2016A&A...586A.125D


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST22:09:50

2016A&A...586A.125D - Astronomy and Astrophysics, volume 586A, 125-125 (2016/2-1)

Neutron-capture elements across the Galactic thin disk using Cepheids.

DA SILVA R., LEMASLE B., BONO G., GENOVALI K., McWILLIAM A., CRISTALLO S., BERGEMANN M., BUONANNO R., FABRIZIO M., FERRARO I., FRANCOIS P., IANNICOLA G., INNO L., LANEY C.D., KUDRITZKI R.-P., MATSUNAGA N., NONINO M., PRIMAS F., PRZYBILLA N., ROMANIELLO M., THEVENIN F. and URBANEJA M.A.

Abstract (from CDS):

We present new accurate abundances for five neutron-capture elements (Y, La, Ce, Nd, Eu) in 73 classical Cepheids located across the Galactic thin disk. Individual abundances are based on high spectral resolution (R∼38000) and high signal-to-noise ratio (S/N∼50-300) spectra collected with UVES at ESO VLT for the DIONYSOS project. Taking into account similar Cepheid abundances provided by our group (111 stars) and available in the literature, we end up with a sample of 435 Cepheids covering a broad range in iron abundances (-1.6<[Fe/H]<0.6). We found, via homogeneous individual distances and abundance scales, well-defined gradients for the above elements. However, the slope of the light s-process element (Y) is at least a factor of two steeper than the slopes of heavy s- (La, Ce, Nd) and r- (Eu) process elements. The s-to-r abundance ratio ([La/Eu]) of Cepheids shows a well-defined anticorrelation with both Eu and Fe. On the other hand, Galactic field stars attain an almost constant value and display a mild enhancement in La only when they approach solar iron abundance. The [Y/Eu] ratio shows slight evidence of a correlation with Eu and, in particular, with iron abundance for field Galactic stars. We also investigated the s-process index ([hs/ls]) and we found a well-defined anticorrelation, as expected, between [La/Y] and iron abundance. Moreover, we found a strong correlation between [La/Y] and [La/Fe] and, in particular, a clear separation between Galactic and Sagittarius red giants. Finally, the comparison between predictions for low-mass asymptotic giant branch stars and the observed [La/Y] ratio indicate a very good agreement over the entire metallicity range covered by Cepheids. However, the observed spread at fixed iron content is larger than predicted by current models.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: variables: Cepheids - stars: oscillations - open clusters and associations: general - Galaxy: disk

VizieR on-line data: <Available at CDS (J/A+A/586/A125): table2.dat table3.dat table4.dat table7.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* GQ Ori cC* 06 11 13.5830093624 +09 36 44.986218991   9.81 8.88   7.869 B 74 1
2 V* BB Gem cC* 06 34 35.2938235569 +13 04 44.707699381   11.85 11.16     ~ 63 0
3 V* XZ CMa cC* 07 00 24.8328224100 -20 25 54.131989035     13.01     ~ 26 0
4 V* TV CMa cC* 07 09 15.4113468927 -13 47 09.919739837   11.58 10.59     F5 74 0
5 V* HQ Car cC* 10 20 31.9898303153 -61 14 57.414334235   12.50 11.7   11.292 ~ 29 0
6 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 284 0
7 V* KN Cen cC* 13 36 36.8945451169 -64 33 29.916343439   11.22 9.86     G8Iab+B6.0V 128 0
8 V* V340 Ara cC* 16 45 19.1122888146 -51 20 33.394152547   11.39 10.03     ~ 69 0
9 V* KQ Sco cC* 16 51 38.5473466715 -45 25 36.105341336 12.37 10.69 9.31     K7 121 0
10 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12183 0
11 V* V500 Sco cC* 17 48 37.5007852193 -30 28 33.460678490   10.07 8.81   7.191 K0 116 0
12 V* RY Sco cC* 17 50 52.3454231474 -33 42 20.410667234 9.77 8.79 7.51   6.256 F6Ib 172 0
13 V* AV Sgr cC* 18 04 48.7864032131 -22 43 56.645836757   13.39 11.49   10.595 ~ 58 0
14 V* VY Sgr cC* 18 12 04.5660706883 -20 42 14.465377948   12.70 11.36     F6 64 0
15 V* WZ Sgr cC* 18 16 59.7158915244 -19 04 32.989119557   9.10 7.45     F7(III) 233 0
16 V* XX Sgr cC* 18 24 44.5007279272 -16 47 49.819587940   10.51 9.65 9.38   F7/8II 109 0
17 V* UZ Sct cC* 18 31 22.3666774568 -12 55 43.338736715   13.23 10.91   9.195 G0 77 0
18 V* V367 Sct cC* 18 33 35.2353194475 -10 25 38.130057884   13.34 11.580     ~ 156 0
19 V* Z Sct cC* 18 42 57.2739188979 -05 49 15.250916925   10.89 9.60   8.077 G0-M0 114 0
20 Cl* NGC 6715 LSSF 247 * 18 54 48.3460566225 -30 26 38.406324492     16.241     ~ 6 0
21 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1836 2
22 NAME Local Group GrG ~ ~           ~ 7264 0
23 NAME Galactic Bar reg ~ ~           ~ 979 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-22:09:50

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