J/AJ/142/51 Galactic Cepheids abundance variations (Luck+, 2011)
The distribution of the elements in the Galactic disk.
II. Azimuthal and radial variation in abundances from Cepheids.
Luck R.E., Andrievsky S.M., Kovtyukh V.V., Gieren W., Graczyk D.
<Astron. J., 142, 51 (2011)>
=2011AJ....142...51L 2011AJ....142...51L
ADC_Keywords: Stars, variable; Abundances
Keywords: Galaxy: abundances - Galaxy: evolution - stars: abundances -
stars: variables: Cepheids
Abstract:
This paper reports on the spectroscopic investigation of 101 Cepheids
in the Carina region. These Cepheids extend previous samples by about
35% in number and increase the amount of the Galactic disk coverage
especially in the direction of l≈270°. The new Cepheids do not
add much information to the radial gradient, but provide a substantial
increase in azimuthal coverage. We find no azimuthal dependence in
abundance over an 80° angle from the Galactic center in an annulus
of 1kpc depth centered on the Sun. A simple linear fit to the Cepheid
data yields a gradient d[Fe/H]/dRG=-0.055±0.003dex/kpc which is
somewhat shallower than found from our previous, smaller Cepheid
sample.
Description:
High signal-to-noise spectra were obtained in the period 2010 March
25-April 1 using the 2.2m MPG telescope and FEROS spectrograph at ESO
La Silla.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 102 Program stars
table2.dat 59 102 Stellar parameter and iron abundance details
table3.dat 55 182 Distance information for Cepheids in Papers I-VI
table4.dat 185 270 Abundance data for Cepheids: Carbon (Z=6) through
gadolinium (Z=64)
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See also:
J/A+A/392/491 : Galactic abundance gradient. III. (Andrievsky+, 2002)
J/A+A/381/32 : Galactic Cepheid abundances (Andrievsky+, 2002)
J/A+A/413/159 : Galactic abundance gradient. V. (Andrievsky+, 2004)
J/AJ/132/902 : Abundances of 54 Cepheids (Luck+, 2006)
Byte-by-byte Description of file: table[13].dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Cepheid name
11- 16 A6 --- Type Cepheid type (1)
18- 23 F6.3 d P Period (2)
25- 29 F5.2 mag VMAG Absolute V band magnitude (3)
31- 35 F5.2 mag <Vmag> Intensity mean apparent V band magnitude (4)
37- 41 F5.3 mag E(B-V) The (B-V) color excess (5)
43- 48 F6.3 kpc Dist Distance
50- 55 F6.3 kpc RGal Galactic radius (6)
58- 67 A10 "YYYY/MM/DD" ObsDate ? Date of the observation; UT (table1 only)
69- 73 F5.3 --- Phase ? Phase during observation (table1 only)
75- 78 I4 s Exp ? Exposure time (table1 only)
80- 82 I3 --- S/N ? Signal to noise (table1 only) (7)
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Note (1): Variability type from the General Catalog of Variable Stars
(Samus et al. 2007-2009, Cat. B/gcvs)
Note (2): from Berdnikov (2006 - private communication to S. Andrievsky)
or GCVS (Cat. B/gcvs).
Note (3): Computed assuming that the listed period is the fundamental
except for DCEPS (first overtone pulsators) where the fundamental
period is assumed to be P0=P/0.71 if P is the observed period.
Period-Luminosity relation and R(=Av/E(B-V))=3.23 from Fouque et
al. (2007, Cat. J/A+A/476/73).
Note (4): From Fernie (1995AJ....110.2361F 1995AJ....110.2361F). Exception is NT Pup which is
from Yong et al. (2006AJ....131.2256Y 2006AJ....131.2256Y).
Note (5): From Fouque et al. (2007, Cat. J/A+A/476/73) or Fernie
(1995AJ....110.2361F 1995AJ....110.2361F) as modified by Fouque et al. (2007, Cat.
J/A+A/476/73). Reddening for CE Pup, HQ Car, and NT Pup from Yong
et al. (2006AJ....131.2256Y 2006AJ....131.2256Y). FI Car reddening from van Leeuwen et al.
(2007MNRAS.379..723V 2007MNRAS.379..723V) and T Ant reddening from Turner & Berdnikov
(2003A&A...407..325T 2003A&A...407..325T).
Note (6): The Sun is assumed to be 7.9kpc from the galactic center
(McNamara et al., 2000PASP..112..202M 2000PASP..112..202M).
Note (7): (per pixel) near 500nm at order center.
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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- 9 A9 --- Name Cepheid name
10 A1 --- m_Name [1/2] Observation number
(for stars observed twice)
12- 15 I4 K Teff Effective temperature (1)
17- 19 I3 K e_Teff Standard deviation of Teff
21- 22 I2 --- o_Teff Number of ratios utilized to determine Teff
24- 26 F3.1 [cm/s2] log(g) log of the surface gravity
28- 30 F3.1 km/s Vturb Microturbulent velocity ξ
32- 36 F5.2 [Sun] FeI The [Fe/H] as determined from the Fe I lines
38- 41 F4.2 [Sun] e_FeI Standard deviation of FeI
43- 45 I3 --- o_FeI Number of lines utilized to determine FeI
47- 51 F5.2 [Sun] FeII The [Fe/H] as determined from the Fe II lines
53- 56 F4.2 [Sun] e_FeII Standard deviation of FeII
58- 59 I2 --- o_FeII Number of lines utilized to determine FeII
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Note (1): Determined using the line ratio method of Kovtyukh
(2007MNRAS.378..617K 2007MNRAS.378..617K).
