2018A&A...617A...4S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST17:50:41

2018A&A...617A...4S - Astronomy and Astrophysics, volume 617A, 4-4 (2018/9-1)

The Gaia-ESO Survey: properties of newly discovered Li-rich giants.

SMILJANIC R., FRANCIOSINI E., BRAGAGLIA A., TAUTVAISIENE G., FU X., PANCINO E., ADIBEKYAN V., SOUSA S.G., RANDICH S., MONTALBAN J., PASQUINI L., MAGRINI L., DRAZDAUSKAS A., GARCIA R.A., MATHUR S., MOSSER B., REGULO C., DE ASSIS PERALTA R., HEKKER S., FEUILLET D., VALENTINI M., MOREL T., MARTELL S., GILMORE G., FELTZING S., VALLENARI A., BENSBY T., KORN A.J., LANZAFAME A.C., RECIO-BLANCO A., BAYO A., CARRARO G., COSTADO M.T., FRASCA A., JOFRE P., LARDO C., DE LAVERNY P., LIND K., MASSERON T., MONACO L., MORBIDELLI L., PRISINZANO L., SBORDONE L. and ZAGGIA S.

Abstract (from CDS):


Aims. We report 20 new lithium-rich giants discovered within the Gaia-ESO Survey, including the first Li-rich giant with an evolutionary stage confirmed by CoRoT (Convection, Rotation and planetary Transits) data. We present a detailed overview of the properties of these 20 stars.
Methods. Atmospheric parameters and abundances were derived in model atmosphere analyses using medium-resolution GIRAFFE or high-resolution UVES (Ultraviolet and Visual Echelle Spectrograph) spectra. These results are part of the fifth internal data release of the Gaia-ESO Survey. The Li abundances were corrected for non-local thermodynamical equilibrium effects. Other stellar properties were investigated for additional peculiarities (the core of strong lines for signs of magnetic activity, infrared magnitudes, rotational velocities, chemical abundances, and Galactic velocities). We used Gaia DR2 parallaxes to estimate distances and luminosities.
Results. The giants have A(Li)>2.2dex. The majority of them (14 of 20 stars) are in the CoRoT fields. Four giants are located in the field of three open clusters, but are not members. Two giants were observed in fields towards the Galactic bulge, but likely lie in the inner disc. One of the bulge field giants is super Li-rich with A(Li)=4.0dex.
Conclusions. We identified one giant with infrared excess at 22µm. Two other giants, with large v sin i, might be Li-rich because of planet engulfment. Another giant is found to be barium enhanced and thus could have accreted material from a former asymptotic giant branch companion. Otherwise, in addition to the Li enrichment, the evolutionary stages are the only other connection between these new Li-rich giants. The CoRoT data confirm that one Li-rich giant is at the core-He burning stage. The other giants are concentrated in close proximity to the red giant branch luminosity bump, the core-He burning stages, or the early-asymptotic giant branch. This is very clear from the Gaia-based luminosities of the Li-rich giants. This is also seen when the CoRoT Li-rich giants are compared to a larger sample of 2252 giants observed in the CoRoT fields by the Gaia-ESO Survey, which are distributed throughout the red giant branch in the Teff-logg diagram. These observations show that the evolutionary stage is a major factor for the Li enrichment in giants. Other processes, such as planet accretion, contribute at a smaller scale.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: abundances - stars: evolution - stars: late-type

