J/AJ/142/136 Spectroscopy of Cepheids. l=30-250° (Luck+, 2011)
The distribution of the elements in the galactic disk.
III. A reconsideration of Cepheids from l = 30° to 250°.
Luck R.E., Lambert D.L.
<Astron. J., 142, 136 (2011)>
=2011AJ....142..136L 2011AJ....142..136L
ADC_Keywords: Stars, variable; Abundances
Keywords: Galaxy: abundances - Galaxy: evolution - stars: abundances -
stars: variables: Cepheids
Abstract:
This paper reports on the spectroscopic investigation of 238 Cepheids
in the northern sky. Of these stars, about 150 are new to the study of
the galactic abundance gradient. These new Cepheids bring the total
number of Cepheids involved in abundance distribution studies to over
400. In this work, we also consider systematics between various
studies and also those which result from the choice of models.
Description:
High signal-to-noise spectra were obtained in the period 2008
August-November 2010 using the Hobby-Eberly Telescope (HET) and its
high-resolution spectrograph (HRS).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 55 238 Program stars
table2.dat 53 345 Observing log for program stars
table3.dat 94 447 Stellar parameters and abundances
table4.dat 139 339 Average [x/H] ratios for Cepheids
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)
J/A+A/476/73 : Calibration of Cepheid Period/Luminosity relation (Fouque+ 2007)
J/AJ/132/902 : Abundances of 54 Cepheids (Luck+, 2006)
J/AJ/142/51 : Galactic Cepheids abundance variations (Luck+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Cepheid name
15- 20 A6 --- Type Cepheid type (1)
22- 26 F5.2 d Period Period (2)
28- 32 F5.2 mag VMAG Absolute V band magnitude (3)
34- 38 F5.2 mag <Vmag> ? Intensity mean apparent V band magnitude (4)
40- 43 F4.2 mag E(B-V) ? The (B-V) color excess (5)
45- 49 F5.2 kpc Dist ? Distance
51- 55 F5.2 kpc RGal ? Galactic radius (6)
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Note (1): Variability type from the General Catalog of Variable Stars
(Samus, N. N. et al. 2007-2009, Cat. B/gcvs) or Wils & Greaves
(2004IBVS.5512....1W 2004IBVS.5512....1W). Stars from Wils & Greaves are identifiable as they
lack <Vmag> etc.
Note (2): From Berdnikov (2006, private communication to S. Andrievsky),
GCVS (B/gcvs), or Wils & Greaves (2004IBVS.5512....1W 2004IBVS.5512....1W).
Note (3): Computed assuming listed period is the fundamental except for DCEPS
where P0=P/0.71. 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 (1995IBVS.4148....1F 1995IBVS.4148....1F). Exceptions are CK Cam and V411 Lac
from van Leeuven et al. (2007MNRAS.379..723V 2007MNRAS.379..723V) and LO Cam from Garcia-Melendo
(2001Ap&SS.275..479G 2001Ap&SS.275..479G).
Note (5): From Fouque et al. (2007, Cat. J/A+A/476/73) or Fernie
(1995IBVS.4148....1F 1995IBVS.4148....1F) as modified by Fouque et al.
Exceptions are:
* BC Aql and BW Gem - Diethelm (1990A&A...239..186D 1990A&A...239..186D);
* EV Aql, KL Aql, and V1344 Aql - Fernie (1990ApJS...72..153F 1990ApJS...72..153F);
* AS Aur, GT Aur, GM Cas, HK Cas, FT Mon, DF Ori, and DV Ser - computed using
the method of Kovtyukh et al (2008MNRAS.389.1336K 2008MNRAS.389.1336K);
* DR Cep, EX Cyg, GL Cyg, EK Del, BB Gem, BB Her, and AU Peg - Harris
(1985AJ.....90..756H 1985AJ.....90..756H);
* CK Cam and V411 Lac - van Leeuven et al. (2007MNRAS.379..723V 2007MNRAS.379..723V);
* LO Cam - Garcia-Melendo (2001Ap&SS.275..479G 2001Ap&SS.275..479G).
Note (6): The Sun is assumed to be 7.9kpc from the galactic center
(McNamara et al. 2000PASP..112..202M 2000PASP..112..202M).
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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- 13 A13 --- Name Cepheid name
15 A1 --- Tel [HM] Telescope code (1)
17- 20 I4 yr Obs.Y UT Year of the observation
22- 23 I2 month Obs.M UT month of the observation
25- 26 I2 d Obs.D UT Day of the observation
28- 29 I2 h Obs.h UT hour of the observation
31- 32 I2 min Obs.m UT minute of the observation
34- 38 F5.2 s Obs.s UT second of the observation
40- 43 I4 s Exp Exposure time
45- 47 I3 --- S/N Signal-to-Noise ratio (2)
49- 53 F5.3 --- Phase ? Phase during observation (3)
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Note (1): Telescope code as follows:
H = Hobby-Eberly Telescope
M = McDonald Observatory 2.7m
Note (2): per pixel, near 600nm at order center.