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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- 9 A9 --- Name Cepheid name
11- 14 A4 --- Ref Reference code (1)
16- 17 I2 --- NSp Total number of spectra (phases) contributing
to abundances
19- 23 F5.2 [Sun] [C/H] ? log Carbon abundance relative to solar
25- 29 F5.2 [Sun] [N/H] ? log Nitrogen abundance relative to solar
31- 35 F5.2 [Sun] [O/H] ? log Oxygen abundance relative to solar
37- 41 F5.2 [Sun] [Na/H] ? log Sodium abundance relative to solar
43- 47 F5.2 [Sun] [Mg/H] ? log Magnesium abundance relative to solar
49- 53 F5.2 [Sun] [Al/H] ? log Aluminium abundance relative to solar
55- 59 F5.2 [Sun] [Si/H] ? log Silicon abundance relative to solar
61- 65 F5.2 [Sun] [S/H] ? log Sulfur abundance relative to solar
67- 71 F5.2 [Sun] [Ca/H] ? log Calcium abundance relative to solar
73- 77 F5.2 [Sun] [Sc/H] ? log Scandium abundance relative to solar
79- 83 F5.2 [Sun] [Ti/H] ? log Titanium abundance relative to solar
85- 89 F5.2 [Sun] [V/H] ? log Vanadium abundance relative to solar
91- 95 F5.2 [Sun] [Cr/H] ? log Chromium abundance relative to solar
97-101 F5.2 [Sun] [Mn/H] ? log Manganese abundance relative to solar
103-107 F5.2 [Sun] [Fe/H] log Iron abundance relative to solar
109-113 F5.2 [Sun] [Co/H] ? log Cobalt abundance relative to solar
115-119 F5.2 [Sun] [Ni/H] log Nickel abundance relative to solar
121-125 F5.2 [Sun] [Cu/H] ? log Copper abundance relative to solar
127-131 F5.2 [Sun] [Zn/H] ? log Zinc abundance relative to solar
133-137 F5.2 [Sun] [Y/H] ? log Yttrium abundance relative to solar
139-143 F5.2 [Sun] [Zr/H] ? log Zirconium abundance relative to solar
145-149 F5.2 [Sun] [La/H] ? log Lanthanum abundance relative to solar
151-155 F5.2 [Sun] [Ce/H] ? log Cerium abundance relative to solar
157-161 F5.2 [Sun] [Pr/H] ? log Praseodymium abundance relative to solar
163-167 F5.2 [Sun] [Nd/H] ? log Neodymium abundance relative to solar
169-173 F5.2 [Sun] [Sm/H] ? log Samarium abundance relative to solar
175-179 F5.2 [Sun] [Eu/H] ? log Europium abundance relative to solar
181-185 F5.2 [Sun] [Gd/H] ? log Gadolinium abundance relative to solar
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Note (1): References as follows:
1 = Andrievsky et al. (2002A&A...384..140A 2002A&A...384..140A (Paper I))
2 = Andrievsky et al. (2002, Cat. J/A+A/392/491 (Paper II))
3 = Andrievsky et al. (2002, Cat. J/A+A/381/32 (Paper III))
4 = Luck et al. (2003A&A...401..939L 2003A&A...401..939L (Paper IV))
5 = Andrievsky et al. (2004, Cat. J/A+A/413/159 (Paper V))
6 = Kovtyukh, Wallerstein, & Andrievsky (2005PASP..117.1173K 2005PASP..117.1173K)
7 = Luck, Kovtyukh, & Andrievsky (2006, Cat. J/AJ/132/902 (Paper VI)
8 = This paper
9 = Luck & Andrievsky (2004, Cat. J/AJ/128/343)
10 = Kovtyukh et al. (2005, Cat. J/AJ/129/433)
11 = Luck et al. (2008AJ....136...98L 2008AJ....136...98L)
12 = Andrievsky, Luck, & Kovtyukh (2005, Cat. J/AJ/130/1880)
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History:
From electronic version of the journal
References:
Andrievsky et al., Paper I 2002A&A...384..140A 2002A&A...384..140A
Andrievsky et al., Paper II 2002A&A...392..491A 2002A&A...392..491A, Cat. J/A+A/392/491
Andrievsky et al., Paper III 2002A&A...381...32A 2002A&A...381...32A, Cat. J/A+A/381/32
Luck et al., Paper IV 2003A&A...401..939L 2003A&A...401..939L
Andrievsky et al., Paper V 2004A&A...413..159A 2004A&A...413..159A, Cat. J/A+A/413/159
Luck et al., Paper VI 2006AJ....132..902L 2006AJ....132..902L, Cat. J/AJ/132/902
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 27-Sep-2012