Simbad objects: 50

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Number of rows : 50

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 CoRoT-19 * 06 28 08.0586283720 -00 10 14.532354610   14.780 14.007 14.17 13.00 ~ 22 1
2 C 0634+094 OpC 06 36 29 +09 28.2     10.9     ~ 76 0
3 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 317 0
4 GES J08095783-4701385 * 08 09 57.8388386590 -47 01 38.341202867     12.63   11.45 ~ 7 0
5 2MASS J08095784-4701383 IR 08 09 57.84312 -47 01 38.3268           ~ 2 0
6 2MASS J08102116-4740125 Y*? 08 10 21.1559976695 -47 40 12.506281562   15.70 14.27   12.74 ~ 5 0
7 2MASS J08110403-4852137 pr* 08 11 04.0350950981 -48 52 13.807478265       14.19 13.51 ~ 6 0
8 2MASS J08113284-4721004 Y*? 08 11 32.8413219827 -47 21 00.374440422   15.05 13.78   12.38 ~ 2 0
9 2MASS J08395152-5315159 * 08 39 51.5292180593 -53 15 15.912976648           ~ 4 0
10 Cl* IC 2391 AR 165 * 08 40 56.4380821887 -53 08 30.998248219     14.48     ~ 4 0
11 2MASS J10300194-6321203 * 10 30 01.9594397686 -63 21 20.338200740           ~ 4 0
12 2MASS J10323205-6324012 * 10 32 32.0552108644 -63 24 01.188262631           ~ 4 0
13 2MASS J10495719-6341212 * 10 49 57.1964669901 -63 41 21.257612645           ~ 4 0
14 2MASS J10503632-6512237 * 10 50 36.3216822089 -65 12 23.689972461           ~ 4 0
15 2MASS J11000515-7623259 * 11 00 05.1417934234 -76 23 26.018059496           ~ 3 0
16 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1808 1
17 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11753 0
18 GES J17522490-2927512 * 17 52 24.9111139933 -29 27 51.287838582           ~ 2 0
19 C 1749-295 OpC 17 52 43 -29 33.0           ~ 19 0
20 GES J17531013-2932063 * 17 53 10.1370176340 -29 32 06.223133155           ~ 2 0
21 2MASS J18033785-3009200 * 18 03 37.8502917184 -30 09 20.178727380           ~ 4 0
22 [TGB2011] J181810.6197-324629.179 * 18 18 10.6171194738 -32 46 29.100093176     11.9     ~ 5 0
23 GES J18182698-3242584 * 18 18 26.9787081860 -32 42 58.433315090           ~ 3 0
24 Cl* NGC 6633 JEF 49 * 18 26 52.4839681432 +06 27 25.962666501   15.70 14.50   13.19 ~ 4 0
25 NGC 6633 OpC 18 27 31.2 +06 34 12           ~ 326 0
26 CoRoT 100440565 RG* 19 22 30.5244288605 +01 38 52.017113180   14.666 13.149 12.665   ~ 3 0
27 2MASS J19230934+0123293 * 19 23 09.3474283057 +01 23 29.355667771           ~ 3 0
28 GES J19251759+0053140 * 19 25 17.5911387614 +00 53 14.166033605     14.55     ~ 2 0
29 2MASS J19252571+0031444 * 19 25 25.7182810463 +00 31 44.429670840           ~ 3 0
30 2MASS J19252758+0153064 * 19 25 27.5856241794 +01 53 06.562357133           ~ 4 0
31 2MASS J19252837+0027037 * 19 25 28.3701058493 +00 27 03.735154164           ~ 3 0
32 2MASS J19253819+0031094 * 19 25 38.2011752307 +00 31 09.446193653           ~ 3 0
33 CoRoT 101064590 V* 19 26 11.3486257280 +00 51 56.923215334   16.292 15.083 14.858   ~ 3 0
34 GES J19263808+0054441 * 19 26 38.0684188841 +00 54 44.248534366     13.28     ~ 2 0
35 CoRoT 101137056 V* 19 26 40.3803261016 -00 19 57.654395887     15.371 15.022   ~ 4 0
36 CoRoT 101139596 V* 19 26 41.3365887282 +01 37 59.513706997   15.849 14.430 14.004   ~ 3 0
37 GES J19264917-0027469 * 19 26 49.1713888764 -00 27 46.980308445           ~ 2 0
38 GES J19265013+0149070 * 19 26 50.1372993308 +01 49 07.064924015     15.86     ~ 2 0
39 CoRoT 101167637 RG* 19 26 51.9469539789 +00 44 00.326526730   14.302 13.037 12.746   ~ 5 0
40 CoRoT 101205220 V* 19 27 05.9980070230 +01 34 44.629684327   16.368 14.872 14.654   ~ 3 0
41 GES J19270815+0017461 * 19 27 08.1526870106 +00 17 46.164125916           ~ 2 0
42 GES J19273856+0024149 * 19 27 38.5693667045 +00 24 14.914992169     15.37     ~ 2 0
43 GES J19274706+0023447 * 19 27 47.0731801502 +00 23 44.918895386           ~ 2 0
44 GES J19280508+0100139 * 19 28 05.0771336115 +01 00 13.908250980     15.25     ~ 2 0
45 CoRoT 101411079 V* 19 28 32.2623916580 +00 33 07.211784507     14.817 14.37   ~ 3 0
46 CoRoT 101657424 EB* 19 30 18.8349311192 -00 04 17.654277706   16.584 14.891 14.459 13.145 ~ 5 0
47 NGC 6802 OpC 19 30 36.0 +20 15 34   10.07 8.8     ~ 79 0
48 2MASS J19304281+2016107 * 19 30 42.8173731143 +20 16 10.675497143           ~ 3 0
49 NGC 6819 OpC 19 41 18 +40 11.2   8.21 7.3     ~ 473 0
50 NAME Galactic Bulge reg ~ ~           ~ 3454 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-17:50:41

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