2021A&A...656A.149A


Query : 2021A&A...656A.149A

2021A&A...656A.149A - Astronomy and Astrophysics, volume 656A, 149-149 (2021/12-1)

Stellar Population Astrophysics (SPA) with the TNG. Stock 2, a little-studied open cluster with an eMSTO.

ALONSO-SANTIAGO J., FRASCA A., CATANZARO G., BRAGAGLIA A., ANDREUZZI G., CARRERA R., CARRETTA E., CASALI G., D'ORAZI V., FU X., GIARRUSSO M., LUCATELLO S., MAGRINI L., ORIGLIA L., SPINA L., VALLENARI A. and ZHANG R.

Abstract (from CDS):

Stock 2 is a little-studied open cluster that shows an extended main-sequence turnoff (eMSTO). In order to investigate this phenomenon and characterise the cluster itself, we performed high-resolution spectroscopy in the framework of the Stellar Population Astrophysics project. We employed the High Accuracy Radial velocity Planet Searcher in the Northern hemisphere spectrograph at the Telescopio Nazionale Galileo (TNG). We completed our observations with additional spectra taken with the Catania Astrophysical Observatory Spectropolarimeter. We observed 46 stars (dwarfs and giants). They represent by far the largest sample collected for this cluster to date. We provide the stellar parameters, the extinction, and the radial and projected rotational velocities for most of the stars. Chemical abundances for 21 species with atomic numbers up to 56 have also been derived. We note a differential reddening in the cluster field with an average value of 0.27 mag. This appears the main cause for the observed eMSTO because it cannot be explained as the result of different rotational velocities, as found in other clusters. We estimate an age for Stock 2 of 450 ± 150 Ma, which corresponds to a MSTO stellar mass of ≃2.8 M. The cluster mean radial velocity is about 8.0 km s–1. We find a solar-like metallicity for the cluster, [Fe/H] = -0.07 ± 0.06, compatible with its galactocentric distance. The chemical abundances of main-sequence stars and giants are compatible within the errors. The exceptions are barium and strontium, which are clearly overabundant in giants, and cobalt, which is only marginally overabundant. Finally, the chemical composition of Stock 2 is fully compatible with the composition observed in other open clusters of the Galactic thin-disc population.

Abstract Copyright: © ESO 2021

Journal keyword(s): open clusters and associations: individual: Stock 2 - Hertzsprung-Russell and C-M diagrams - stars: abundances - stars: fundamental parameters

