J/MNRAS/422/3527 Equivalent widths of 11 NGC 3680 stars (Mitschang+, 2012)
Elemental abundances of intermediate-age open cluster NGC 3680.
Mitschang A.W., De Silva G.M., Zucker D.B.
<Mon. Not. R. Astron. Soc., 422, 3527-3534 (2012)>
=2012MNRAS.422.3527M 2012MNRAS.422.3527M
ADC_Keywords: Clusters, open ; Equivalent widths
Keywords: stars: abundances - open clusters and associations: general -
open clusters and associations: individual: NGC 3680
Abstract:
We present a new abundance analysis of the intermediate-age Galactic
open cluster NGC 3680, based on high-resolution, high signal-to-noise
ratio VLT/UVES spectroscopic data. Several element abundances are
presented for this cluster for the first time, but most notably we
derive abundances for the light and heavy s-process elements Y, Ba, La
and Nd. The serendipitous measurement of the rare-earth r-process
element Gd is also reported. This cluster exhibits a significant
enhancement of Na in giants as compared to dwarfs, which may be a
proxy for an O to Na anticorrelation as observed in Galactic globular
clusters but not open clusters. We also observe a step-like
enhancement of heavy s-process elements towards higher atomic number,
contrary to expectations from asymptotic giant branch nucleosynthesis
models, suggesting that the r process played a significant role in the
generation of both La and Nd in this cluster.
Description:
Observations were carried out using the Fibre Large Array Multi
Element Spectrograph (FLAMES) multi-object fibre system feeding the
Ultraviolet and Visual Echelle Spectrograph (UVES; R∼45000) at the
Very Large Telescope (VLT) as a part of service programme 072.B-0331B
over nine nights in 2004.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 45 11 Target star data
table2.dat 101 244 Equivalent widths for programme stars
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq Sequential number <Cl* NGC 3680 NAA NN> in Simbad
4- 5 I2 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 13 F4.1 s RAs Right ascension (J2000)
15 A1 --- DE- Declination sign (J2000)
16- 17 I2 deg DEd Declination (J2000)
19- 20 I2 arcmin DEm Declination (J2000)
22- 25 F4.1 arcsec DEs Declination (J2000)
27- 31 F5.2 mag Vmag V magnitude
33- 36 I4 K Teff Effective temperature
38- 40 F3.1 [cm/s2] logg Surface gravity
42- 45 F4.2 km/s ksi Microturbulent velocity ξ
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 0.1nm lambda Wavelength
9- 13 A5 --- Ion Ion
15- 18 F4.2 eV EP Excitation potential
20- 24 F5.2 [-] loggf Oscillator strength
26- 31 F6.2 0.1pm EW11 Equivalent width for star#11
33- 38 F6.2 0.1pm EW13 ? Equivalent width for star#13
40- 45 F6.2 0.1pm EW20 ? Equivalent width for star#20
47- 52 F6.2 0.1pm EW26 ? Equivalent width for star#26
54- 59 F6.2 0.1pm EW27 ? Equivalent width for star#27
61- 66 F6.2 0.1pm EW34 ? Equivalent width for star#34
68- 73 F6.2 0.1pm EW41 ? Equivalent width for star#41
75- 80 F6.2 0.1pm EW44 ? Equivalent width for star#44
82- 87 F6.2 0.1pm EW24 ? Equivalent width for star#11
89- 94 F6.2 0.1pm EW35 ? Equivalent width for star#35
96-101 F6.2 0.1pm EW5 ? Equivalent width for star#5
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Jan-2013