2003A&A...405..551F

Query : 2003A&A...405..551F

2003A&A...405..551F - Astronomy and Astrophysics, volume 405551-561 (2003/7-2)

Is Praesepe really different from the coeval Hyades cluster? The XMM-Newton view.

FRANCIOSINI E., RANDICH S. and PALLAVICINI R.

Abstract (from CDS):

The Praesepe open cluster represents a puzzle since it has about the same age as the Hyades, and only slightly different metallicity, yet previous ROSAT observations resulted in a detection rate of cluster sources significantly lower than for the Hyades. We present a new 50-ksec observation of Praesepe performed with the EPIC instrument on board XMM- Newton, which resulted in the detection of ∼200 sources, including 48 cluster members. We detected all solar-type (F-G) stars in the field of view, ∼90% of the K stars and ∼70% of the M stars. We find that the distribution of X-ray luminosities of solar-type Praesepe members is comparable to that of the Hyades, in contrast with the previous ROSAT results; however, the disagreement between the ROSAT and XMM-Newton results appears to be mostly due to X-ray faint Praesepe members falling outside the XMM-Newton field of view, while it is considerably reduced when considering only the subsample of stars in the ROSAT survey in common with the present observation. The finding supports an earlier suggestion that Praesepe may be formed by two merged clusters of different age.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: Praesepe - stars: activity - stars: coronae - X-ray: stars

Nomenclature: Table 3: [FRP2003] JHHMMSS.ss+DDMMSS.s N=24.

CDS comments: In table 3, GSC2 N231230081115 is a misprint for N23123008115. KW = Cl* NGC 2632 KW, JS = Cl* NGC 2632 JS, HSHJ = Cl* NGC 2632 HSHJ, WRS = Cl* NGC 2632 WRS in SIMBAD

