J/ApJS/197/29 Chemical compositions of 11 RR Lyrae (For+, 2011)
The chemical compositions of variable field horizontal-branch stars:
RR Lyrae stars.
For B.-Q., Sneden C., Preston G.W.
<Astrophys. J. Suppl. Ser., 197, 29 (2011)>
=2011ApJS..197...29F 2011ApJS..197...29F
ADC_Keywords: Abundances ; Stars, variable ; Stars, horizontal branch ;
Spectroscopy
Keywords: stars: abundances - stars: horizontal-branch - stars: Population II -
stars: variables: RR Lyrae
Abstract:
We present a detailed abundance study of 11 RR Lyrae ab-type
variables: AS Vir, BS Aps, CD Vel, DT Hya, RV Oct, TY Gru, UV Oct,
V1645 Sgr, WY Ant, XZ Aps, and Z Mic. High-resolution and high
signal-to-noise ratio echelle spectra of these variables were obtained
with the 2.5m du Pont telescope at the Las Campanas Observatory. We
obtained more than 2300 spectra, roughly 200 spectra per star,
distributed more or less uniformly throughout the pulsational cycles.
A new method has been developed to obtain the initial effective
temperatures of our sample stars at a specific pulsational phase. We
find that the abundance ratios are generally consistent with those of
similar metallicity field stars in different evolutionary states and
throughout the pulsational cycles for RR Lyrae stars. TY Gru remains
the only n-capture enriched star among the RRab in our sample.
Description:
The spectroscopic data were obtained with the du Pont 2.5m telescope
at the Las Campanas Observatory (LCO), using a cross-dispersed echelle
spectrograph with a total wavelength coverage of 3500-9000Å. See
Section 3 of For et al. 2011, Cat. J/ApJS/194/38, for details of data
reduction.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 104 15 Basic information for the program stars
table7.dat 101 165 Abundance ratios of Na, Mg, Al, Si and Ca
throughout the pulsational cycles
table8.dat 89 165 Abundance ratios of Sc, Ti, V, and Cr throughout
the pulsational cycles
table9.dat 64 165 Abundance ratios of Co, Ni, Zn, Y throughout the
pulsational cycles
--------------------------------------------------------------------------------
See also:
III/176 : RR Lyrae Metallicities (Layden 1994)
J/ApJS/194/38 : Radial velocities of 11 field RR Lyrae (For+, 2011)
J/AcA/59/137 : ASAS Galactic fundamental mode RR Lyrae stars (Szczygiel+,
2009)
J/AJ/136/1645 : Spectroscopy of bright QUEST RR Lyrae stars (Vivas+, 2008)
J/AJ/132/1714 : Photometric and Spectroscopic study of TY Gru (Preston+, 2006)
J/A+A/312/111 : [Fe/H] from RR Lyrae light curves (Jurcsik+, 1996)
J/AJ/110/2319 : Abundances in RR Lyr variables (Clementini+ 1995)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Star name
11- 12 I2 h RAh Hour of right ascension (J2000)
14- 15 I2 min RAm Minute of right ascension (J2000)
17- 21 F5.2 s RAs Second of right ascension (J2000)
23 A1 --- DE- Sign of declination (J2000)
24- 25 I2 deg DEd Degree of declination (J2000)
27- 28 I2 arcmin DEm Arcminute of declination (J2000)
30- 33 F4.1 arcsec DEs Arcsecond of declination (J2000)
35- 66 A32 --- Data Data used (HJD 2450000+) (1)
68- 75 F8.3 d T0 Epoch (HJD 2450000+)
77- 82 F6.4 d e_T0 T0 uncertainty (HJD 2450000+)
84- 91 F8.6 d Per ? Pulsation period
93-100 F8.6 d e_Per ? Period uncertainty
102-104 I3 --- N ? Total number of observed spectra
--------------------------------------------------------------------------------
Note (1): Data with the corresponding HJDs were used to derive the T0.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Star name
