2025A&A...695A..88G

Query : 2025A&A...695A..88G

2025A&A...695A..88G - Astronomy and Astrophysics, volume 695A88 (2025/3-1)

Give to Ursa Minor what is Ursa Minor's: An updated census of the RR Lyrae population in the Ursa Minor dwarf galaxy based on Gaia DR3.

GAROFALO A., CLEMENTINI G., CUSANO F., MURAVEVA T. and MONTI L.

Abstract (from CDS):

Aims. We used RR Lyrae stars identified by the Gaia third data release (DR3) to explore the outskirts of the Ursa Minor (UMi) dwarf spheroidal galaxy (dSph) and update the census of its variable star population.
Methods. We adopted different tools based on the Gaia DR3 astrometric and photometric data (proper motions, Period-Wesenheit-Metallicity relations, spatial distribution, colour-magnitude diagram and stellar isochrone fitting) to discriminate between different types of variable stars, and to identify UMi members.
Results. We found a total of 129 RR Lyrae stars and 10 Anomalous Cepheids (ACs) that belong to UMi. In this paper we report 47 new RR Lyrae stars (46 bona fide and 1 candidate) and 5 new ACs (4 bona fide and 1 candidate), including new possible members in the extreme periphery of the galaxy at a distance of ∼12 half-light radii. We reclassified 13 RR Lyrae stars identified by the Gaia DR3 Specific Object Study pipeline for Cepheids and RR Lyrae stars (SOS Cep&RRL), using data from the literature and Gaia astrometry and photometry. Specifically, we assigned these 13 DR3 RR Lyrae stars to ten Anomalous Cepheids and three doublemode RR Lyrae (RRd), respectively. From the average luminosity of the RR Lyrae stars we derive for UMi a distance modulus of (m - M)0 = 19.23 ± 0.11 mag, in excellent agreement with the literature. Finally, we investigated whether some of UMi's variable stars might be members of the ultra-faint stellar cluster Muñoz 1 that lies at a projected distance of 45' from UMi's centre. Based on the properties of the variable stars (distances, colours, and metallicities), we find it unlikely that they belong to the cluster.

Abstract Copyright: © The Authors 2025

Journal keyword(s): stars: Population II - pulsars: general - stars: variables: RR Lyrae - Galaxy: halo - galaxies: dwarf

Nomenclature: [GCC2025] VNNN N=57 among (Nos V102-V178). [GCC2025] A (Nos A-I).

