2014A&A...572A..88L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST14:54:07

2014A&A...572A..88L - Astronomy and Astrophysics, volume 572A, 88-88 (2014/12-1)

VLT/FLAMES spectroscopy of red giant branch stars in the Fornax dwarf spheroidal galaxy.

LEMASLE B., DE BOER T.J.L., HILL V., TOLSTOY E., IRWIN M.J., JABLONKA P., VENN K., BATTAGLIA G., STARKENBURG E., SHETRONE M., LETARTE B., FRANCOIS P., HELMI A., PRIMAS F., KAUFER A. and SZEIFERT T.

Abstract (from CDS):

Fornax is one of the most massive dwarf spheroidal galaxies in the Local Group. The Fornax field star population is dominated by intermediate age stars but star formation was going on over almost its entire history. It has been proposed that Fornax experienced a minor merger event. Despite recent progress, only the high metallicity end of Fornax field stars ([Fe/H]>-1.2dex) has been sampled in larger number via high resolution spectroscopy. We want to better understand the full chemical evolution of this galaxy by better sampling the whole metallicity range, including more metal poor stars. We use the VLT-FLAMES multi-fibre spectrograph in high-resolution mode to determine the abundances of several α, iron-peak and neutron-capture elements in a sample of 47 individual red giant branch stars in the Fornax dwarf spheroidal galaxy. We combine these abundances with accurate age estimates derived from the age probability distribution from the colour-magnitude diagram of Fornax. Similar to other dwarf spheroidal galaxies, the old, metal-poor stars of Fornax are typically α-rich while the young metal-rich stars are α-poor. In the classical scenario of the time delay between Type II (SNe II) and Type Ia Supernovae (SNe Ia), we confirm that SNe Ia started to contribute to the chemical enrichment at [Fe/H] between -2.0 and -1.8dex. We find that the onset of SNe Ia took place between 12-10Gyr ago. The high values of [Ba/Fe], [La/Fe] reflect the influence of SNe Ia and AGB stars in the abundance pattern of the younger stellar population of Fornax. Our findings of low [α/Fe] and enhanced [Eu/Mg] are compatible with an initial mass function that lacks the most massive stars and with star formation that kept going on throughout the whole history of Fornax. We find that massive stars kept enriching the interstellar medium in α-elements, although they were not the main contributor to the iron enrichment.

Abstract Copyright:

Journal keyword(s): stars: abundances - galaxies: individual: Fornax - galaxies: evolution

VizieR on-line data: <Available at CDS (J/A+A/572/A88): tablea3.dat table7.dat table3.dat tablea5.dat>

Nomenclature: Table A.3: [LDH2014] Fnx-memNNNN N=45 among (Nos 0514-0779), [LDH2014] Fnx-rgbNNNN N=13 among (Nos 0507-0614).

CDS comments: Star ET228 not identified.

