2021AJ....161..288G

Query : 2021AJ....161..288G

2021AJ....161..288G - Astron. J., 161, 288-288 (2021/June-0)

Light element abundances and multiple populations in M53.

GERBER J.M., FRIEL E.D. and VESPERINI E.

Abstract (from CDS):

We present results from a study of 94 red giant stars in the globular cluster M53. We use low-resolution spectra to measure the strength of CN and CH features at ∼3800 and 4300 Å, respectively. The strengths of these features are used to classify stars into a CN-enhanced and CN-normal population and to measure C and N abundances in all 94 stars. We find the red giant branch stars to be evenly split between the two populations identified, and observe the presence of CN-enhanced stars on the asymptotic giant branch. In addition, we identify five CH star candidates based on the strength of their CN and CH band features, and the presence of a P-branch in their CH band. We compare our identification of multiple populations to those based on the Na-O anticorrelation and pseudo-color indices in Hubble Space Telescope UV photometry, and find general agreement between all three methods. Our large sample size also allows us to study the radial distribution of each population, and we find that the CN-enhanced population is more centrally concentrated. We use our C and N measurements to compare the evolutionary changes in these elements as a function of magnitude between the two populations, and show that both populations experience similar evolutionary changes to the surface abundances of C and N. Finally, we calculate C+N+O abundances for each population and compare them to similar measurements made in M10; we find that in both clusters, CN-enhanced stars have a slightly enhanced C+N+O (Δ(C+N+O) ∼ 0.2 dex).

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Globular star clusters - Stellar evolution - Stellar abundances

VizieR on-line data: <Available at CDS (J/AJ/161/288): table1.dat>

Status at CDS : Tables of objects mostly ingested in SIMBAD; some problems could not be solved.

CDS comments: Table 1 : coordinates from 1998AJ....116.1775R; they can be even more than 5'' inaccurate; only objects retrieved by identifier have been ingested in SIMBAD.

