2019MNRAS.487.4343H

Query : 2019MNRAS.487.4343H

2019MNRAS.487.4343H - Mon. Not. R. Astron. Soc., 487, 4343-4354 (2019/August-2)

Origin of α-rich young stars: clues from C, N, and O.

HEKKER S. and JOHNSON J.A.

Abstract (from CDS):

A small set of chemically old stars that appear young by their independently derived masses has been detected. These are so-called α-rich young stars. For a sample of 51 red-giant stars, for which spectra are available from SDSS/APOGEE and masses are available from asteroseismic measures based on Kepler lightcurves, we derive the C, N, and O abundances through an independent analysis. These stars span a wide range of N/C surface number density ratios. We interpret the high-mass stars with low N/C as being products of mergers or mass transfer during or after first dredge up, because the dredge-up features are the same as for low-mass stars. The α-rich young stars with high N/C follow the expected trend of N/C for their mass, and could be either genuine young stars (leaving their high [α/Fe] unexplained) or the results of mergers on the main sequence.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: abundances - Galaxy: abundances

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 TYC 3126-2204-1 HB* 18 46 20.4638262432 +42 07 59.403040896   12.89 11.92     ~ 27 0
2 BD+44 2989 HB* 18 46 41.6451025656 +44 41 06.457223760 10.880 10.350 9.450     G5V: 46 0
3 TYC 3126-801-1 RG* 18 46 43.1010145152 +42 23 14.348294124   12.27 11.47     G6V 40 0
4 TYC 3126-3019-1 HB* 18 48 35.1209288304 +42 55 51.761340660   12.08 11.30     G5V: 29 0
5 2MASS J18540578+4520474 RG* 18 54 05.7760158024 +45 20 47.469332688           K5II 32 0
6 2MASS J18553092+4042447 HB* 18 55 30.9209322984 +40 42 44.671799880           ~ 30 0
7 UCAC4 647-063819 RG* 18 59 52.4435740656 +39 17 51.310208220       12.470   G3V 31 0
8 TYC 3124-62-1 HB* 19 01 13.0958998968 +39 30 13.091457168   12.20 11.22     ~ 27 0
9 UCAC4 646-065378 RG* 19 02 29.0239025688 +39 03 48.566887884       13.428   ~ 24 0
10 TYC 3132-924-1 HB* 19 02 34.8344204981 +44 44 08.771438141   12.026 10.850 10.621   ~ 30 0
11 TYC 3120-1371-1 HB* 19 02 43.0466794632 +38 54 59.337624384   10.71 9.56     ~ 40 0
12 2MASS J19031115+4753540 RG* 19 03 11.1576896280 +47 53 54.074887332           K0II 29 0
13 2MASS J19032243+4547495 HB* 19 03 22.4332337952 +45 47 49.515065124           K0III 35 0
14 2MASS J19052620+4921373 HB* 19 05 26.2030695168 +49 21 37.307260728           K1III 26 0
15 TYC 3120-1202-1 HB* 19 05 54.6516306192 +37 35 05.309077812   12.96 12.38     G8IV-V 30 0
16 2MASS J19070280+4530112 RG* 19 07 02.8058609184 +45 30 11.218149648           K1IV 28 0
17 TYC 3124-640-1 RG* 19 08 17.1693797784 +39 24 58.374039168   13.15 11.89     K1IV 49 0
18 TYC 3120-1424-1 HB* 19 08 35.6690386488 +38 07 13.103371236   12.45 11.95     ~ 27 0
19 UCAC4 684-065062 RG* 19 08 36.1588752720 +46 41 21.253098480   13.228 12.216 12.051   ~ 48 0