Simbad objects: 65

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Number of rows : 65

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1116 4
2 [LDH2014] Fnx-mem0629 * 02 37 20.2055314045 -34 46 46.018034065   20.200 18.59   17.11 ~ 3 0
3 [LDH2014] Fnx-mem0738 * 02 37 22.0696104088 -34 55 20.885215197   19.834 18.490   16.901 ~ 1 0
4 [LDH2014] Fnx-mem0654 * 02 37 22.5409522058 -34 49 04.565789256   19.949 18.67   17.29 ~ 2 0
5 [WMO2009] For-1353 * 02 37 23.667 -34 43 21.01   19.832 18.56   17.28 ~ 2 0
6 [LDH2014] Fnx-mem0647 * 02 37 24.2654940133 -34 48 37.350709510   20.007 18.54   17.13 ~ 2 0
7 [LDH2014] Fnx-mem0528 * 02 37 32.4705453432 -34 39 53.523734245   19.743 18.43   16.94 ~ 3 0
8 [LDH2014] Fnx-mem0539 * 02 37 32.8752786630 -34 40 42.023570994   20.096 18.54   17.02 ~ 2 0
9 [LDH2014] Fnx-mem0747 * 02 37 34.4961418031 -34 56 08.810464095   20.120 18.61   17.25 ~ 3 0
10 [LDH2014] Fnx-mem0779 * 02 37 42.5459687007 -34 58 30.391675963   19.777 18.3   17.04 ~ 2 0
11 [KHI2013] III-84 * 02 37 44.4935709942 -34 45 58.912913975   19.741 18.607   17.293 ~ 2 0
12 [LDH2014] Fnx-rgb0614 RG* 02 37 47.300 -34 54 30.50   19.841 18.448   16.592 ~ 1 0
13 [LDH2014] Fnx-mem0732 * 02 37 47.4841942524 -34 54 52.704105490   19.943 18.25   16.89 ~ 2 0
14 2MASS J02374841-3436219 RG* 02 37 48.4156380633 -34 36 21.924880181   20.287 18.33   16.75 ~ 3 0
15 [LDH2014] Fnx-mem0675 * 02 37 55.7612173454 -34 50 25.260416025     18.756   17.354 ~ 1 0
16 [LDH2014] Fnx-mem0633 * 02 37 55.8844894019 -34 47 16.036438323   20.157 18.41   16.78 ~ 3 0
17 [LDH2014] Fnx-mem0598 V* 02 38 00.0357678460 -34 44 22.090408580   20.340 18.562   16.702 ~ 2 0
18 [LDH2014] Fnx-mem0704 * 02 38 00.5350365479 -34 52 34.017051513   19.869 18.6   17.23 ~ 3 0
19 [LDH2014] Fnx-mem0532 * 02 38 01.4000018989 -34 40 11.652441699   20.218 18.71   17.17 ~ 2 0
20 [LDH2014] Fnx-mem0543 * 02 38 02.4571031428 -34 41 00.829638627   20.140 18.43   16.86 ~ 3 0
21 [LDH2014] Fnx-rgb0522 RG* 02 38 02.6913039145 -34 37 03.523679134   19.807 18.517   17.154 ~ 2 0
22 [LDH2014] Fnx-mem0538 * 02 38 03.8541120102 -34 40 39.090149618   19.893 18.561     ~ 1 0
23 [LDH2014] Fnx-mem0682 * 02 38 09.0566204400 -34 51 07.089791791   20.268 18.50   16.92 ~ 5 0
24 [LDH2014] Fnx-mem0715 * 02 38 11.1116931668 -34 53 20.643272319   20.257 18.722   17.245 ~ 1 0
25 2MASS J02381393-3446553 RG* 02 38 13.9374655595 -34 46 55.576999149   20.057 18.705   17.36 ~ 3 0
26 [LDH2014] Fnx-mem0725 * 02 38 15.5536322704 -34 54 22.623624563   20.062 18.69   17.48 ~ 2 0
27 [LDH2014] Fnx-mem0664 * 02 38 17.9045522796 -34 49 53.473857429   19.859 18.63   17.37 ~ 3 0
28 2MASS J02381931-3436008 RG* 02 38 19.3172760120 -34 36 00.866348429   19.971 18.4   17.02 ~ 2 0
29 2MASS J02381976-3438540 RG* 02 38 19.7695143696 -34 38 54.144254930   20.508 18.41   16.90 ~ 5 0
30 2MASS J02382132-3436180 AB* 02 38 21.3337701882 -34 36 18.280620293   20.142 18.335   16.393 ~ 3 0
31 [LDH2014] Fnx-mem0626 * 02 38 22.0133579887 -34 46 37.017748385   20.119 18.62   17.14 ~ 3 0
32 [LDH2014] Fnx-mem0607 * 02 38 22.4564078244 -34 45 06.389929359   20.123 18.576   17.014 ~ 2 0