Simbad objects: 55

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Number of rows : 55
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 HD 12184 * 02 01 32.0021296560 +59 48 11.238654528   8.49 8.30     A2V 22 0
2 HD 12650 * 02 05 58.5184867656 +60 16 42.116856780   9.71 8.37     G2II 25 0
3 HD 12920 * 02 08 31.5484745928 +59 58 06.116755872   9.79 9.48     A1V 14 0
4 HD 13100 * 02 10 10.5920902824 +59 32 33.097047000   10.25 10.01     A0V 15 0
5 HD 13134 * 02 10 39.7445387352 +60 04 43.473387756   10.08 8.95     G5III 15 0
6 HD 13207 * 02 11 11.6317387512 +59 58 51.288774816   9.41 8.21     G8III 18 0
7 TYC 3697-1499-1 * 02 12 37.2102576576 +59 50 43.056408012   13.01 12.68     ~ 9 0
8 UCAC4 749-021692 * 02 13 10.9968388512 +59 45 19.207928808   13.966 13.075 12.909   ~ 5 0
9 Cl Stock 2 37 * 02 13 19.7344629936 +59 54 12.189784320   11.96 11.34     A2 10 0
10 HD 13437 * 02 13 28.7858368200 +59 11 45.593710080   8.78 7.61     G5II 37 0
11 UCAC4 748-021817 * 02 13 44.6746913688 +59 33 03.961459512   13.000 12.078 11.868   ~ 5 0
12 UCAC4 747-020812 * 02 13 46.5085013808 +59 23 56.838641388   12.468 11.793 11.682   ~ 4 0
13 HD 13518 * 02 14 00.8312049336 +59 24 05.574151368   8.91 8.56     A1V 24 0
14 HD 13591 * 02 14 42.2109376344 +59 23 40.925596920   9.05 8.65     A1IV 29 0
15 HD 13606 * 02 14 52.6494405240 +59 38 36.954992760   9.43 9.02     A0V 24 0
16 TYC 3698-2739-1 * 02 15 02.6822555472 +59 05 58.690845168   11.14 10.64     A0 10 0
17 HD 13655 * 02 15 16.7112713592 +59 20 05.817634116   10.18 8.85     G5III 15 0
18 TYC 3698-1703-1 * 02 15 18.8470096872 +59 39 27.749054376   12.13 11.42     B8V 9 0
19 Cl Stock 2 OpC 02 15 25 +59 31.3           ~ 114 0
20 HD 13688 * 02 15 31.7340668712 +59 23 05.709107076   9.13 8.75     A0IV 21 0
21 HD 13699 * 02 15 38.2166016504 +59 05 29.659954560   10.05 9.53     A0V 15 0
22 TYC 3698-2224-1 * 02 15 53.8419060408 +58 48 11.250114084   11.70 11.23     ~ 8 0
23 BD+58 423 * 02 16 13.1019954720 +59 38 49.825904136   10.65 10.27     A0 13 0
24 Cl Stock 2 121 * 02 16 21.2324075880 +59 03 17.974130184   11.5 10.9     A3 11 0
25 2MASS J02162746+5954309 * 02 16 27.4651667760 +59 54 30.978482328   13.57       ~ 6 0
26 BD+58 426 * 02 16 37.1816079408 +59 17 40.582459320   10.56 10.00     A0 11 0
27 HD 13899 * 02 17 28.3314324936 +59 22 00.576388200   9.06 8.76     A0V 25 0
28 HD 13909 * 02 17 35.0060959344 +59 32 09.399221592   8.99 8.68     A0IV 28 0
29 HD 13967 * 02 17 55.9484499216 +58 54 17.504780544   10.21 9.93     A1V 12 0
30 HD 14025 * 02 18 22.7931895200 +59 22 33.607332984   8.79 8.50     A1V 23 0
31 NGC 869 OpC 02 18 58 +57 08.0           ~ 463 0
32 UCAC4 748-022595 * 02 19 21.7289193720 +59 27 30.417061212   13.346 12.650 12.552   ~ 5 0
33 HD 14161 * 02 19 34.9883228088 +59 18 29.658350880   8.51 8.26     A2IV 33 0
34 HD 14183 * 02 19 52.4812263792 +59 31 39.955464840   8.37 8.20     A1V 30 0
35 BD+59 469 * 02 20 15.4676154288 +59 52 34.456998972   10.33 10.02     A1V 11 0
36 TYC 3698-483-1 * 02 20 16.9513142016 +59 26 47.567584536   13.24 11.63     ~ 7 0
37 UCAC4 747-021730 * 02 20 40.3245068832 +59 23 20.478299172   13.985 13.204 13.118   ~ 5 0
38 HD 14346 SB* 02 21 15.4828396944 +59 14 52.478132676   8.68 7.46     K0II 41 0
39 TYC 3698-2381-1 * 02 21 33.9214161288 +59 07 10.758476460   11.05 10.49     A3 12 0
40 HD 14403 V* 02 21 38.1755390712 +58 47 03.075684360   9.25 8.16     G8III 14 0
41 HD 14415 SB* 02 21 45.9181468728 +58 34 24.223872648   9.34 8.32     G5II 18 0
42 NGC 884 OpC 02 22 20 +57 08.9           ~ 477 0
43 HD 14579 SB* 02 23 36.6725165904 +59 55 16.085437032   9.10 8.67     A3V 21 0
44 HD 14946 * 02 26 52.7527779696 +59 06 58.819593204   8.84 8.63     A1V 16 0
45 HD 15240 * 02 29 21.5692425264 +57 05 23.587090368   8.76 8.59     A0V 12 0
46 HD 15315 * 02 30 08.7909173400 +58 38 35.292098580   8.91 8.72     A0V 17 0
47 HD 15498 * 02 31 50.6951269488 +57 31 48.609952464   8.40 7.09     K1III 14 0
48 TYC 3699-1132-1 * 02 33 05.2750009368 +58 48 56.876331780   11.24 10.82     ~ 7 0
49 HD 15665 * 02 33 40.2681815040 +60 17 26.679605892   9.55 8.37     G8III 12 0
50 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6555 1
51 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3279 0
52 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2928 0
53 IC 2602 OpC 10 42 27 -64 25.6           ~ 640 0
54 NGC 6475 OpC 17 53 47 -34 50.5           ~ 365 0
55 NAME Ori Arm PoG ~ ~           ~ 196 0

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2023.01.30-22:47:37

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