2005A&A...438..291G


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.18CET04:23:05

2005A&A...438..291G - Astronomy and Astrophysics, volume 438, 291-300 (2005/7-4)

X-ray observations of the old open stellar cluster NGC 188.

GONDOIN P.

Abstract (from CDS):

I present the analysis results from XMM-Newton observations of the old open stellar cluster NGC 188, which has an age of about 7Gyr and a near solar metallicity. 58 X-ray sources were detected in the field of view of the EPIC MOS and pn cameras, and 46 sources are new X-ray detections. Visible counterparts were found for 20 sources including the variable star WV 28, the W UMa-type binaries V371 Cep and V372 Cep, and the red giant V11. 9 X-ray sources are identified with probable cluster non-members, while 43 X-ray sources are of unknown membership. X-ray emission was detected from 6 stars with high membership probability above a luminosity threshold of 1030erg/s. This indicates the presence of very active late-type stars in NGC 188 in spite of its old age. The HR diagram positions of two of these stars just above the main sequence are reminiscent of those for W Ursae Majoris-type contact binaries. Two other sources could be either members of close binary systems or the product of the coalescence of W UMa type binaries into single stars. One X-ray source in NGC 188 is located at the bottom of the red giant branch in an evolutionary status similar to that of an FK Comae-type star. Another X-ray source detected in NGC 188 has the HR diagram position of an M type star. Its X-ray to bolometric luminosity ratio, greater than the canonical 10–3 saturation level, suggests that the star was flaring during XMM-Newton observations. M stars are most likely the most numerous X-ray sources in NGC 188 at lower X-ray luminosity thresholds.

Abstract Copyright:

Journal keyword(s): open clusters and associations: general - stars: activity - stars: coronae - stars: evolution - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/438/291): table1.dat>

Nomenclature: Table 1: [G2005] NN (Nos 1-58).

CDS comments: in ref list Binnendijk 1970VA.....12..217B instead of VA.12.211 , KALUZNY 1987ApJ...314..585K instead of AJ.314