Simbad objects: 149

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Number of rows : 149
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 Gaia DR3 1669496020369252864 RR* 14 44 59.3366239531 +66 40 14.485563333           ~ 2 0
2 Gaia DR3 1693449426640926208 RR* 14 55 14.5699076088 +67 16 57.924658344           ~ 3 0
3 [SHM2017] J224.07641+64.64804 RR* 14 56 18.3684289632 +64 38 52.869660936           ~ 8 0
4 GALEX J145758.3+685222 Q? 14 57 58.4069232616 +68 52 21.468200543           ~ 1 1
5 [SHM2017] J225.02335+67.60332 RR* 15 00 05.5657886616 +67 36 11.934027324           ~ 7 0
6 [SHM2017] J225.24305+66.36102 RR* 15 00 58.3090976664 +66 21 39.618858420           ~ 7 0
7 [SHM2017] J225.81424+66.88304 RR* 15 03 15.4284446040 +66 52 58.975279392           ~ 8 0
8 Gaia DR3 1693416097694750080 RR* 15 03 20.0817369365 +67 19 13.497675315           ~ 2 0
9 Gaia DR3 1645350053535689344 RR* 15 03 29.7617777832 +66 48 25.501263840           ~ 4 0
10 [SHM2017] J225.92451+67.21129 RR* 15 03 41.8488304128 +67 12 40.668762384           ~ 10 0
11 ZTF J150343.92+675645.3 RR* 15 03 43.9285378311 +67 56 45.223073964           ~ 6 0
12 ZTF J150357.99+671216.8 RR* 15 03 57.9899591232 +67 12 16.700641020           ~ 7 0
13 ZTF J150408.48+670536.1 RR* 15 04 08.4880830474 +67 05 36.114567149           ~ 4 0
14 [SHM2017] J226.16940+66.77595 RR* 15 04 40.6487769696 +66 46 33.434927652           ~ 8 0
15 [SHM2017] J226.24367+66.68449 RR* 15 04 58.5086610648 +66 41 04.198150788           ~ 9 0
16 Gaia DR2 1693632156025631872 Ce* 15 05 01.5483004248 +68 32 01.818356640           ~ 5 0
17 [NWM88] V 76 RR* 15 05 16.0047035016 +66 55 25.169227140           ~ 10 0
18 [SHM2017] J226.42650+66.53939 RR* 15 05 42.3538126968 +66 32 21.939248004           ~ 9 0
19 ZTF J150545.58+670742.5 RR* 15 05 45.5805581832 +67 07 42.302304948           ~ 8 0
20 [SHM2017] J226.46438+67.78852 RR* 15 05 51.4547848872 +67 47 18.696977016           ~ 5 0
21 [NWM88] V 75 RR* 15 05 59.4250893384 +67 00 44.089341552     19.20     ~ 6 0
22 [NWM88] V 92 RR* 15 06 12.6829963800 +67 03 57.836892492     19.90     ~ 6 0
23 [NWM88] V 62 Ce* 15 06 22.7365030287 +67 09 59.987122347     18.40     ~ 7 0
24 [NWM88] V 63 RR* 15 06 25.1224055544 +67 08 52.631003148     19.90     ~ 5 0
25 Gaia DR3 1645341841556102400 RR* 15 06 35.6720180448 +66 51 55.976580252           ~ 3 0
26 [NWM88] V 99 RR* 15 06 37.2230332784 +67 14 14.410780354     19.40     ~ 5 0
27 [NWM88] V 93 RR* 15 06 38.2466881296 +66 50 09.860845452     19.40     ~ 8 0
28 Gaia DR3 1645455267348204928 RR* 15 06 41.9285816880 +67 12 01.943362188           ~ 4 0
29 [NWM88] V 70 RR* 15 06 47.9988767424 +67 05 45.376212192     19.30     ~ 8 0
30 [SHM2017] J226.70292+67.75597 RR* 15 06 48.6406281528 +67 45 21.529630188           ~ 8 0
31 [NWM88] V 77 RR* 15 06 53.1023281080 +67 16 55.025108040     19.855   19.183 ~ 9 0
32 [NWM88] V 71 RR* 15 06 54.5035298538 +67 04 01.143261086     19.470   18.888 ~ 5 0
33 ZTF J150655.65+675253.3 RR* 15 06 55.6707913752 +67 52 53.287898160           ~ 6 0
34 [S96d] 916 Ce* 15 06 56.5067959824 +67 02 37.242314520   19.53 19.34     ~ 5 0
35 [NWM88] V 61 RR* 15 07 08.3504410248 +67 09 34.656180408     19.584   19.217 ~ 6 0
