2019ApJS..244...12W


Query : 2019ApJS..244...12W

2019ApJS..244...12W - Astrophys. J., Suppl. Ser., 244, 12-12 (2019/September-0)

A search for variable stars in the globular cluster M4 with K2.

WALLACE J.J., HARTMAN J.D., BAKOS G.A. and BHATTI W.

Abstract (from CDS):

We extract light curves for 4554 objects with 9 < G < 19 in the K2 superstamp observations of the globular cluster M4, including 3784 cluster members, and search for variability. Among cluster-member objects, we detect 66 variables, of which 52 are new discoveries. Among objects not belonging to the cluster, we detect 24 variables, of which 20 are new discoveries. We additionally discover 57 cluster-member suspected variables, 10 cluster-non-member suspected variables, and four variables with ambiguous cluster membership. Our light curves reach sub-millimagnitude precision for the cluster horizontal branch, permitting us to detect asteroseismic activity in six horizontal branch stars outside the instability strip and one inside the strip but with only ∼1 mmag amplitude variability. Nineteen additional stars along the red giant branch also have detected asteroseismic variability. Several eclipsing binaries are found in the cluster, including a 4.6 day detached eclipsing binary and an EW-class eclipsing binary, as well as an EW with uncertain cluster membership and three other candidate EWs. A 22 day detached eclipsing binary is also found outside the cluster. We identify a candidate X-ray binary that is a cluster member with quiescent and periodic ∼20 mmag optical variability. We also obtain high-precision light curves for 10 of the previously known RR Lyrae variables in the cluster and identify one as a candidate Blazhko variable with a Blazhko period in excess of 78 days. We make our light curves publicly available.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Close binary stars - Detached binary stars - Semi-detached binary stars - Binary stars - Eclipses - Eclipsing binary stars - Globular star clusters - RR Lyrae variable stars - Variable stars - X-ray binary stars - W Ursae Majoris variable stars - Algol variable stars

VizieR on-line data: <Available at CDS (J/ApJS/244/12): table1.dat table2.dat table3.dat table4.dat table5.dat lcs/*>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 48