11 I1 --- Cycle [1,3]? Cycle number
13- 17 F5.3 --- Phase Phase
19- 23 F5.2 [Sun] [NaI/Fe] ? Log Na I/Fe abundance ratio
25 A1 --- f_[NaI/Fe] [a] Indicates a NLTE correction in [NaI/Fe]
27- 30 F4.2 [Sun] e_[NaI/Fe] ? The 1σ uncertainty in [NaI/Fe]
32 I1 --- o_[NaI/Fe] ? Number of lines used in [NaI/Fe]
34- 37 F4.2 [Sun] [MgI/Fe] ? Log Mg I/Fe abundance ratio
39- 42 F4.2 [Sun] e_[MgI/Fe] ? The 1σ uncertainty in [MgI/Fe]
44 I1 --- o_[MgI/Fe] ? Number of lines used in [MgI/Fe]
46- 50 F5.2 [Sun] [AlI/Fe] ? Log Al I/Fe abundance ratio
52 A1 --- f_[AlI/Fe] [a] Indicates a NLTE correction in [AlI/Fe]
54- 57 F4.2 [Sun] e_[AlI/Fe] ? The 1σ uncertainty in [AlI/Fe]
59 I1 --- o_[AlI/Fe] ? Number of lines used in [AlI/Fe]
61- 65 F5.2 [Sun] [SiI/Fe] ? Log Si I/Fe abundance ratio
67 A1 --- f_[SiI/Fe] [a] Indicates a NLTE correction in [SiI/Fe]
69- 72 F4.2 [Sun] e_[SiI/Fe] ? The 1σ uncertainty in [SiI/Fe]
74 I1 --- o_[SiI/Fe] ? Number of lines used in [SiI/Fe]
76- 79 F4.2 [Sun] [SiII/Fe] ? Log Si II/Fe abundance ratio
81 A1 --- f_[SiII/Fe] [a] Indicates a NLTE correction in [SiII/Fe]
83- 86 F4.2 [Sun] e_[SiII/Fe] ? The 1σ uncertainty in [SiII/Fe]
88 I1 --- o_[SiII/Fe] ? Number of lines used in [SiII/Fe]
90- 93 F4.2 [Sun] [CaI/Fe] ? Log Ca I/Fe abundance ratio
95- 98 F4.2 [Sun] e_[CaI/Fe] ? The 1σ uncertainty in [CaI/Fe]
100-101 I2 --- o_[CaI/Fe] ? Number of lines used in [CaI/Fe]
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Star name
11 I1 --- Cycle [1,3]? Cycle number
13- 17 F5.3 --- Phase Phase
19- 23 F5.2 [Sun] [ScII/Fe] ? Log Sc II/Fe abundance ratio
25- 28 F4.2 [Sun] e_[ScII/Fe] ? The 1σ uncertainty in [ScII/Fe]
30 I1 --- o_[ScII/Fe] ? Number of lines used in [ScII/Fe]
32- 35 F4.2 [Sun] [TiI/Fe] ? Log Ti I/Fe abundance ratio
37- 40 F4.2 [Sun] e_[TiI/Fe] ? The 1σ uncertainty in [TiI/Fe]
42- 43 I2 --- o_[TiI/Fe] ? Number of lines used in [TiI/Fe]
45- 48 F4.2 [Sun] [TiII/Fe] ? Log Ti II/Fe abundance ratio
50- 53 F4.2 [Sun] e_[TiII/Fe] ? The 1σ uncertainty in [TiII/Fe]
55- 56 I2 --- o_[TiII/Fe] ? Number of lines used in [TiII/Fe]
58- 61 F4.2 [Sun] [VII/Fe] ? Log V II/Fe abundance ratio
63 I1 --- o_[VII/Fe] ? Number of lines used in [VII/Fe]
65- 69 F5.2 [Sun] [CrI/Fe] ? Log Cr I/Fe abundance ratio
71- 74 F4.2 [Sun] e_[CrI/Fe] ? The 1σ uncertainty in [CrI/Fe]
76 I1 --- o_[CrI/Fe] ? Number of lines used in [CrI/Fe]
78- 82 F5.2 [Sun] [CrII/Fe] ? Log Cr II/Fe abundance ratio
84- 87 F4.2 [Sun] e_[CrII/Fe] ? The 1σ uncertainty in [CrII/Fe]
89 I1 --- o_[CrII/Fe] ? Number of lines used in [CrII/Fe]
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Star name
11 I1 --- Cycle [1,3]? Cycle number
13- 17 F5.3 --- Phase Phase
19- 23 F5.2 [Sun] [CoI/Fe] ? Log Na I/Fe abundance ratio
25 I1 --- o_[CoI/Fe] ? Number of lines used in [CoI/Fe]
27- 31 F5.2 [Sun] [NiI/Fe] ? Log Ni I/Fe abundance ratio
33- 36 F4.2 [Sun] e_[NiI/Fe] ? The 1σ uncertainty in [NiI/Fe]
38 I1 --- o_[NiI/Fe] ? Number of lines used in [NiI/Fe]
40- 44 F5.2 [Sun] [ZnI/Fe] ? Log Zn I/Fe abundance ratio
46- 49 F4.2 [Sun] e_[ZnI/Fe] ? The 1σ uncertainty in [ZnI/Fe]
51 I1 --- o_[ZnI/Fe] ? Number of lines used in [ZnI/Fe]
53- 57 F5.2 [Sun] [YII/Fe] ? Log Y II/Fe abundance ratio
59- 62 F4.2 [Sun] e_[YII/Fe] ? The 1σ uncertainty in [YII/Fe]
64 I1 --- o_[YII/Fe] ? Number of lines used in [YII/Fe]
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Jan-2012