Simbad objects: 90

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Number of rows : 90
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 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
2 Cl* NGC 2632 JC 137 * 08 38 53.5380951726 +19 34 16.965928938   15.49 14.07     K6V 55 0
3 SDSS J083857.85+193335.7 QSO 08 38 57.8619391824 +19 33 35.781427224   18.95 18.75     ~ 21 0
4 Cl* NGC 2632 JC 143 Er* 08 39 02.9127193992 +19 31 57.119869776   18.40 16.80     M3.3 25 0
5 Cl* NGC 2632 HSHJ 246 Er* 08 39 03.0850118640 +19 24 15.695154900         15.54 M3.9 32 0
6 Cl* NGC 2632 KW 144 * 08 39 04.0505884632 +19 23 44.003969700   14.5       ~ 3 0
7 Cl* NGC 2632 JC 144 Ro* 08 39 04.1128930999 +19 31 21.681253411   14.995 13.772     K5V 55 0
8 HD 73449 V* 08 39 06.1081366296 +19 40 36.533338500   7.70 7.45     A9Vn 84 0
9 LB 384 QSO 08 39 06.9436120896 +19 21 48.685178772   17.73 17.73     ~ 111 1
10 V* BS Cnc dS* 08 39 09.0975243288 +19 35 32.619758244   8.78 8.59     A9V 130 0
11 Cl* NGC 2632 RG 329 * 08 39 10.1433400116 +19 40 42.341782111   9.83 9.41     F4V 55 0
12 GSC2 N23123008580 ? 08 39 10.32 +19 33 28.0           ~ 1 0
13 GSC2 N23123009123 * 08 39 10.664 +19 35 16.70           ~ 1 0
14 GSC2 N23123009122 * 08 39 10.8212279016 +19 35 09.188219292           ~ 2 1
15 2MASS J08391260+1930100 * 08 39 12.6004541880 +19 30 10.060628220           ~ 1 0
16 Cl* NGC 2632 WRS 4 Er* 08 39 12.7225425240 +19 30 16.863423624         16.89 M6.3 23 0
17 Cl* NGC 2632 KW 163 * 08 39 14.0371135008 +19 33 24.200339760   14.2       ~ 3 0
18 Cl* NGC 2632 JS 706 Er* 08 39 15.0921410232 +19 43 31.606206960   19.50 16.96     M3.7 22 0
19 SDSS J083916.04+194249.5 QSO 08 39 16.0419846240 +19 42 49.561476552   19.81 19.45     ~ 18 0
20 GSC2 N23122205633 * 08 39 16.4101454808 +19 38 09.350686752           ~ 1 0
21 Cl* NGC 2632 HSHJ 258 Er* 08 39 18.5004190200 +19 22 44.280971364           M4.7 34 0
22 BD+19 2061 Ro* 08 39 24.9776363874 +19 27 33.640292958   11.066 10.461     G0V 89 0
23 2MASS J08392650+1937034 * 08 39 26.51 +19 37 03.4           ~ 1 0
24 Cl* NGC 2632 KW 184 Ro* 08 39 28.5832805843 +19 28 25.139885585   12.519 11.606     K0V 67 0
25 Cl* NGC 2632 JS 298 Er* 08 39 31.7519044200 +19 24 17.570423484   20.31 17.71     M2.8 41 0
26 Cl* NGC 2632 JC 165 Ro* 08 39 36.4538852052 +19 29 07.877611515   16.544 15.106     M0V 46 0
27 [FRP2003] J083936.65+194510.8 * 08 39 36.602 +19 45 11.04           ~ 1 0
28 Cl* NGC 2632 JC 168 Ro* 08 39 38.3646283704 +19 26 27.074546808   13.627 12.648     K3V 60 0
29 Cl* NGC 2632 JS 305 * 08 39 38.4090916008 +19 44 18.805534800   20.33 17.92     ~ 3 0
30 Cl* NGC 2632 HSHJ 283 LM* 08 39 41.6622529464 +19 29 00.623822784           M6V 20 0
31 StKM 1-717 PM* 08 39 43.3343630208 +19 25 11.747957124   12.70   10.3   K8V 18 0
32 Cl* NGC 2632 S 83 Ro* 08 39 45.7489350539 +19 22 01.145101156   11.257 10.640     G1V 93 0
33 Cl* NGC 2632 JS 713 Er* 08 39 46.7419169064 +19 44 12.581660832   21.17 18.35     M3.9 26 0
34 Cl* NGC 2632 HSHJ 289 * 08 39 47.2952980896 +19 39 34.337381616           M3.7 27 0
35 2MASS J08394781+1928033 BD? 08 39 47.7978721725 +19 28 02.922583667         18.81 ~ 6 0
36 HD 73598 ** 08 39 50.7154795152 +19 32 26.919638988   7.53 6.60     G8III-IIIb 130 0
37 Cl* NGC 2632 KW 211 * 08 39 50.7489880800 +19 19 06.049749324   14.5       ~ 8 0
38 Cl* NGC 2632 KW 213 Er* 08 39 50.8363831685 +19 33 02.073309982   12.61 11.84     G6.1 51 0
39 Cl* NGC 2632 S 87 Ro* 08 39 52.3360004784 +19 18 45.497218727   10.742 10.217     F7V 81 0
40 2MASS J08395316+1924037 Er* 08 39 53.1604377384 +19 24 03.726918612           M3.2 34 0