Simbad objects: 63

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Number of rows : 63

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2XMM J003430.9+851921 AG? 00 34 30.71 +85 19 21.2           ~ 2 0
2 XMMU J003518.3+852554 X 00 35 18.3 +85 25 54           ~ 1 0
3 XMMU J003601.3+851333 X 00 36 01.3 +85 13 33           ~ 1 0
4 XMMU J003637.8+852726 X 00 36 37.8 +85 27 26           ~ 1 0
5 XMMU J003751.1+852255 X 00 37 51.1 +85 22 55           ~ 1 0
6 XMMU J003758.5+852842 X 00 37 58.5 +85 28 42   21.41 20.98     ~ 1 0
7 XMMU J003901.6+852816 X 00 39 01.6 +85 28 16           ~ 1 0
8 2XMM J003907.9+851239 AG? 00 39 08.05 +85 12 39.5   19.76 19.30     ~ 2 0
9 XMMU J003921.1+851928 X 00 39 21.1 +85 19 28           ~ 1 0
10 XMMU J003925.9+850751 X 00 39 25.9 +85 07 51           ~ 1 0
11 2XMM J003947.3+852648 AG? 00 39 47.10 +85 26 47.7   21.52 21.44     ~ 2 0
12 XMMU J004038.6+852243 X 00 40 38.6 +85 22 43           ~ 1 0
13 XMMU J004049.2+851523 X 00 40 49.2 +85 15 23           ~ 1 0
14 XMMU J004055.3+851824 X 00 40 55.3 +85 18 24           ~ 1 0
15 XMMU J004058.6+851901 X 00 40 58.6 +85 19 01           ~ 1 0
16 XMMU J004126.5+852350 X 00 41 26.5 +85 23 50           ~ 1 0
17 2XMM J004127.7+851636 AG? 00 41 27.69 +85 16 36.7   18.20 17.78     ~ 2 0
18 XMMU J004132.7+851813 X 00 41 32.7 +85 18 13           ~ 1 0
19 XMMU J004134.2+851231 X 00 41 34.022 +85 12 30.31   21.01 19.34     ~ 1 0
20 XMMU J004140.8+852006 X 00 41 40.8 +85 20 06           ~ 1 0
21 XMMU J004207.2+852423 X 00 42 07.2 +85 24 23           ~ 1 0
22 XMMU J004223.2+852447 X 00 42 23.2 +85 24 47           ~ 1 0
23 XMMU J004228.8+853127 X 00 42 28.8 +85 31 27           ~ 1 0
24 XMMU J004238.7+852908 X 00 42 38.7 +85 29 08           ~ 1 0
25 2XMM J004240.6+851649 SB* 00 42 40.4822140602 +85 16 49.592603711 16.943 16.240 15.303 14.772 14.199 ~ 11 0
26 XMMU J004242.5+852356 X 00 42 42.5 +85 23 56           ~ 1 0
27 BD+84 12 * 00 42 43.4107840436 +85 14 14.131887771 10.061 10.05 9.55     F5 23 0
28 XMMU J004257.3+851823 X 00 42 57.3 +85 18 23           ~ 2 0
29 XMMU J004302.2+851311 X 00 43 02.2 +85 13 11   20.64 20.23     ~ 1 0
30 NGC 188 3135 * 00 43 23.8950306950 +85 20 32.686810912 15.695 15.558 15.071 14.771 14.405 ~ 14 0
31 XMMU J004335.4+852808 X 00 43 35.4 +85 28 08           ~ 1 0
32 XMMU J004417.6+851812 X 00 44 17.6 +85 18 12           ~ 1 0
33 2MASS J00442992+8520546 V* 00 44 29.9441761517 +85 20 54.809110675 17.019 16.877 16.096 15.534 15.158 ~ 10 0
34 2XMM J004437.7+852711 AG? 00 44 37.36 +85 27 11.5   19.62 19.18     ~ 3 0
35 2MASS J00444460+8532163 RG* 00 44 44.5814589588 +85 32 16.532492410   15.277 14.108     ~ 13 0
36 XMMU J004446.5+850846 X 00 44 46.5 +85 08 46           ~ 1 0
37 XMMU J004458.1+851921 X 00 44 58.1 +85 19 21           ~ 1 0
38 XMMU J004503.2+852230 X 00 45 03.2 +85 22 30           ~ 1 0
39 XMMU J004507.3+851526 X 00 45 07.3 +85 15 26           ~ 1 0
40 2MASS J00452260+8512381 SB* 00 45 22.5899810629 +85 12 38.301637432 15.349 14.79 13.84 13.355 12.832 ~ 26 0
41 [MJL2004] J004553.81+853030.6 X 00 45 53.81 +85 30 30.6           ~ 2 0
42 XMMU J004611.8+851445 X 00 46 11.8 +85 14 45   21.23 21.00     ~ 1 0
43 ClG J0046+8530 ClG 00 46 17.83 +85 31 09.5           ~ 12 0
44 XMMU J004647.9+852721 X 00 46 47.9 +85 27 21           ~ 1 0
45 [G2005] 7 X 00 46 57.4 +85 30 36   19.17 17.47     ~ 2 0
46 XMMU J004744.9+852211 X 00 47 44.9 +85 22 11           ~ 2 0
47 V* V371 Cep bL* 00 48 22.5448517560 +85 15 54.831602218   17.074 16.104     ~ 28 0
48 NGC 188 OpC 00 48 26 +85 15.3           ~ 804 0
49 XMMU J004852.6+852347 X 00 48 52.6 +85 23 47           ~ 1 0
50 V* V780 Cep BY* 00 50 02.8094930087 +85 21 22.975869501 16.485 16.24 15.51 15.143 14.707 ~ 15 0
51 Cl* NGC 188 E II-83 * 00 50 26.3854687234 +85 14 10.116191079   20.845 19.388 18.399 17.516 ~ 4 0
52 2XMM J005027.0+852212 AG? 00 50 26.93 +85 22 12.1   18.19 17.84     ~ 3 0
53 XMMU J005118.7+852301 X 00 51 18.7 +85 23 01           ~ 1 0
54 V* V372 Cep Ro* 00 51 24.2569367491 +85 18 03.359446939 14.223 14.029 13.246 12.681 12.154 ~ 19 0
55 XMMU J005210.4+852858 X 00 52 10.4 +85 28 58   21.58 21.37     ~ 1 0
56 XMMU J005232.9+852316 X 00 52 32.9 +85 23 16           ~ 1 0
57 XMMU J005241.1+852453 X 00 52 41.1 +85 24 53   22.27 21.50     ~ 1 0
58 XMMU J005328.6+852411 X 00 53 28.6 +85 24 11           ~ 1 0
59 2XMM J005417.7+852036 AG? 00 54 17.62 +85 20 36.4   21.42 20.92     ~ 3 0
60 * i Boo EB* 15 03 47.29565 +47 39 14.6228   5.41 4.76     G0Vn 522 0
61 WV 28 Cld 15 18 +46.8           ~ 4 0
62 * del CrB RS* 15 49 35.6468905541 +26 04 06.203245322 5.80 5.43 4.63 4.00 3.58 G5III-IVFe-1 192 0
63 V* VW Cep EB* 20 37 21.6248469581 +75 36 01.889162699   8.13   7.0   G8V+K0V 520 0

    Equat.    Gal    SGal    Ecl

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2020.02.18-04:23:05

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