36 [SHM2017] J226.80132+67.24827 RR* 15 07 12.2874973320 +67 14 53.620553868           ~ 7 0
37 [NWM88] V 74 V* 15 07 14.3191199592 +66 56 48.282272520     19.60     ~ 4 0
38 [SHM2017] J226.86664+70.02958 RR* 15 07 28.0384315464 +70 01 46.526215116           ~ 9 0
39 [NWM88] V 73 RR* 15 07 32.6224594032 +66 57 44.610968988     19.40     ~ 9 0
40 [NWM88] V 64 RR* 15 07 47.5254328488 +67 07 52.473712368     19.925   19.226 ~ 11 0
41 [SHM2017] J226.94991+67.94321 RR* 15 07 47.9583507336 +67 56 35.451836412           ~ 7 0
42 [NWM88] V 34 RR* 15 07 48.4118126328 +67 18 53.266742604     19.50     ~ 7 0
43 [NWM88] V 60 RR* 15 07 50.5480079040 +67 09 27.165624948     19.521   19.085 ~ 9 0
44 [NWM88] V 36 RR* 15 07 56.6112222048 +67 15 01.269800244     19.952   19.271 ~ 12 0
45 ZTF J150757.39+670308.1 RR* 15 07 57.3869484432 +67 03 08.047228932           ~ 5 0
46 [NWM88] V 68 RR* 15 08 00.3198423792 +67 03 40.517353512     19.601   19.014 ~ 9 0
47 [NWM88] V 84 RR* 15 08 02.8450963080 +67 11 21.666103980     19.901   19.275 ~ 7 0
48 [NWM88] V 35 RR* 15 08 07.9355807640 +67 17 00.684800988     19.862   19.215 ~ 12 0
49 [NWM88] V 33 RR* 15 08 10.4711598936 +67 18 58.973878836     19.944   19.375 ~ 8 0
50 [NWM88] V 88 RR* 15 08 11.0441950392 +67 05 26.880756252     19.965   19.721 ~ 5 0
51 [NWM88] V 83 RR* 15 08 13.4516460792 +67 09 06.353165304     19.532   19.074 ~ 8 0
52 [NWM88] V 69 RR* 15 08 14.9048714064 +67 01 37.600069836     19.855   19.354 ~ 9 0
53 [NWM88] V 95 RR* 15 08 15.3630538320 +67 09 05.270659668     19.657   19.276 ~ 4 0
54 [NWM88] V 50 RR* 15 08 15.5562172608 +67 12 31.977731016     19.768   19.096 ~ 12 0
55 [SHM2017] J227.07847+67.59028 RR* 15 08 18.8331470712 +67 35 25.011750696           ~ 7 0
56 [NWM88] V 67 RR* 15 08 22.8537286776 +67 02 01.361035968     19.475   18.873 ~ 9 0
57 Gaia DR3 1645464093505514752 RR* 15 08 23.5784336177 +67 23 08.735011009           ~ 3 0
58 [NWM88] V 59 RR* 15 08 25.4043434760 +67 09 29.625146532   19.8 19.600 18.9 18.983 ~ 13 0
59 [NWM88] V 58 RR* 15 08 27.4619000568 +67 09 23.940384876     19.503   19.110 ~ 9 0
60 [NWM88] V 57 RR* 15 08 28.9475601240 +67 10 21.683082324     19.803   19.410 ~ 6 0
61 [NWM88] V 98 RR* 15 08 32.1490049520 +67 05 31.269515280     19.744   19.266 ~ 7 0
62 [NWM88] V 55 RR* 15 08 32.8718913216 +67 10 18.809140656     19.835   19.152 ~ 8 0
63 [NWM88] V 27 RR* 15 08 37.1672378280 +67 20 41.667063576     19.941   19.230 ~ 8 0
64 [NWM88] V 100 RR* 15 08 42.5590097490 +67 33 28.723073059     19.50     ~ 7 0
65 [NWM88] V 48 RR* 15 08 43.7119175856 +67 13 06.726973008     19.419   18.883 ~ 11 0
66 ZTF J150843.88+663557.8 RR* 15 08 43.8920243352 +66 35 57.821725860           ~ 5 0
67 [NWM88] V 97 RR* 15 08 44.9590155048 +67 10 04.950292296     19.877   19.174 ~ 5 0
68 [NWM88] V 49 RR* 15 08 44.9864899776 +67 12 43.847245944     19.957   19.324 ~ 8 0
69 [SHM2017] J227.19751+67.41259 RR* 15 08 47.3884450488 +67 24 45.358057476           ~ 4 0
70 [NWM88] V 54 RR* 15 08 49.4928929520 +67 06 04.650156864     19.601   18.951 ~ 11 0
71 [NWM88] V 25 RR* 15 08 53.3184246312 +67 20 20.142258684     19.882   19.201 ~ 8 0
72 [NWM88] V 94 V* 15 08 57.9763415880 +67 03 28.545990228     19.912   19.384 ~ 4 0
73 [NWM88] V 26 RR* 15 09 02.4394830360 +67 19 18.185855880     20.205   19.512 ~ 8 0
