J/AJ/148/83 Spectroscopy in NGC 2360, NGC 3680, and NGC 5822 (Sales+, 2014)
High-resolution spectroscopic observations of binary stars and yellow stragglers
in three open clusters : NGC 2360, NGC 3680, and NGC 5822.
Sales Silva J.V., Pena Suarez V.J., Katime Santrich O.J., Pereira C.B.,
Drake N.A., Roig F.
<Astron. J., 148, 83 (2014)>
=2014AJ....148...83S 2014AJ....148...83S
ADC_Keywords: Clusters, open ; Stars, double and multiple ; Equivalent widths ;
Radial velocities
Keywords:
open clusters and associations: individual: (NGC 2360,NGC 3680,NGC 5822) -
stars: abundances - stars: fundamental parameters -
stars: individual: (CD-42 6974,CD-42 6971,CD-42 6978,CD-42 6976,CPD-53 6230,
CPD-53 6231,CPD-53 6232,CPD-53 6255,CPD-54 6305)
Abstract:
Binary stars in open clusters are very useful targets in constraining
the nucleosynthesis process. The luminosities of the stars are known
because the distances of the clusters are also known, so chemical
peculiarities can be linked directly to the evolutionary status of a
star. In addition, binary stars offer the opportunity to verify a
relationship between them and the straggler population in both
globular and open clusters. We carried out a detailed spectroscopic
analysis to derive the atmospheric parameters for 16 red giants in
binary systems and the chemical composition of 11 of them in the open
clusters NGC 2360, NGC 3680, and NGC 5822. We obtained abundances of
C, N, O, Na, Mg, Al, Ca, Si, Ti, Ni, Cr, Y, Zr, La, Ce, and Nd. The
atmospheric parameters of the studied stars and their chemical
abundances were determined using high-resolution optical spectroscopy.
We employ the local thermodynamic equilibrium model atmospheres of
Kurucz and the spectral analysis code MOOG. The abundances of the
light elements were derived using the spectral synthesis technique. We
found that the stars NGC 2360-92 and 96, NGC 3680-34, and NGC 5822-4
and 312 are yellow straggler stars. We show that the spectra of NGC
5822-4 and 312 present evidence of contamination by an A-type star as
a secondary star. For the other yellow stragglers, evidence of
contamination is given by the broad wings of the Hα. Detection
of yellow straggler stars is important because the observed number can
be compared with the number predicted by simulations of binary stellar
evolution in open clusters. We also found that the other binary stars
are not s-process enriched, which may suggest that in these binaries
the secondary star is probably a faint main-sequence object. The lack
of any s-process enrichment is very useful in setting constraints for
the number of white dwarfs in the open cluster, a subject that is
related to the birthrate of these kinds of stars in open clusters and
also to the age of a cluster. Finally, rotational velocities were also
determined and their values were compared with those already
determined for field giant stars.
Description:
High-resolution spectra of the binary and candidate binary stars of
the open clusters NGC 2360, NGC 3680, and NGC 5822 were obtained with
Fiberfed Extended Range Optical Spectrograph (FEROS) on the 2.2m ESO
telescope of La Silla (Chile). Table1 gives the log of the
observations and other information on the observed stars. The stars
were selected from the radial velocity survey of Mermilliod et al.
2008 (cat. J/A+A/485/303). The wavelength range obtained with FEROS
covers the spectral region between 3800Å and 9200Å with a
resolving power of R=48000. The detector was a 2k*4k CCD.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 16 Log of the observations and relevant information
for the target stars of open clusters NGC 2360,
NGC 3680, and NGC 5822
table2.dat 43 131 Observed FeI and FeII lines
table3.dat 39 103 Observed FeI and FeII lines
table4.dat 51 117 Observed FeI and FeII lines
table7.dat 53 209 Other lines studied: NGC 2360 and NGC 3680
table8.dat 49 206 Other lines studied: NGC 5822
ew.dat 93 436 All equivalent widths (file added at CDS)
