2020MNRAS.497.2562C

Query : 2020MNRAS.497.2562C

2020MNRAS.497.2562C - Mon. Not. R. Astron. Soc., 497, 2562-2568 (2020/September-3)

Fast-rotating giant stars behind the Coma Berenices star cluster.

CASAL E., FERNANDEZ M., ALFARO E.J., CASANOVA V. and TOBARUELA A.

Abstract (from CDS):

In the frame of a study of the empirical isochrones of young stellar clusters, we have carried out BVIc Johnson-Cousins photometry of a sample of K and M stars of the Coma Berenices star cluster. All these stars have known rotational periods. Our main goal is to get a valuable reference on the colour-magnitude diagram, Mv versus B - V, for stars with ages within 400-800 Myr. For this purpose, we obtained BVIc photometry with an average upper limit for the precision of about 0.025 mag and used parallaxes from the Gaia Data Release 2. We found that one-third of our sample is located well above the cluster main sequence and these stars are confirmed as background giants by their radial velocities in the Gaia Data Release 2. This misclassification shows that giants with short-surface rotational periods can mimic main-sequence stars if they are located at the appropriate distance. We recommend caution when using rotational periods in order to determine cluster membership. Besides, the gyrochronology technique should be used only when the luminosity class of the stars is well known. Finally, our cleared sample supports an age of ∼600 Myr for Coma Berenices, rather than an age of ∼800 Myr.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Stars: low-mass - Stars: rotation - Galaxy: open clusters and associations: Coma Berenices

Simbad objects: 46

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Number of rows : 46
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 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
2 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
3 SA 98- reg 06 52 04.1 -00 23 58           ~ 179 0
4 SA 101- reg 09 57 28.2 -00 19 39           ~ 74 0
5 BD+29 2215 * 11 48 37.6996662552 +28 16 30.534011652   11.15 10.38     G7 34 0
6 BSD 56-609 Em* 11 55 33.3657114936 +29 43 41.722150656   12.35 11.42     K0 10 0
7 BSD 56-15 SB* 12 00 52.2439524600 +27 19 23.735766108   12.40 11.51     G9 6 0
8 TYC 1986-1688-1 Em* 12 02 22.8791 +22 54 58.808   12.72 12.22     G9 2 0
9 NGP 26 45 SB* 12 07 57.7159142784 +25 35 11.387609592   12.05 11.06     K3.1 22 0
10 2MASS J12083610+3106098 Em* 12 08 36.1000022184 +31 06 09.759901140           K8.6 18 0
11 BSD 56-594 Em* 12 11 35.1618107808 +29 22 44.505753600   12.44 11.21     K2.8 29 0
12 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
13 NGP 27 64 * 12 12 53.2353476736 +26 15 01.429093404   12.93 11.40 10.54 9.72 K2.2 37 0
14 Cl Melotte 111 282 Em* 12 21 15.6150145776 +26 09 14.046253164   12.50 11.5 10.87 10.41 K3.5 46 0
15 Cl* Melotte 111 AV 1404 * 12 23 47.2153555680 +23 14 44.501946000   12.90 11.21 11.30 9.54 ~ 23 0
16 BD+26 2342 Em* 12 24 05.7338390664 +26 07 42.918489804   11.26 10.46     G8.1 62 0
17 BD+35 2338 cC* 12 26 01.3263602544 +34 21 08.416267740   12.85 11.98 11.35   G8 11 0
18 * 14 Com * 12 26 24.0644226936 +27 16 05.659806648 5.40 5.22 4.95 4.70 4.55 F1IV:npS_sh 167 0
19 [M60b]+26 215 Em* 12 26 51.0269019288 +26 16 01.799963436   12.83 11.73 11.07 10.56 K4.8 42 0
20 UCAC4 564-049450 * 12 26 56.4694982064 +22 40 54.441906780   16.59 15.16 14.74   ~ 1 0
21 * 16 Com * 12 26 59.2962947904 +26 49 32.526134544   5.045 4.959   4.93 A4V 169 0
22 BD+24 2462 * 12 27 20.6893226712 +23 19 47.455378752   11.12 10.32 9.83 9.46 G7.9 39 0
23 BD+29 2290 * 12 27 48.2946577200 +28 11 39.891263784   10.40 9.6     G5.4 40 0
24 BD+27 2139 Em* 12 28 56.4263196744 +26 32 57.395882868   11.67 10.8 10.53 10.25 K5.3 55 0
25 * 18 Com * 12 29 27.0424033224 +24 06 32.122207044   5.898 5.468     F5IV 135 1
26 [M60b]+29 227 * 12 29 42.1589539752 +28 37 14.822980320   12.08 11.32     K2.5 6 0
27 BD+23 2472 * 12 33 20.0126443344 +22 24 23.490830340   11.05 10.32     G7.8 22 0
28 [M60b]+29 265 * 12 33 41.8818379968 +29 14 01.755272724   12.63 11.58     K4 8 0
29 BD+26 2362 SB* 12 33 42.1222320312 +25 56 33.960999876   11.40 10.59 9.9   G8.0 30 0
30 [M60b]+27 297 * 12 33 54.2156059608 +27 08 04.810848432   12.63 11.80     K3.3 10 0
31 2MASS J12381145+2333223 * 12 38 11.4552821136 +23 33 22.127034852           K9.5 15 0
32 TYC 1448-1907-1 * 12 39 42.0029668296 +21 34 57.940453128   12.85 11.89     ~ 1 0
33 SA 32- reg 12 40 +13.1           ~ 4 0
34 SA 104- reg 12 42 21.0 -00 32 29           ~ 58 0
35 NGP 41 134 * 12 42 35.1175251912 +41 05 27.641130900     11.7     K0 8 0
36 UCAC4 574-048029 * 12 43 09.5282198448 +24 47 05.176634748   15.34 13.90 13.48   ~ 1 0
37 UCAC4 665-058027 * 12 45 23.3424326232 +42 51 04.330593936   15.76 14.36 13.86   ~ 4 0
38 NGP 26 151 SB* 12 49 00.4189982712 +25 21 35.567280072   13.203 12.012 11.675   K5 14 0
39 NGP 26 152 * 12 49 30.4373650584 +25 32 11.110952508   12.54 11.44 10.9   K0 8 0
40 TYC 1455-404-1 * 12 50 01.7068890360 +21 03 12.292630992   12.29 11.16     ~ 1 0
41 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
42 UCAC4 571-050551 * 12 53 14.6568993000 +24 03 13.438942056   13.48 12.38 11.85   ~ 1 0
43 BD+29 2346 Em* 12 57 36.8658151800 +28 58 44.733236304   11.07 10.36     G4 27 0
44 TYC 1453-371-1 SB* 12 59 27.7561405128 +19 41 15.057609864   13.25 12.11     ~ 2 0
45 TYC 1456-1-1 * 13 05 43.9979990184 +20 03 21.449506932   12.31 11.03     ~ 1 0
46 SA 109- reg 17 45.1 -00 13           ~ 14 0

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