74 [NWM88] V 72 RR* 15 09 02.7261218784 +66 57 25.032112236     20.20     ~ 9 0
75 [NWM88] V 56 RR* 15 09 03.1166502048 +67 10 08.870784636     18.903   18.572 ~ 11 0
76 [NWM88] V 47 RR* 15 09 07.7161286520 +67 11 43.417213296     19.654   19.078 ~ 8 0
77 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
78 [NWM88] V 53 RR* 15 09 08.3879673456 +67 06 31.170454668     19.947   19.232 ~ 12 0
79 [NWM88] V 8 RR* 15 09 10.4949174192 +67 27 06.081608520     19.10     ~ 9 0
80 [NWM88] V 78 RR* 15 09 10.6374708360 +67 22 52.594518324     19.625   19.152 ~ 6 0
81 [NWM88] V 32 RR* 15 09 16.6031189040 +67 17 37.936623660     19.60     ~ 10 0
82 [NWM88] V 40 RR* 15 09 18.3113754648 +67 14 10.380572556     19.899   19.487 ~ 9 0
83 [NWM88] V 38 RR* 15 09 21.2382309552 +67 16 21.120462588     19.915   19.495 ~ 9 0
84 [NWM88] V 52 RR* 15 09 24.0428956896 +67 06 03.602348388     19.646   19.003 ~ 12 0
85 [NWM88] V 45 RR* 15 09 25.6570916664 +67 12 13.529555100     20.229   19.590 ~ 11 0
86 [NWM88] V 21 RR* 15 09 28.2731254728 +67 20 55.788889452     20.005   19.333 ~ 10 0
87 [NWM88] V 79 RR* 15 09 32.1955862256 +67 19 43.321993068     19.970   19.402 ~ 7 0
88 [SHM2017] J227.39195+67.90608 RR* 15 09 34.0513143360 +67 54 21.951160704           ~ 6 0
89 [NWM88] V 66 RR* 15 09 36.8182558776 +67 01 30.056218212     19.787   19.104 ~ 11 0
90 [NWM88] V 80 Ce* 15 09 40.6044377376 +67 19 28.529743872     18.760   18.126 ~ 7 0
91 [NWM88] V 39 RR* 15 09 42.6523494984 +67 14 50.741723184     19.882   19.310 ~ 10 0
92 [SHM2017] J227.44851+67.80189 RR* 15 09 47.5938570000 +67 48 06.862378356           ~ 9 0
93 [NWM88] V 7 RR* 15 09 47.7891409968 +67 27 16.235728560     19.20     ~ 6 0
94 [NWM88] V 20 RR* 15 09 47.9849795448 +67 21 29.378236068     19.714   19.127 ~ 7 0
95 [NWM88] V 22 RR* 15 09 49.9933912104 +67 20 03.088891392     20.137   19.632 ~ 7 0
96 [NWM88] V 41 RR* 15 09 51.6074789400 +67 13 54.729267636     19.10     ~ 10 0
97 [NWM88] V 13 RR* 15 09 52.2803283313 +67 24 11.362770424     19.20     ~ 6 0
98 [NWM88] V 81 RR* 15 09 54.7906027584 +67 06 44.863517700     19.778   19.234 ~ 9 0
99 [NWM88] V 5 RR* 15 09 55.5965444175 +67 28 30.752021013     19.70     ~ 4 0
100 [NWM88] V 44 RR* 15 09 56.3867582184 +67 10 03.791790660     19.560   19.159 ~ 9 0
101 [NWM88] V 6 Ce* 15 09 57.9917718840 +67 27 53.392010616     17.90     ~ 9 0
102 [NWM88] V 43 RR* 15 09 58.4347353432 +67 11 14.620401096     19.479   18.940 ~ 9 0
103 [NWM88] V 31 RR* 15 09 59.3539390968 +67 17 16.367429292     19.672   19.258 ~ 9 0
104 [NWM88] V 37 RR* 15 10 06.1889955552 +67 14 53.576446128     20.040   19.363 ~ 10 0
105 [NWM88] V 101 RR* 15 10 07.9899018912 +67 34 21.514235844     19.30     ~ 11 0
106 [NWM88] V 9 RR* 15 10 08.1838913384 +67 25 10.139618242     19.850   19.352 ~ 4 0
107 [NWM88] V 19 RR* 15 10 09.4637819904 +67 21 27.719969904     19.594   19.224 ~ 8 0
108 [NWM88] V 24 RR* 15 10 10.0515389208 +67 18 38.421602208     19.694   19.339 ~ 11 0
109 [NWM88] V 23 RR* 15 10 19.3284711024 +67 19 24.981108636     19.828   19.107 ~ 8 0
110 [NWM88] V 51 RR* 15 10 19.7308823184 +67 05 14.230344588     19.618   19.014 ~ 12 0
111 ZTF J151020.23+665949.3 RR* 15 10 20.2303877640 +66 59 49.303505904           ~ 6 0