33 [LDH2014] Fnx-rgb0553 RG* 02 38 25.2110208719 -34 41 24.262642203   20.284 18.655   17.033 ~ 1 0
34 [LDH2014] Fnx-mem0574 * 02 38 26.4946397078 -34 42 36.875972927   20.291 18.606   16.979 ~ 1 0
35 2MASS J02383024-3445030 AB* 02 38 30.2417265677 -34 45 03.133903461   20.464 18.324   16.449 ~ 5 0
36 2MASS J02383087-3447446 RG* 02 38 30.8866246603 -34 47 44.438191436   19.847 18.697   17.383 ~ 2 0
37 [LDH2014] Fnx-mem0754 * 02 38 30.9502670717 -34 56 54.271216163   20.178 18.48   16.91 ~ 3 0
38 2MASS J02383502-3442406 RG* 02 38 35.0322735498 -34 42 40.667238911   20.039 18.42   16.93 ~ 2 0
39 2MASS J02383503-3441380 RG* 02 38 35.0343835012 -34 41 38.126413946   20.254 18.56   17.09 ~ 2 0
40 [LDH2014] Fnx-mem0595 * 02 38 35.5498597940 -34 44 02.618661098   20.190 18.47   16.96 ~ 2 0
41 [LDH2014] Fnx-mem0610 * 02 38 36.710 -34 45 20.70   20.006 18.537   16.526 ~ 1 0
42 [LDH2014] Fnx-mem0712 * 02 38 37.1552429607 -34 53 10.480147041   19.855 18.53   17.13 ~ 2 0
43 2MASS J02384018-3439121 AB* 02 38 40.186 -34 39 12.15   20.056 18.3   16.67 ~ 3 0
44 [LDH2014] Fnx-mem0717 * 02 38 40.6019899623 -34 53 30.809835421   20.175 18.5   16.95 ~ 3 0
45 2MASS J02384113-3444205 AB* 02 38 41.1150604495 -34 44 20.562017324   19.672 18.157   16.653 ~ 2 0
46 [LDH2014] Fnx-mem0638 V* 02 38 42.1785862604 -34 47 40.478725663   20.125 18.415   16.791 ~ 6 0
47 [LDH2014] Fnx-mem0678 * 02 38 42.9886509653 -34 50 56.326652057   20.316 18.62   17.07 ~ 3 0
48 [LDH2014] Fnx-mem0572 * 02 38 44.6105412741 -34 42 33.441588102   20.185 18.55   17.1 ~ 2 0
49 [LDH2014] Fnx-mem0556 * 02 38 45.5685258992 -34 41 45.304249511   20.159 18.666   17.171 ~ 1 0
50 [LDH2014] Fnx-mem0546 * 02 38 46.3490737113 -34 41 14.898762591   20.132 18.62   17.25 ~ 2 0
51 2MASS J02384682-3439250 RG* 02 38 46.824 -34 39 25.08   20.082 18.37   16.83 ~ 2 0
52 [LDH2014] Fnx-mem0522 * 02 38 47.8923783724 -34 39 39.732305381   20.149 18.44   16.77 ~ 2 0
53 [LDH2014] Fnx-mem0571 * 02 38 49.4729318574 -34 42 29.643954604   19.802 18.40   16.94 ~ 2 0
54 [LDH2014] Fnx-mem0714 * 02 38 50.2707835549 -34 53 19.563031757   19.641 18.211   16.727 ~ 1 0
55 [LDH2014] Fnx-mem0612 * 02 38 50.9225779083 -34 45 35.382162474   19.887 18.47   17.06 ~ 3 0
56 2MASS J02385229-3444553 AB* 02 38 52.2847431092 -34 44 55.353802747   19.78 18.14   16.41 ~ 6 0
57 [LDH2014] Fnx-mem0631 * 02 38 52.9646171084 -34 47 01.404757995   19.677 18.14   16.73 ~ 2 0
58 [LDH2014] Fnx-mem0634 * 02 38 55.5160993752 -34 47 21.150903148   20.238 18.63   17.2 ~ 2 0
59 [LDH2014] Fnx-mem0613 * 02 38 59.5389905467 -34 45 36.363673981   20.029 18.38   16.46 ~ 4 0
60 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1473 1
61 * alf Cet LP? 03 02 16.77307 +04 05 23.0596 6.10 4.17 2.53 1.18 0.02 M1.5IIIa 438 0
62 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14824 1
63 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2131 0
64 * gam Sge PM* 19 58 45.4286265 +19 29 31.728079 6.97 5.04 3.47 2.27 1.35 M0-III 240 0
65 NAME Local Group GrG ~ ~           ~ 6968 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-14:54:07

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