Simbad objects: 67

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Number of rows : 67
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 2419 GlC 07 38 08.51 +38 52 54.9     10.05     ~ 998 0
3 * c Vir RG* 12 20 20.9813922197 +03 18 45.255217001 7.27 6.12 4.96 4.07 3.46 K0.5IIIbFe-0.5 380 0
4 * bet CVn ** 12 33 44.5442516547 +41 21 26.921352859 4.91 4.86 4.25 3.73 3.42 G0V 613 0
5 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
6 Cl* NGC 5024 RLB 101 RG* 13 12 35.0587311768 +18 14 28.583798568     15.25     ~ 12 0
7 Cl* NGC 5024 SAW V84 RG* 13 12 36.1753655928 +18 07 31.974328488   15.481 14.77 14.731 13.591 ~ 21 0
8 Cl* NGC 5024 RLB 44 RG* 13 12 43.9377709248 +18 10 09.207065532     14.41     ~ 10 0
9 Cl* NGC 5024 RLB 4 RG* 13 12 45.5211084600 +18 11 28.895911584     13.78     ~ 19 0
10 Cl* NGC 5024 RLB 124 RG* 13 12 47.4671115840 +18 14 40.500891024     15.42     ~ 3 0
11 Cl* NGC 5024 RLB 131 RG* 13 12 47.5174474032 +18 14 30.981578244     15.47     ~ 2 0
12 Cl* NGC 5024 RLB 39 RG* 13 12 47.6861552712 +18 10 06.002040936     14.34     ~ 15 0
13 Cl* NGC 5024 RLB 72 RG* 13 12 47.9380102824 +18 06 32.058531072   15.939 14.901 14.763 13.74 ~ 20 0
14 Cl* NGC 5024 RLB 70 RG* 13 12 48.0857311800 +18 14 15.885900276     14.85     ~ 2 0
15 Cl* NGC 5024 RLB 53 RG* 13 12 48.1900132272 +18 12 46.485776088   15.67 14.59   13.39 ~ 17 0
16 Cl* NGC 5024 RLB 122 RG* 13 12 48.3767268624 +18 12 08.612662932     15.40     ~ 3 0
17 Cl* NGC 5024 RLB 40 RG* 13 12 48.6008575320 +18 14 15.599627232   15.54 14.34   13.06 ~ 4 0
18 Cl* NGC 5024 RLB 112 AB* 13 12 49.5954936888 +18 08 24.613003212     15.31     ~ 2 0
19 Cl* NGC 5024 RLB 91 RG* 13 12 49.680 +18 11 13.57     15.11     ~ 2 0
20 Cl* NGC 5024 RLB 87 RG* 13 12 49.8713871096 +18 11 48.683917104     15.08     ~ 13 0
21 Cl* NGC 5024 RLB 111 RG* 13 12 50.3823607728 +18 14 39.088867344     15.31     ~ 17 0
22 Cl* NGC 5024 RLB 29 RG* 13 12 50.4303875760 +18 08 53.657898144   15.40 14.11   12.74 ~ 4 0
23 2MASS J13125069+1810396 RG* 13 12 50.6977816224 +18 10 39.577288260     13.962   12.605 ~ 5 0
24 Cl* NGC 5024 RLB 15 RG* 13 12 50.9529351216 +18 09 36.012252456     13.93     ~ 2 0
25 Cl* NGC 5024 SAW V86 RG* 13 12 52.7226308544 +18 10 27.978544488     14.08     ~ 5 0
26 Cl* NGC 5024 RLB 86 RG* 13 12 54.9624609288 +18 05 35.082482316     15.08     ~ 17 0
27 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
28 Cl* NGC 5024 RLB 61 RG* 13 12 55.5923667312 +18 13 13.844397324   15.79 14.74   13.59 ~ 4 0
29 Cl* NGC 5024 RLB 10 RG* 13 12 55.6517389392 +18 11 23.624486412     13.84     ~ 2 0
30 Cl* NGC 5024 RLB 47 RG* 13 12 56.0085490848 +18 11 08.190764592     14.52     ~ 2 0
31 Cl* NGC 5024 RLB 97 RG* 13 12 56.5053932232 +18 12 37.452067308     15.21     ~ 13 0
32 Cl* NGC 5024 SAW V68 RG* 13 12 56.5708094016 +18 08 23.084391372     13.85     ~ 4 0
33 Cl* NGC 5024 RLB 20 RG* 13 12 56.9440390968 +18 08 41.915762340   15.34 14.04   12.69 ~ 4 0
34 Cl* NGC 5024 RLB 60 RG* 13 12 57.2555059224 +18 06 04.988806668     14.73     ~ 14 0
35 Cl* NGC 5024 RLB 7 RG* 13 12 57.7094560224 +18 09 00.588284820     13.82     ~ 2 0
36 Cl* NGC 5024 RLB 95 RG* 13 12 58.5646235544 +18 09 13.512112920     15.19     ~ 2 0
37 Cl* NGC 5024 RLB 107 RG* 13 13 00.1199696328 +18 12 17.677237320     15.30     ~ 4 0
38 Cl* NGC 5024 RLB 64 RG* 13 13 00.940 +18 12 01.22     14.76     ~ 2 0
39 ZTF J131301.01+181009.5 LP* 13 13 01.0228571664 +18 10 09.553093176     14.08     ~ 9 0
40 Cl* NGC 5024 SAW V66 RG* 13 13 01.5765897096 +18 10 03.910652724     13.83     ~ 6 0
41 Cl* NGC 5024 RLB 68 RG* 13 13 02.4611071944 +18 13 23.357610228   15.86 14.83   13.68 ~ 19 0
42 Cl* NGC 5024 RLB 38 AB* 13 13 02.9305580544 +18 11 06.602887104     14.31     ~ 2 0
43 Cl* NGC 5024 RLB 77 RG* 13 13 03.3470691699 +18 11 43.518892768     14.91     ~ 10 0
44 Cl* NGC 5024 RLB 99 RG* 13 13 04.4206499136 +18 08 55.674127680     15.24     ~ 17 0
45 Cl* NGC 5024 SAW V65 RG* 13 13 04.6702313832 +18 10 59.431944540     13.91     ~ 13 0
46 Cl* NGC 5024 RLB 54 RG* 13 13 05.3061752352 +18 14 51.010537524   15.69 14.62   13.42 ~ 16 0
47 Cl* NGC 5024 RLB 84 RG* 13 13 09.4544452968 +18 11 18.878448084     15.01     ~ 9 0
48 Cl* NGC 5024 RLB 128 RG* 13 13 10.0591573032 +18 06 15.238316952     15.45     ~ 17 0
49 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
50 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
51 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
52 HD 132737 PM* 14 59 52.3925471952 +27 09 37.034902080   8.65 7.63     K0III 59 0
53 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
54 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
55 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
56 NGC 6242 OpC 16 55 31.8 -39 28 09           ~ 98 0
57 NGC 6257 LSB 16 56 03.524 +39 38 43.81   15.6       ~ 32 0
58 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
59 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
60 M 14 GlC 17 37 36.15 -03 14 45.3   9.55 5.73     ~ 420 0
61 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
62 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 244 0
63 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
64 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
65 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
66 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
67 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1

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