byte Description of file: table12
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Bytes Format Units Label Explanations
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2- 6 A5 --- Element Element
8- 12 F5.2 Sun [X/H]1 []? Abundance of the element for phase=0.155
14- 17 F4.2 Sun e_[X/H]1 []? Error on abundance
19- 20 I2 --- o_[X/H]1 []? Number of observations
22- 26 F5.2 Sun [X/H]2 []? Abundance of the element for phase=0.774
28- 31 F4.2 Sun e_[X/H]2 []? Error on abundance
33- 34 I2 --- o_[X/H]2 []? Number of observations
36- 40 F5.2 Sun [X/H]3 []? Abundance of the element for phase=0.814
42- 45 F4.2 Sun e_[X/H]3 []? Error on abundance
47- 48 I2 --- o_[X/H]3 []? Number of observations
50- 54 F5.2 Sun [X/H]LL81 []? Abundance of the element from
Luck and Lambert 1981
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Byte-by-byte Description of file: table13
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Bytes Format Units Label Explanations
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2- 6 A5 --- Element Element
8- 12 F5.2 Sun [X/H]1 []? Abundance of the element for phase=0.119
14- 17 F4.2 Sun e_[X/H]1 []? Error on abundance
19- 20 I2 --- o_[X/H]1 []? Number of observations
22- 26 F5.2 Sun [X/H]2 []? Abundance of the element for phase=0.501
28- 31 F4.2 Sun e_[X/H]2 []? Error on abundance
33- 34 I2 --- o_[X/H]2 []? Number of observations
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Byte-by-byte Description of file: table14, table16, table18
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Bytes Format Units Label Explanations
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2- 6 A5 --- Element Element
8- 12 F5.2 Sun [X/H] Abundance of the element
14- 17 F4.2 Sun e_[X/H] []? Error on abundance
19- 20 I2 --- o_[X/H] Number of observations
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Byte-by-byte Description of file: table15
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Bytes Format Units Label Explanations
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2- 6 A5 --- Element Element
8- 12 F5.2 Sun [X/H]1 []? Abundance of the element for phase=0.780
14- 17 F4.2 Sun e_[X/H]1 []? Error on abundance
19- 20 I2 --- o_[X/H]1 []? Number of observations
22- 26 F5.2 Sun [X/H]2 []? Abundance of the element for phase=0.864
28- 31 F4.2 Sun e_[X/H]2 []? Error on abundance
33- 34 I2 --- o_[X/H]2 []? Number of observations
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Byte-by-byte Description of file: table17
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Bytes Format Units Label Explanations
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2- 6 A5 --- Element Element
8- 12 F5.2 Sun [X/H]1 []? Abundance of the element for phase=0.080
14- 17 F4.2 Sun e_[X/H]1 []? Error on abundance
19- 20 I2 --- o_[X/H]1 []? Number of observations
22- 26 F5.2 Sun [X/H]2 []? Abundance of the element for phase=0.218
28- 31 F4.2 Sun e_[X/H]2 []? Error on abundance
33 I1 --- o_[X/H]2 []? Number of observations
35- 39 F5.2 Sun [X/H]3 []? Abundance of the element for phase=0.374
41- 44 F4.2 Sun e_[X/H]3 []? Error on abundance
46- 47 I2 --- o_[X/H]3 []? Number of observations
49- 53 F5.2 Sun [X/H]4 Abundance of the element for phase=0.385
55- 58 F4.2 Sun e_[X/H]4 []? Error on abundance
60- 61 I2 --- o_[X/H]4 Number of observations
63- 67 F5.2 Sun [X/H]L82 []? Abundance of the element from Luck 1982
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References:
Luck R.E. and Lambert D.L. 1981, ApJ, 245, 1018 =1981ApJ...245.1018L
Luck R.E. 1982, ApJ, 259, 792 =1982ApJ...259..792L
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(End) Simona Mei [CDS] 07-Jun-1995