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See also:
I/212 : Proper motions in NGC 3680 (Kozhurina-Platais+, 1995)
J/AJ/146/39 : Spectroscopy of NGC 5822-2 and NGC 5822-201 (Katime+, 2013)
J/MNRAS/422/3527 : Equivalent widths of 11 NGC 3680 stars (Mitschang+, 2012)
J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)
J/A+A/535/A30 : Chemical abundance of stars in open clusters
(Carrera+, 2011)
J/A+A/515/A28 : Abundances of dwarfs and giants in 2 open clusters
(Pace+, 2010)
J/AJ/139/1942 : Equivalent widths of red giants in open clusters
(Friel+, 2010)
J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)
J/A+A/502/267 : EWs of 31 giant stars of 10 open clusters (Smiljanic+, 2009)
J/A+A/485/303 : Radial velocities for 1309 stars & 166 OCl
(Mermilliod+, 2008)
J/A+A/473/829 : Orbital elements of 156 spectroscopic binaries
(Mermilliod+, 2007)
J/A+A/360/509 : Chemical abundances in 7 red giants (Hamdani+, 2000)
J/A+A/319/481 : Radial velocities of 10 spectroscopic binaries
(Mermilliod+ 1997)
J/A+AS/118/407 : CCD photometry & velocities of NGC 3680 stars
(Nordstroem+ 1996)
J/A+A/299/53 : Red giants in NGC 3680 and IC 4651 (Mermilliod+, 1995)
J/PASP/105/78 : Photometry in open cluster NGC 5822 (Twarog+, 1993)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [NGC]
5- 8 I4 --- NGC NGC identification of the open cluster
10- 12 I3 --- Star Star number within the open cluster
14- 28 A15 --- CD/CPD CD or CPD number (when available) of the star
30- 34 F5.2 mag Vmag The V-band magnitude
36- 39 F4.2 mag B-V The B-V color index
41- 46 F6.2 km/s RV1 Radial velocity from Mermilliod et al. 2008
(J/A+A/485/303)
48- 52 F5.2 km/s e_RV1 Error in RV1
54- 59 F6.2 km/s RV2 Our value of the radial velocity
61- 64 F4.2 km/s e_RV2 Error in RV2
66- 76 A11 "Y:M:D" Date Date of observation
78- 86 F9.3 d MJD Julian Date of observation (JD-2400000)
88- 91 I4 s Exp Exposure time
93- 95 A3 --- Tbl Table(s) with spectroscopic data (column added
at CDS)
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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- 4 A4 --- Ion Iron line identifier (FeI or FeII)
6- 12 F7.2 0.1nm lambda Wavelength λ
14- 17 F4.2 eV LEP Lower Excitation Potential χ
19- 23 F5.2 --- loggf Oscillator strength (G1)
25- 27 I3 0.1pm EW51 ? Equivalent width of NGC 2360-51 (in mÅ)
29- 31 I3 0.1pm EW52 ? Equivalent width of NGC 2360-52 (in mÅ)
33- 35 I3 0.1pm EW62 ? Equivalent width of NGC 2360-62 (in mÅ)
37- 39 I3 0.1pm EW92 ? Equivalent width of NGC 2360-92 (in mÅ)
41- 43 I3 0.1pm EW96 ? Equivalent width of NGC 2360-96 (in mÅ)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Ion Iron line identifier (FeI or FeII)
6- 12 F7.2 0.1nm lambda Wavelength λ
14- 17 F4.2 eV LEP Lower Excitation Potential χ
19- 23 F5.2 --- loggf Oscillator strength (G1)
25- 27 I3 0.1pm EW11 ? Equivalent width of NGC 3680-11 (in mÅ)
29- 31 I3 0.1pm EW20 ? Equivalent width of NGC 3680-20 (in mÅ)
33- 35 I3 0.1pm EW27 ? Equivalent width of NGC 3680-27 (in mÅ)
37- 39 I3 0.1pm EW34 ? Equivalent width of NGC 3680-34 (in mÅ)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Ion Iron line identifier (FeI or FeII)
6- 12 F7.2 0.1nm lambda Wavelength λ
14- 17 F4.2 eV LEP Lower Excitation Potential χ
19- 23 F5.2 --- loggf Oscillator strength (G1)
25- 27 I3 0.1pm EW3 ? Equivalent width of NGC 5822-3 (in mÅ)
29- 31 I3 0.1pm EW4 ? Equivalent width of NGC 5822-4 (in mÅ)
33- 35 I3 0.1pm EW11 ? Equivalent width of NGC 5822-11 (in mÅ)
37- 39 I3 0.1pm EW51 ? Equivalent width of NGC 5822-51 (in mÅ)
41- 43 I3 0.1pm EW80 ? Equivalent width of NGC 5822-80 (in mÅ)
45- 47 I3 0.1pm EW151 ? Equivalent width of NGC 5822-151 (in mÅ)
49- 51 I3 0.1pm EW312 ? Equivalent width of NGC 5822-312 (in mÅ)
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Ion Line identifier (G2)
6- 12 F7.2 0.1nm lambda Wavelength λ
14- 17 F4.2 eV LEP Lower Excitation Potential χ
19- 23 F5.2 --- loggf Oscillator strength