Note (3): Periods and epochs from Berdnikov (2006- private communication to
S. Andrievsky) , GCVS (B/gcvs), or Wils & Greaves (2004IBVS.5512....1W 2004IBVS.5512....1W).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Cepheid name
14 A1 --- --- [#]
15 I1 --- m_Name [1/2]? Multiple results
17- 21 F5.3 --- Phase ? Phase during observation (1)
23- 26 I4 K Teff Effective temperature (2)
28- 30 I3 K e_Teff Standard deviation of Teff
32- 33 I2 --- o_Teff Number of ratios utilized to determine Teff
35- 38 F4.2 [cm/s2] logg Log of the surface gravity
40- 43 F4.2 km/s Vturb Microturbulent velocity ξ
45- 48 F4.1 km/s Vmacro Macroturbulent velocity
50- 53 F4.2 [-] [Fe/H]1 The [Fe/H] determined from the FeI lines
55- 58 F4.2 [-] e_[Fe/H]1 Standard deviation of [Fe/H]I
60- 62 I3 --- o_[Fe/H]1 Number of lines utilized to determine [Fe/H]I
64- 67 F4.2 [-] [Fe/H]2 The [Fe/H] determined from the FeII lines
69- 72 F4.2 [-] e_[Fe/H]2 Standard deviation of [Fe/H]II
74- 75 I2 --- o_[Fe/H]2 Number of lines utilized to determine [Fe/H]II
77- 79 F3.1 [-] Li Upper limit for the lithium abundance (3)
81- 84 F4.2 [-] C The carbon abundance (4)
86- 89 F4.2 [-] N ? The nitrogen abundance (5)
91- 94 F4.2 [-] O The oxygen abundance (6)
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Note (1): 0.0 is maximum light.
Note (2): Determined using the line ratio method of Kovtyukh
(2007MNRAS.378..617K 2007MNRAS.378..617K).
Note (3): Except for V1033 Cyg which is a determined value.
Note (4): From a combination of CI lines.
Note (5): From NI lines at 744 and 768nm.
Note (6): From a combination of OI lines at 616nm and the [OI] line at 630nm.
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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- 13 A13 --- Name Cepheid name
15- 19 F5.2 [Sun] [C/H] Log of C/H number abundance
21- 25 F5.2 [Sun] [N/H] ? Log of N/H number abundance
27- 31 F5.2 [Sun] [O/H] Log of O/H number abundance
33- 37 F5.2 [Sun] [Na/H] ? Log of Na/H number abundance
39- 43 F5.2 [Sun] [Mg/H] ? Log of Mg/H number abundance
45- 49 F5.2 [Sun] [Al/H] Log of Al/H number abundance
51- 55 F5.2 [Sun] [Si/H] Log of Si/H number abundance
57- 61 F5.2 [Sun] [Ca/H] Log of Ca/H number abundance
63- 67 F5.2 [Sun] [Ti/H] Log of Ti/H number abundance
69- 73 F5.2 [Sun] [Cr/H] Log of Cr/H number abundance
75- 79 F5.2 [Sun] [Mn/H] Log of Mn/H number abundance
81- 85 F5.2 [Sun] [Fe/H] Log of Fe/H number abundance
87- 91 F5.2 [Sun] [Co/H] Log of Co/H number abundance
93- 97 F5.2 [Sun] [Ni/H] Log of Ni/H number abundance
99-103 F5.2 [Sun] [Y/H] Log of Y/H number abundance
105-109 F5.2 [Sun] [La/H] ? Log of La/H number abundance
111-115 F5.2 [Sun] [Ce/H] Log of Ce/H number abundance
117-121 F5.2 [Sun] [Pr/H] ? Log of Pr/H number abundance
123-127 F5.2 [Sun] [Nd/H] Log of Nd/H number abundance
129-133 F5.2 [Sun] [Sm/H] ? Log of Sm/H number abundance
135-139 F5.2 [Sun] [Eu/H] ? Log of Eu/H number abundance
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History:
From electronic version of the journal
References:
Luck et al., Paper I 2006AJ....132..902L 2006AJ....132..902L Cat. J/AJ/132/902
Luck et al., Paper II 2011AJ....142...51L 2011AJ....142...51L Cat. J/AJ/142/51
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 18-Jan-2013