J/AJ/128/343 Abundances of 10 Cepheids (Luck+, 2004)
Phase-dependent variation of the fundamental parameters of cepheids.
I. Periods from 6 to 10 days.
Luck R.E., Andrievsky S.M.
<Astron. J., 128, 343-356 (2004)>
=2004AJ....128..343L 2004AJ....128..343L
ADC_Keywords: Stars, variable ; Abundances, peculiar ; Spectroscopy
Keywords: Cepheids - stars: abundances
Abstract:
We present the results of a detailed multiphase spectroscopic analysis
of 10 classical Cepheids with pulsation periods between 6 and 10 days.
For each star, we have derived phased values of effective temperature,
surface gravity, microturbulent velocity, and elemental abundances. We
show that the elemental abundance results for intermediate-period
Cepheids are consistent for all pulsational phases.
Description:
Multiphase observations of the program Cepheids were carried out at
McDonald Observatory using the Struve 2.1m reflector and the
Sandiford echelle spectrograph.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 51 10 Cepheid list
table2.dat 61 93 Atmospheric parameters and iron abundances
tablea1.dat 34 17291 Equivalent widths for Cepheids
tablea2.dat 36 2197 Period phase abundance data
tablea3.dat 50 231 Mean [x/H] data for Cepheids
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See also:
J/AJ/129/433 : Abundances & equivalent widths of 14 Cepheids (Kovtyukh+, 2005)
J/AJ/113/1073 : Abundances in Cepheid Variables (Fry+ 1997)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Simbad Cepheid name
10- 11 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
13- 14 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
16- 19 F4.1 s RAs Simbad Second of Right Ascension (J2000.0)
21 A1 --- DE- Simbad Sign of the Declination (J2000.0)
22- 23 I2 deg DEd Simbad Degree of Declination (J2000.0)
25- 26 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
28- 29 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
32- 36 F5.2 mag Bmag Simbad B band magnitude
38- 42 F5.2 mag Vmag Simbad V band magnitude
45- 51 A7 --- SpType Simbad MK spectral type
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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 A8 --- Name Cepheid name
10- 14 F5.3 --- Phase ? Phase
16 A1 --- n_Phase [M] M: iron values are averaged over phase
18- 21 I4 K Teff ? Effective temperature
23- 25 I3 K e_Teff ? Standard deviation in Teff
27- 30 F4.2 [cm/s2] log(g) ? Logarithm of the surface gravity
32- 35 F4.2 km/s VTurb ? Microturbulent velocity
37- 40 F4.2 [---] Fe Mean iron abundance from individual Fe I
lines assuming [Fe]☉ = 7.50.
42- 45 F4.2 [---] e_Fe Standard deviation in Fe
47- 49 I3 --- o_Fe Number of Fe I lines used in Fe
51- 55 F5.3 [---] SE Standard error (sqrt(o_Fe)) of the mean
iron abundance
57- 61 F5.2 [---] DelSe ? Variation of the phase-based Fe abundance
(in units of ioverall σ(Fe))
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Cepheid name
10- 16 F7.2 0.1nm Wave Wavelength in angstroms
18- 22 F5.2 --- ICode Ion code (G1)
24- 28 F5.3 --- Phase Phase
30- 34 F5.1 10-13m EW ? Equivalent width at phase (2)
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Note (2): In units of milliAngstroms.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Cepheid name
11- 15 F5.3 --- Phase Phase
17- 20 F4.1 --- ICode Ion code (G1)
22- 26 F5.2 [Sun] Abd ? [x/H] abundance at Phase for species ICode
28- 32 F5.2 [Sun] e_Abd ? The 1 σ error in Abd
34- 36 I3 --- o_Abd ? Number of lines utilized in Abd
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Cepheid name
10- 11 A2 --- El Element (x)
13- 17 F5.2 [Sun] Mean Mean [x/H] value
20- 23 F4.2 [Sun] e_Mean Standard Error on Mean
25- 29 F5.2 [Sun] Median Median [x/H] value
32- 35 F4.2 [Sun] e_Median Standard Deviation on Median
38- 41 F4.2 [Sun] Maximum Maximun [x/H] value
43- 47 F5.2 [Sun] Minimum Minimum [x/H] value
49- 50 I2 --- Count Count for [x/H] value
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Global Notes:
Note (G1): ICode = XX.Y where
XX is the atomic number and Y is the ionization;
hence, 12.0 is Mg I.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 22-Jan-2007