2000A&A...363..958G


Query : 2000A&A...363..958G

2000A&A...363..958G - Astronomy and Astrophysics, volume 363, 958-969 (2000/11-3)

Optical follow-up of ROSAT discovered candidate members of the open cluster Coma Berenices.

GARCIA LOPEZ R.J., RANDICH S., ZAPATERO OSORIO M.R. and PALLAVICINI R.

Abstract (from CDS):

We have carried out an optical follow-up of twelve ROSAT discovered candidate members of the Coma Berenices open cluster. VRI photometry and low resolution (∼3Å) spectroscopy in the range 3800-7000Å were performed to obtain colour-magnitude diagrams, proper motions, spectral types, chromospheric activity levels and radial velocities that allow us to establish whether or not these candidates are reliable cluster members. Only four of these objects show optical photometry marginally compatible with the main sequence delineated by known cluster stars. They also exhibit spectral types corresponding to late-K and early-M, and radial velocities which are not inconsistent with membership in Coma Berenices. The proper motions of these candidates are, however, very high and incompatible with the small value associated with the cluster. Thus, none of the ROSAT candidates can be considered members of Coma Berenices. This result tends to favour the hypothesis that the mass of the cluster and its average mass density are lower than what is required for stability, allowing the cluster dissolution by the escape of the less massive stars. We discuss the probable nature of these objects on the basis of the available information. From our radial velocity observations we infer that five of them could be formed by multiple stars. In particular, we have discovered one W-type W UMa contact binary system (K6 spectral type) which is, in addition, a visual companion to a cooler star.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: binaries: eclipsing - stars: fundamental parameters - stars: late-type - Galaxy: open clusters and associations: individual: Coma Berenices - X-rays: stars

Nomenclature: Table 1: Cl* Melotte 111 GRZ NNa (Nos 1a, 2a, 3-12).

Simbad objects: 42

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Number of rows : 42
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * 54 Psc PM* 00 39 21.8053928046 +21 15 01.712899720 7.29 6.71 5.88 5.21 4.82 K0.5V 548 1
2 HD 4628 PM* 00 48 22.9759750919 +05 16 50.209484954 7.22 6.64 5.74 4.99 4.52 K2.5V 471 0
3 * 107 Psc PM* 01 42 29.7625251280 +20 16 06.645657710 6.57 6.08 5.24 4.55 4.12 K1V 527 0
4 HD 16160 PM* 02 36 04.9013368983 +06 53 12.383654295   6.81   5.2   K3V 513 1
5 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 848 0
6 * eps Eri BY* 03 32 55.8444911587 -09 27 29.739493865 5.19 4.61 3.73 3.00 2.54 K2V 1798 1
7 HD 282025 * 04 23 47.2501472640 +30 38 48.146129880   12.18 11.54     G 3 0
8 HD 290982 * 05 58 15.3456 +00 17 05.016   11.05 10.01     K0 5 0
9 BD+27 1311 PM* 07 05 42.2436886944 +27 28 14.986170552   11.41 10.184 9.731   K7V 51 0
10 HD 79210 SB* 09 14 22.7748624830 +52 41 11.791503353   9.388   6.8   K7V 283 0
11 HD 81809 SB* 09 27 46.8088908054 -06 04 17.008787302           G1.5IV-V 286 0
12 BD-08 2823 PM* 10 00 47.7204762252 -09 31 00.044866538   10.94 9.874 9.801   K4:V 60 1
13 Wolf 358 BY* 10 50 52.0312380389 +06 48 29.259617410 14.532 13.319 11.675 10.459 8.889 M4V 244 0
14 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 671 0
15 * 61 UMa PM* 11 41 03.0162706212 +34 12 05.881605449 6.31 6.08 5.34 4.73 4.38 G8V 590 0
16 BD+43 2140 * 11 41 32.5336344432 +42 53 05.448504372   10.00 9.18     G7V 11 0
17 BD+35 2310 PM* 12 04 53.8530790704 +34 37 14.279318076       10.358   K4/5V 22 0
18 V* CC Com EB* 12 12 06.0378799056 +22 31 58.682832024   13.09 11.42   10.085 K4/5V 205 0
19 Sand 53 PM* 12 20 34.9018749144 +26 48 38.248076844     14.89     M3: 6 0
20 Sand 62 PM* 12 22 47.8365067608 +27 11 57.092156736   15.39 13.84     M2e 8 0
21 V* MX Com EB* 12 23 54.8884627462 +22 45 46.025826901   13.09 11.98 11.38   ~ 3 0
22 Cl Melotte 111 OpC 12 24 03 +25 39.1           ~ 438 0
23 Cl* Melotte 111 GRZ 5 * 12 25 17.6435598120 +22 20 30.292616364   14.31 13.71 13.65   ~ 2 0
24 2MASS J12281278+2549347 Sy1 12 28 12.7844441184 +25 49 34.826496528     15.1     ~ 9 0
25 LP 377-100 Er* 12 29 27.1216080336 +22 59 46.730839956   15.77   13.885   M4.0V 39 0
26 87GB 122703.3+272832 AGN 12 29 34.2472107096 +27 11 56.385455604     13.1     ~ 16 1
27 ICRF J123014.0+251807 BLL 12 30 14.0893292232 +25 18 07.136022996   15.6 14.5 14.78   ~ 128 1
28 Cl* Melotte 111 GRZ 10 * 12 31 13.3704939576 +23 48 20.357990244   15.04 13.93 13.57   ~ 2 0
29 Cl* Melotte 111 GRZ 11 * 12 31 50.4959621880 +28 47 26.219394312     14.0 13.76   ~ 2 0
30 Cl* Melotte 111 GRZ 12 * 12 32 52.7842930656 +27 50 22.137317448   14.21 13.35 12.97   ~ 3 0
31 HD 115404 PM* 13 16 51.0514297623 +17 01 01.840901307   7.69 6.66     K2V 264 0
32 BD+17 2785 PM* 14 46 23.2823563482 +16 29 48.114202963 11.666 10.56 9.23 8.418 7.745 K5V 68 0
33 BD+16 2708 Er* 14 54 29.2361840107 +16 06 03.797990080 12.86 11.686 10.150 9.116 7.872 M3V 258 1
34 BD+25 2874 PM* 15 07 23.5837948451 +24 56 07.865562462   11.54   9.584   K5V 69 0
35 HD 144287 SB* 16 04 03.6443478821 +25 15 17.247159500   7.873 7.101 6.6   G8+V 159 0
36 HD 182488 PM* 19 23 34.0131683760 +33 13 19.078425912       5.8   K0V 261 1
37 HD 331161 ** 19 46 23.92746 +32 01 01.4390           M0.5V+M2.5V 81 0
38 HD 331161B PM* 19 46 24.2210910818 +32 00 57.782835021   12.03 11.03     M2.5V 42 0
39 HD 190404 PM* 20 03 52.1269218534 +23 20 26.469023374 8.490 8.080 7.270 6.759 6.314 K1V 226 0
40 * 61 Cyg A BY* 21 06 53.9395895022 +38 44 57.902349973 7.50 6.39 5.21 4.19 3.54 K5V 991 0
41 * 61 Cyg B Er* 21 06 55.2638444466 +38 44 31.358519864 8.63 7.40 6.03 4.86 3.55 K7V 694 1
42 HD 219134 Er* 23 13 16.9749603608 +57 10 06.083823619 7.460 6.560 5.570 4.76 4.23 K3V 558 1

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2022.05.22-01:31:01

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