25- 29 A5 --- r_loggf Reference for loggf (G3)
31- 33 I3 0.1pm EW51 ? Equivalent width of NGC 2360-51 (in mÅ)
35- 37 I3 0.1pm EW52 ? Equivalent width of NGC 2360-52 (in mÅ)
39- 41 I3 0.1pm EW62 ? Equivalent width of NGC 2360-62 (in mÅ)
43- 45 I3 0.1pm EW11 ? Equivalent width of NGC 3680-11 (in mÅ)
47- 49 I3 0.1pm EW20 ? Equivalent width of NGC 3680-20 (in mÅ)
51- 53 I3 0.1pm EW27 ? Equivalent width of NGC 3680-27 (in mÅ)
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Ion Line identifier (G2)
6- 12 F7.2 0.1nm lambda Wavelength λ
14- 17 F4.2 eV LEP Lower Excitation Potential χ
19- 23 F5.2 --- loggf Oscillator strength
25- 29 A5 --- r_loggf Reference for loggf (G3)
31- 33 I3 0.1pm EW3 ? Equivalent width of NGC 5822-3 (in mÅ)
35- 37 I3 0.1pm EW11 ? Equivalent width of NGC 5822-11 (in mÅ)
39- 41 I3 0.1pm EW51 ? Equivalent width of NGC 5822-51 (in mÅ)
43- 45 I3 0.1pm EW80 ? Equivalent width of NGC 5822-80 (in mÅ)
47- 49 I3 0.1pm EW151 ? Equivalent width of NGC 5822-151 (in mÅ)
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Byte-by-byte Description of file: ew.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Ion Line identifier (G2)
6- 12 F7.2 0.1nm lambda Wavelength λ
14- 17 F4.2 eV LEP Lower Excitation Potential χ
19- 23 F5.2 --- loggf Oscillator strength
25- 29 A5 --- r_loggf Reference for loggf (G3)
31- 33 I3 0.1pm EW1 ? Equivalent width for NGC 2360-51
35- 37 I3 0.1pm EW2 ? Equivalent width for NGC 2360-52
39- 41 I3 0.1pm EW3 ? Equivalent width for NGC 2360-62
43- 45 I3 0.1pm EW4 ? Equivalent width for NGC 2360-92
47- 49 I3 0.1pm EW5 ? Equivalent width for NGC 2360-96
51- 53 I3 0.1pm EW6 ? Equivalent width for NGC 3680-11
55- 57 I3 0.1pm EW7 ? Equivalent width for NGC 3680-20
59- 61 I3 0.1pm EW8 ? Equivalent width for NGC 3680-27
63- 65 I3 0.1pm EW9 ? Equivalent width for NGC 3680-34
67- 69 I3 0.1pm EW10 ? Equivalent width for NGC 5822-3
71- 73 I3 0.1pm EW11 ? Equivalent width for NGC 5822-4
75- 77 I3 0.1pm EW12 ? Equivalent width for NGC 5822-11
79- 81 I3 0.1pm EW13 ? Equivalent width for NGC 5822-51
83- 85 I3 0.1pm EW14 ? Equivalent width for NGC 5822-80
87- 89 I3 0.1pm EW15 ? Equivalent width for NGC 5822-151
91- 93 I3 0.1pm EW16 ? Equivalent width for NGC 5822-312
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Global notes:
Note (G1): Taken from Lambert et al. (1996ApJS..103..183L 1996ApJS..103..183L) and Castro et al.
(1997AJ....114..376C 1997AJ....114..376C).
Note (G2): AlI, CaI, CeII, CrI, LaII, MgI, NaI, NdII, NiI, SiI, TiI, YII, ZrI.
Note (G3): Reference defined as follows:
A05 = Antipova et al. 2005 (cat. J/AZh/82/601);
B86 = Blackwell et al. (1986MNRAS.220..289B 1986MNRAS.220..289B);
Ca07 = Carretta et al. (2007A&A...473..129C 2007A&A...473..129C);
D2002 = Depagne et al. (2002A&A...390..187D 2002A&A...390..187D);
DH = Den Hartog et al. (2003ApJS..148..543D 2003ApJS..148..543D);
DS91 = Drake & Smith (1991MNRAS.250...89D 1991MNRAS.250...89D);
E93 = Edvardsson et al. 1993 (cat. J/A+A/275/101);
GS = Gratton & Sneden (1988A&A...204..193G 1988A&A...204..193G);
LC = Lambert et al. (1996ApJS..103..183L 1996ApJS..103..183L) and
Castro et al. (1997AJ....114..376C 1997AJ....114..376C)
MFK = Martin et al. (2002, NIST Atomic Spectra Database, Gaithersburg,
MD: NIST, Version 2.0);
MR94 = McWilliam & Rich (1994ApJS...91..749M 1994ApJS...91..749M);
PS = Preston & Sneden (2001AJ....122.1545P 2001AJ....122.1545P);
R03 = Reddy et al. 2003 (cat. J/MNRAS/340/304);
R04 = Reyniers et al. 2004 (cat. J/A+A/417/269);
R99 = Reddy et al. (1999ApJ...524..831R 1999ApJ...524..831R);
S86 = Smith et al. (1986A&A...165..126S 1986A&A...165..126S);
S96 = Smith et al. (1996A&A...315..179S 1996A&A...315..179S);
SN96 = Sneden et al. (1996ApJ...467..819S 1996ApJ...467..819S);
VWR = Van Wickel & Reyners (2000A&A...354..135V 2000A&A...354..135V);
WSM = Wiese et al. (1969atp..book.....W 1969atp..book.....W).
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 03-Dec-2014