112 [NWM88] V 10 RR* 15 10 20.5802576592 +67 24 18.277424532     20.097   19.397 ~ 10 0
113 [NWM88] V 42 RR* 15 10 22.8290013624 +67 12 34.303242060     19.779   19.158 ~ 12 0
114 [NWM88] V 30 RR* 15 10 23.0004058776 +67 16 08.872786308     19.665   19.296 ~ 10 0
115 ZTF J151023.44+675140.3 RR* 15 10 23.4422841216 +67 51 40.316959764           ~ 6 0
116 [NWM88] V 82 RR* 15 10 26.4209939640 +67 07 28.404745356     19.744   19.199 ~ 11 0
117 [NWM88] V 14 V* 15 10 28.1902403448 +67 23 03.132860928     20.066   19.135 ~ 4 0
118 [NWM88] V 29 RR* 15 10 29.9047342200 +67 15 09.870715908     20.004   19.409 ~ 10 0
119 [NWM88] V 12 RR* 15 10 32.3799162576 +67 23 44.129734512     19.879   19.204 ~ 5 0
120 [NWM88] V 11 Ce* 15 10 33.6876128280 +67 25 02.519878116     19.143   18.551 ~ 8 0
121 [SHM2017] J227.65128+66.90656 RR* 15 10 36.3072803928 +66 54 23.535229104           ~ 8 0
122 [NWM88] V 28 RR* 15 10 41.7225198864 +67 16 41.774092104     19.938   19.432 ~ 11 0
123 ZTF J151111.36+670944.6 RR* 15 11 11.3721452832 +67 09 44.601670872           ~ 6 0
124 [NWM88] V 17 RR* 15 11 19.4474456534 +67 21 42.748920048     19.40     ~ 5 0
125 [NWM88] V 15 RR* 15 11 29.2476603792 +67 22 05.572767972     19.20     ~ 8 0
126 [NWM88] V 4 RR* 15 11 31.5544842888 +67 25 34.707585432     19.80     ~ 7 0
127 [NWM88] V 16 RR* 15 11 49.5912113496 +67 21 13.661105400     19.80     ~ 8 0
128 [NWM88] V 3 RR* 15 11 50.4139929984 +67 26 06.817675740     19.80     ~ 6 0
129 [NWM88] V 1 RR* 15 11 53.0719257203 +67 35 40.923974341     19.10     ~ 10 0
130 ZTF J151159.22+671432.2 RR* 15 11 59.2297537272 +67 14 32.182082016           ~ 8 0
131 [SHM2017] J228.00298+67.16462 RR* 15 12 00.6883673424 +67 09 52.579307016           ~ 9 0
132 ZTF J151209.49+670749.6 RR* 15 12 09.4990032384 +67 07 49.542060900           ~ 6 0
133 [PKK2020] 592 RR* 15 12 23.3738282958 +67 25 11.013296613           ~ 3 0
134 [NWM88] V 18 RR* 15 12 26.3448024336 +67 19 06.883729644     19.20     ~ 9 0
135 [NWM88] V 2 RR* 15 12 40.2835469328 +67 31 17.782149108     19.50     ~ 11 0
136 ZTF J151254.82+670048.4 RR* 15 12 54.8190448896 +67 00 48.456857628           ~ 6 0
137 [SHM2017] J228.23616+67.99711 RR* 15 12 56.6546596152 +67 59 49.601288904           ~ 9 0
138 ZTF J151307.22+665740.0 RR* 15 13 07.2122985553 +66 57 39.970965256           ~ 5 0
139 ZTF J151325.07+674429.0 RR* 15 13 25.0809542616 +67 44 28.950773928           ~ 7 0
140 Gaia DR3 1645428501111989376 RR* 15 14 17.7079948272 +67 20 35.762192304           ~ 4 0
141 ZTF J151607.50+674721.5 RR* 15 16 07.5011878968 +67 47 21.405093252           ~ 7 0
142 Gaia DR3 1644108979783405056 RR* 15 16 21.1050927960 +64 33 27.792434916           ~ 5 0
143 ZTF J151637.46+671148.4 RR* 15 16 37.4723555520 +67 11 48.277917852           ~ 8 0
144 ZTF J151747.76+674437.8 RR* 15 17 47.7694089624 +67 44 37.744258056           ~ 6 0
145 [SHM2017] J229.70915+67.42149 RR* 15 18 50.2324633608 +67 25 17.378361876           ~ 6 0
146 ZTF J152529.04+642714.3 Ce* 15 25 29.0526420480 +64 27 14.235301008           ~ 6 0
147 Gaia DR3 1646045808171028352 RR* 15 26 05.1299034744 +69 07 25.425434172           ~ 4 0
148 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
149 NAME Local Group GrG ~ ~           ~ 9325 0

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