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Number of rows : 48
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * gam Dor gD* 04 16 01.5866224848 -51 29 11.932714356   4.55 4.20     F1V 299 0
2 NGC 2158 OpC 06 07 27 +24 05.9           ~ 275 0
3 NGC 2168 OpC 06 09 05 +24 20.2           ~ 519 0
4 NGC 2185 RNe 06 10 -06.2   12.9       B3 7 0
5 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1434 0
6 NGC 2682 OpC 08 51 23 +11 48.8           ~ 2220 0
7 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 367 0
8 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 679 0
9 Cl* NGC 6121 SAW V35 RR* 16 23 06.5705996112 -26 30 27.183566880 14.42 14.14 13.38 12.84 12.30 ~ 18 0
10 NGC 6121 424 RG* 16 23 16.9017005856 -26 29 47.955475500 15.28 14.389 13.100   11.559 ~ 17 0
11 2MASS J16232195-2630320 RG* 16 23 21.9541703184 -26 30 32.055462756 15.63 14.878 13.643   12.148 ~ 10 0
12 HD 147491 dS* 16 23 22.9345588464 -26 22 16.408178328   10.22 9.84 9.84 8.775 G2IV 40 0
13 NGC 6121 35 RG* 16 23 24.0238740192 -26 30 00.551004264 15.17 14.128 12.776   11.162 ~ 14 0
14 Cl* NGC 6121 SAW V66 EB* 16 23 25.5423829536 -26 29 11.800992372 17.98 17.77 16.93 16.37 15.77 ~ 15 0
15 Cl* NGC 6121 SAW V6 RR* 16 23 25.7727023760 -26 26 16.409065056 14.41 14.08 13.45 13.00 12.50 hF2.5 21 0
16 Cl* NGC 6121 SAW V7 RR* 16 23 25.9326520704 -26 27 41.992981632 14.56 14.09 13.42 12.94 12.40 ~ 21 0
17 Cl* NGC 6121 SAW V8 RR* 16 23 26.1306045480 -26 29 41.746261200 13.96 13.98 13.32 12.85 12.33 hF6 18 0
18 Cl* NGC 6121 SAW V9 RR* 16 23 26.7749776200 -26 29 48.109879104 14.48 13.98 13.30 12.82 12.30 hF6.5 18 0
19 Cl* NGC 6121 SAW V10 RR* 16 23 29.1850701648 -26 28 54.380056584 14.66 13.95 13.33 12.88 12.38 hF5.5 20 0
20 Cl* NGC 6121 SAW V61 RR* 16 23 29.7334560240 -26 29 50.383344192 14.35 13.78 13.26 12.90 12.46 ~ 15 0
21 CD-26 11313 AB* 16 23 30.8920148160 -26 27 04.098919788   12.598 10.808   8.880 K2 38 0
22 Cl* NGC 6121 SAW V15 RR* 16 23 31.9470876936 -26 24 18.222455232 14.99 14.45 13.69 13.08 12.63 hF5.5 49 0
23 2MASS J16233236-2626205 RG* 16 23 32.3708260704 -26 26 20.601330540 15.23 14.364 13.061   11.489 ~ 15 0
24 [SBD2014] C5 V* 16 23 34.5811067328 -26 25 41.532557160 20.39 19.82 19.00 18.45 18.02 ~ 2 0
25 Cl* NGC 6121 SAW V19 RR* 16 23 35.0316611040 -26 25 36.490688508 14.26 14.01 13.38 12.92 12.38 hF4.5 23 0
26 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1778 0
27 [SBD2014] C3 V* 16 23 35.5705324176 -26 27 08.244461052 18.53 18.01 16.80 16.01 15.24 ~ 2 0
28 Cl* NGC 6121 SAW V47 * 16 23 37.34 -26 33 18.5           ~ 4 0
29 NGC 6121 370 RG* 16 23 38.8582043016 -26 25 42.784867632 15.26 14.362 13.071   11.528 ~ 18 0
30 Cl* NGC 6121 SAW V54 RG* 16 23 42.8012546448 -26 29 27.609257292 17.79 13.98 12.66 11.86 11.06 ~ 18 0
31 Cl* NGC 6121 ALC 318 RG* 16 23 43.0923509424 -26 28 07.468793256 15.50 14.75 13.548   12.047 ~ 13 0
32 Cl* NGC 6121 SAW V27 RR* 16 23 43.1526941376 -26 27 16.387433172 14.22 13.90 13.21 12.73 12.18 hF6 25 0
33 UCAC4 318-089393 V* 16 23 44.7715669160 -26 24 29.416357623 16.30 15.941 14.930 15.175 13.98 ~ 2 0
34 Cl* NGC 6121 SAW V55 V* 16 23 45.9165961344 -26 23 36.978663696 14.22 13.70 13.24   12.59 ~ 11 0
35 NGC 6121 78 RG* 16 23 47.8825228152 -26 29 48.285234744 15.50 14.783 13.575   12.106 ~ 18 0
36 [MPB2015] 54082 V* 16 23 48.9212951688 -26 23 52.017553572 17.05 16.66 15.60   14.25 ~ 4 0
37 V* V1331 Sco * 16 23 53.2151587200 -26 22 24.390090912   13.26 12.64     ~ 11 0
38 SV* R 372 RR* 16 23 53.5917856608 -26 30 05.357816136 14.07 13.79 13.19 12.75 12.23 ~ 24 0
39 Cl* NGC 6121 ALC 75 * 16 23 56.5172003592 -26 25 28.468943400   14.09 13.20     ~ 6 0
40 Cl* NGC 6121 SAW V29 RR* 16 23 58.2371252376 -26 21 35.139365604 14.20 13.90 13.28 12.83 12.31 hF4 33 0
41 Gaia DR3 6045489283174903168 RR? 16 23 59.3195015736 -26 27 15.492543192           ~ 2 0
42 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 348 1
43 NGC 6293 GlC 17 10 10.42 -26 34 54.2           ~ 262 0
44 [FLM96] M 92 C X 17 17 06.8 +43 08 24           ~ 7 0
45 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 299 0
46 NGC 6355 GlC 17 23 58.65 -26 21 12.3   12.46 11.05     ~ 142 0
47 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13328 0
48 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 780 1

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2022.12.06-07:57:55

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