2018AJ....155..183S

Query : 2018AJ....155..183S

2018AJ....155..183S - Astron. J., 155, 183-183 (2018/April-0)

Stellar variability at the main-sequence turnoff of the intermediate-age LMC cluster NGC 1846.

SALINAS R., PAJKOS M.A., VIVAS A.K., STRADER J. and CONTRERAS RAMOS R.

Abstract (from CDS):

Intermediate-age (IA) star clusters in the Large Magellanic Cloud (LMC) present extended main-sequence turn-offs (MSTO) that have been attributed to either multiple stellar populations or an effect of stellar rotation. Recently it has been proposed that these extended main sequences can also be produced by ill-characterized stellar variability. Here we present Gemini-S/Gemini Multi-Object Spectrometer (GMOS) time series observations of the IA cluster NGC 1846. Using differential image analysis, we identified 73 new variable stars, with 55 of those being of the Delta Scuti type, that is, pulsating variables close the MSTO for the cluster age. Considering completeness and background contamination effects, we estimate the number of δ Sct belonging to the cluster between 40 and 60 members, although this number is based on the detection of a single δ Sct within the cluster half-light radius. This amount of variable stars at the MSTO level will not produce significant broadening of the MSTO, albeit higher-resolution imaging will be needed to rule out variable stars as a major contributor to the extended MSTO phenomenon. Though modest, this amount of δ Sct makes NGC 1846 the star cluster with the highest number of these variables ever discovered. Lastly, our results present a cautionary tale about the adequacy of shallow variability surveys in the LMC (like OGLE) to derive properties of its δ Sct population.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): globular clusters: individual: NGC 1846 - Magellanic Clouds - stars: variables: delta Scuti

VizieR on-line data: <Available at CDS (J/AJ/155/183): table1.dat>

Nomenclature: Fig. 2, Table 1: [SPV2018] VNN (Nos V1-V76).