20 TYC 3132-1585-1 HB* 19 08 43.5537948912 +43 17 58.592509944   13.14 11.68     G8III 37 0
21 UCAC4 706-062052 HB* 19 08 59.0063465472 +51 01 16.830560604   13.617 12.504 12.260   G8IV-V 32 0
22 TYC 3542-868-1 RG* 19 09 38.0164418112 +46 35 25.278158436   13.42 11.94     ~ 31 0
23 TYC 3550-530-1 HB* 19 09 40.0087056648 +49 13 39.329796972   12.98 12.03     G8IV 41 0
24 TYC 3121-1613-1 HB* 19 10 11.5398709320 +39 14 58.306278192   12.85 12.16     ~ 39 0
25 TYC 3546-1967-1 HB* 19 10 21.3462763128 +47 43 19.394938092   11.78 11.04     ~ 38 0
26 TYC 3125-2739-1 HB* 19 10 22.6793431680 +39 38 59.070586416   12.71 12.02     K0II 25 0
27 2MASS J19151828+4736422 HB* 19 15 18.2841494352 +47 36 42.181833456           K0III 30 0
28 UCAC3 259-150424 RG* 19 17 07.1190989304 +39 04 39.104949864   14.07 12.95 12.962 11.86 ~ 19 0
29 KOI-8113 RG* 19 22 52.2837403560 +41 14 50.364168468   13.652 12.630 12.433   K0II 29 0
30 2MASS J19252892+3858022 HB* 19 25 28.9298469024 +38 58 02.293793040           ~ 31 0
31 TYC 2666-241-1 RG* 19 25 49.8550150032 +37 01 02.845959816   13.83 12.57     ~ 27 0
32 UCAC4 635-069846 RG* 19 25 58.3861144128 +36 50 55.696878564   13.473 12.292 12.052   ~ 25 0
33 TYC 3556-813-1 RG* 19 31 36.7121134032 +45 32 50.046044604   12.64 12.23     ~ 35 0
34 BD+40 3780 HB* 19 33 08.6719796232 +41 03 08.599856796   10.27 9.39     G5 37 0
35 UCAC4 650-072669 HB* 19 33 17.3369775936 +39 48 19.482108768   12.625 11.839 11.672   G8III 28 0
36 UCAC4 649-071593 HB* 19 34 22.3470092808 +39 45 13.967170236   13.365   12.282   ~ 25 0
37 UCAC4 671-075541 RG* 19 37 00.0602497728 +44 02 59.045662392   13.999 12.969 12.753   G8IV-V 26 0
38 2MASS J19370398+3954132 HB* 19 37 03.9759583464 +39 54 13.184305776           ~ 26 0
39 TYC 3135-530-1 HB* 19 37 31.6914973104 +39 13 48.213918048   13.01 12.16     ~ 27 0
40 UCAC4 700-069227 RG* 19 37 40.6766635968 +49 53 42.502359192   14.222 13.178 12.959   G8IV 26 0
41 TYC 3135-468-1 RG* 19 37 45.7037223720 +38 35 35.637269388   12.13 11.39     K2IIIb 49 0
42 2MASS J19382435+3847454 RG* 19 38 24.3519329784 +38 47 45.336253992           ~ 27 0
43 TYC 3564-3001-1 HB* 19 41 12.8057337384 +50 09 27.971511300   13.79 12.00     ~ 31 0
44 TYC 3140-1194-1 RG* 19 42 40.5383229096 +39 35 23.410857120   13.00 12.14     ~ 33 0
45 UCAC4 646-074930 RG* 19 44 37.5925625352 +39 01 10.281812592   14.675 13.498 13.135   ~ 27 0
46 TYC 3565-661-1 HB* 19 45 52.9229247240 +50 02 30.462826812   12.61 11.33     ~ 38 0
47 TYC 3557-1587-1 HB* 19 51 33.4475846040 +46 17 49.804403316   12.64 11.39     ~ 32 0
48 HD 188795 RG* 19 54 46.5767022696 +47 05 20.052345660   10.99 9.96     G9IIIb 42 0
49 TYC 3562-1082-1 HB* 19 55 12.3212336664 +48 17 34.408074948   12.00 11.04     K0III 37 0
50 UCAC4 686-074413 HB* 19 55 30.0703413696 +47 01 18.904525140   14.607 13.556 13.309   ~ 21 0
51 NAME Galactic Bar reg ~ ~           ~ 1458 0

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