Simbad objects: 79

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Number of rows : 79
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7123 0
2 [SPV2018] V1 EB* 05 07 10.061 -67 28 34.35           ~ 1 0
3 [SPV2018] V2 dS* 05 07 11.184 -67 28 34.85           ~ 1 0
4 [SPV2018] V3 dS* 05 07 11.684 -67 29 44.91           ~ 1 0
5 [SPV2018] V4 dS* 05 07 13.242 -67 27 51.07           ~ 1 0
6 [SPV2018] V5 EB* 05 07 15.079 -67 27 30.68           ~ 1 0
7 [SPV2018] V6 dS* 05 07 15.856 -67 30 03.18           ~ 1 0
8 [SPV2018] V7 dS* 05 07 16.925 -67 25 07.09           ~ 1 0
9 [SPV2018] V8 dS* 05 07 16.946 -67 26 52.67           ~ 1 0
10 [SPV2018] V9 dS* 05 07 17.633 -67 29 31.52           ~ 1 0
11 [SPV2018] V10 dS* 05 07 19.007 -67 28 24.38           ~ 1 0
12 [SPV2018] V11 EB* 05 07 19.084 -67 27 34.23           ~ 1 0
13 OGLE LMC-RRLYR-5278 RR* 05 07 20.0570562504 -67 29 57.693258204     19.239   18.652 ~ 9 0
14 [SPV2018] V13 dS* 05 07 20.256 -67 25 30.38           ~ 1 0
15 [SPV2018] V14 dS* 05 07 22.364 -67 30 26.48           ~ 1 0
16 [SPV2018] V15 dS* 05 07 22.9281851496 -67 28 07.172375016           ~ 1 0
17 [SPV2018] V16 dS* 05 07 23.480 -67 27 21.83           ~ 1 0
18 [SPV2018] V17 dS* 05 07 23.651 -67 30 04.94           ~ 1 0
19 [SPV2018] V18 dS* 05 07 24.485 -67 27 08.23           ~ 1 0
20 [SPV2018] V19 V* 05 07 24.787 -67 27 27.30           ~ 1 0
21 [SPV2018] V20 dS* 05 07 25.334 -67 26 53.16           ~ 1 0
22 [SPV2018] V21 dS* 05 07 25.431 -67 26 37.37           ~ 1 0
23 [SPV2018] V22 dS* 05 07 27.099 -67 25 24.06           ~ 1 0
24 [SPV2018] V23 dS* 05 07 27.237 -67 27 02.63           ~ 1 0
25 [SPV2018] V24 dS* 05 07 28.438 -67 26 11.55           ~ 1 0
26 [SPV2018] V25 EB* 05 07 30.025 -67 28 18.75           ~ 1 0
27 [SPV2018] V26 dS* 05 07 30.772 -67 25 42.96           ~ 1 0
28 [SPV2018] V27 dS* 05 07 31.2792682944 -67 26 12.005371392           ~ 1 0
29 [SPV2018] V28 dS* 05 07 31.454 -67 29 44.21           ~ 1 0
30 [SPV2018] V29 EB* 05 07 31.953 -67 25 14.02           ~ 1 0
31 [SPV2018] V30 dS* 05 07 32.221 -67 25 11.77           ~ 1 0
32 [SPV2018] V31 dS* 05 07 32.974 -67 28 19.35           ~ 1 0
33 [SPV2018] V32 dS* 05 07 33.023 -67 26 56.07           ~ 1 0
34 [SPV2018] V33 dS* 05 07 33.096 -67 30 01.91           ~ 1 0
35 [SPV2018] V34 V* 05 07 33.336 -67 25 32.26           ~ 1 0
36 [SPV2018] V35 dS* 05 07 33.519 -67 28 22.44           ~ 1 0
37 [SPV2018] V36 dS* 05 07 34.001 -67 28 16.31           ~ 1 0
38 [SPV2018] V37 dS* 05 07 34.180 -67 25 48.84           ~ 1 0
39 NGC 1846 Cl* 05 07 34.900 -67 27 32.45   12.08 11.31     ~ 216 0
40 [SPV2018] V38 dS* 05 07 35.155 -67 28 38.01           ~ 1 0
41 [SPV2018] V39 dS* 05 07 35.2671230208 -67 26 20.426078940           ~ 1 0
42 [SPV2018] V40 EB* 05 07 36.298 -67 26 11.30           ~ 1 0
43 OGLE LMC-RRLYR-5379 RR* 05 07 36.4259532768 -67 30 20.055270384     19.211   18.870 ~ 7 0
44 [SPV2018] V42 dS* 05 07 36.4306421976 -67 25 32.087202420           ~ 1 0
45 [SPV2018] V43 dS* 05 07 37.626 -67 28 21.32           ~ 1 0
46 [SPV2018] V44 dS* 05 07 37.799 -67 28 33.29           ~ 1 0
47 [SPV2018] V45 dS* 05 07 37.816 -67 27 12.63           ~ 1 0
48 [SPV2018] V46 dS* 05 07 38.220 -67 26 53.09           ~ 1 0
49 [SPV2018] V47 dS* 05 07 38.335 -67 25 36.50           ~ 1 0
50 OGLE LMC-RRLYR-5394 RR* 05 07 38.4175137528 -67 25 56.188313076     19.411   18.941 ~ 9 0
51 [SPV2018] V49 RR* 05 07 38.618 -67 27 53.52           ~ 1 0
52 [SPV2018] V50 V* 05 07 38.767 -67 25 09.38           ~ 1 0
53 [SPV2018] V51 dS* 05 07 39.109 -67 29 28.91           ~ 1 0
54 [SPV2018] V52 dS* 05 07 39.754 -67 28 36.16           ~ 1 0
55 [SPV2018] V53 dS* 05 07 39.796 -67 25 43.87           ~ 1 0
56 [SPV2018] V54 dS* 05 07 42.020 -67 30 02.59           ~ 1 0
57 [SPV2018] V55 V* 05 07 42.945 -67 26 05.89           ~ 1 0
58 [SPV2018] V56 EB* 05 07 43.251 -67 29 03.09           ~ 1 0
59 [SPV2018] V57 dS* 05 07 45.914 -67 28 30.28           ~ 1 0
60 [SPV2018] V58 dS* 05 07 45.9852712464 -67 25 54.009259320           ~ 1 0
61 [SPV2018] V59 V* 05 07 46.526 -67 27 41.14           ~ 1 0
62 [SPV2018] V60 V* 05 07 46.679 -67 25 40.43           ~ 1 0
63 [SPV2018] V61 RR* 05 07 47.170 -67 28 22.70           ~ 1 0
64 [SPV2018] V62 dS* 05 07 48.4047314496 -67 25 39.327173904           ~ 1 0
65 [SPV2018] V63 dS* 05 07 49.0420631688 -67 25 54.880216356           ~ 1 0
66 [SPV2018] V64 V* 05 07 49.655 -67 28 25.60           ~ 1 0
67 [SPV2018] V65 dS* 05 07 50.038 -67 28 11.99           ~ 1 0
68 [SPV2018] V66 dS* 05 07 50.236 -67 28 22.26           ~ 1 0
69 [SPV2018] V67 EB* 05 07 53.337 -67 28 42.72           ~ 1 0
70 [SPV2018] V68 dS* 05 07 53.811 -67 27 21.08           ~ 1 0
71 [SPV2018] V69 dS* 05 07 54.035 -67 27 55.26           ~ 1 0
72 [SPV2018] V70 RR* 05 07 54.560 -67 29 40.68           ~ 1 0
73 [SPV2018] V71 dS* 05 07 54.581 -67 27 57.52           ~ 1 0
74 [SPV2018] V72 dS* 05 07 55.982 -67 28 30.90           ~ 1 0
75 [SPV2018] V73 dS* 05 07 56.233 -67 26 10.71           ~ 1 0
76 [SPV2018] V74 dS* 05 07 56.8878246816 -67 27 46.656418968           ~ 1 0
77 [SPV2018] V75 dS* 05 07 59.875 -67 25 28.64           ~ 1 0
78 [SPV2018] V76 EB* 05 08 00.985 -67 28 55.19           ~ 1 0
79 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17544 0

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