41 Cl* NGC 2632 HSHJ 291 Er* 08 39 54.4075529616 +19 27 37.180481760         15.52 M3.8 34 0
42 GSC2 N23122205423 * 08 39 56.2924990368 +19 36 37.513201140           ~ 1 0
43 HD 73618 ** 08 39 56.4981407544 +19 33 10.788354324   7.49 7.30     kA4mF0III 95 0
44 Cl* NGC 2632 ART 325 * 08 39 56.7093705912 +19 42 58.818200256   15.9 15.0     ~ 4 0
45 HD 73619 SB* 08 39 57.7696065768 +19 32 29.322827124   7.72 7.43     kA4mF2III 115 0
46 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
47 Cl* NGC 2632 KW 236 Ro* 08 39 59.830176 +19 34 00.31224   12.880 11.886 11.649   K 32 0
48 Cl* NGC 2632 JC 177 Ro* 08 39 59.9819394840 +19 34 40.475004204   13.861 12.855     K2.3 56 0
49 Cl* NGC 2632 JC 180 Er* 08 40 00.7105653168 +19 18 34.753470084   15.805 14.427     K8V 39 0
50 Cl* NGC 2632 HSHJ 293 Er* 08 40 02.4883332864 +19 40 35.371766712           M3.3 26 0
51 Cl* NGC 2632 JC 184 Er* 08 40 04.1612039856 +19 47 04.006734756   12.899 12.030     K0V 43 0
52 Cl* NGC 2632 HSHJ 295 Er* 08 40 04.1650623936 +19 24 50.265031680   20.63 18.02     M3.4 38 0
53 BD+20 2157 * 08 40 04.9021306639 +19 43 45.329644107   10.26 9.79     F5V 73 0
54 [FRP2003] J084005.07+193818.2 * 08 40 05.18 +19 38 20.4   10.347 9.889     ~ 2 0
55 Cl* NGC 2632 S 104 Ro* 08 40 06.3564902093 +19 18 26.507970736   11.761 10.980     K4 62 0
56 Cl* NGC 2632 KW 262 * 08 40 09.4740701592 +19 31 51.219573708   14.2       ~ 8 0
57 Cl* NGC 2632 JC 190 Ro* 08 40 09.6806371620 +19 37 17.099047170   12.808 11.973     G9V 74 0
58 Cl* NGC 2632 S 106 * 08 40 10.5548169768 +19 26 29.999306508   12.11 11.70     ~ 10 0
59 [FRP2003] J084011.87+192824.5 * 08 40 11.475 +19 28 23.16           ~ 1 0
60 Cl* NGC 2632 HSHJ 302 Er* 08 40 11.5884886238 +19 39 11.789641692           M3.7 28 0
61 BD+20 2160 SB* 08 40 12.3183004632 +19 38 22.320363696   10.45 9.86     F5V 63 0
62 NVSS J084013+192808 rG 08 40 12.9651542376 +19 28 04.426749624           ~ 3 1
63 Cl* NGC 2632 HSHJ 304 Er* 08 40 13.0813496136 +19 45 49.973228784           ~ 21 0
64 2MASS J08401334+1928088 * 08 40 13.3637185968 +19 28 08.921348292           ~ 1 0
65 Cl* NGC 2632 JC 194 Er* 08 40 13.7858302594 +19 44 56.007315711   17.56 16.06     M1.2 42 0
66 Cl* NGC 2632 JC 197 * 08 40 15.5030735288 +19 27 30.996811802   15.24 13.91     K6V 42 0
67 HD 73711 * 08 40 18.0969905712 +19 31 55.163632944   7.67 7.51     F0III 122 0
68 HD 73712 SB* 08 40 20.1451748712 +19 20 56.315955804   7.04 6.78     A9V 106 0
69 HD 73709 SB* 08 40 20.7479143752 +19 41 12.242993316   7.87 7.68     kA2hA5mF0(III-IV)(Cr) 120 0
70 2MASS J08402194+1921176 * 08 40 21.9513714456 +19 21 17.669414052           ~ 1 0
71 HD 73710 * 08 40 22.0864518288 +19 40 11.771283936 8.290 7.410 6.390 5.70 5.21 G9III-IIIb 201 0
72 Cl* NGC 2632 S 118 Ro* 08 40 22.7158598352 +19 27 53.156521224   11.303 10.673     F7.2 74 0
73 Cl* NGC 2632 S 119 SB* 08 40 23.2706451960 +19 40 23.704368132   10.96 10.37 10.357   G0V 38 0
74 Cl* NGC 2632 S 121 Er* 08 40 25.5398133658 +19 28 32.736891286   10.37 9.89     F5V 70 0
75 BD+20 2170 * 08 40 26.1405874128 +19 41 11.315709132   9.79 9.45     F5V 74 0
76 * eps Cnc SB* 08 40 27.0100951392 +19 32 41.324313444 6.630 6.460 6.290     A5m 144 0
77 Cl* NGC 2632 JC 209 Er* 08 40 27.5113002591 +19 39 19.765256407   14.31 13.22     K4V 51 0
78 Cl* NGC 2632 JC 212 * 08 40 31.5051444174 +19 41 43.051985858   16.56 15.11     ~ 29 0
79 Cl* NGC 2632 JC 215 Ro* 08 40 33.4642580616 +19 38 00.935332332   13.094 12.198     K0.8 66 0
80 Cl* NGC 2632 KW 317 * 08 40 35.1206306208 +19 32 02.248276776   13.58 13.0     ~ 10 0
81 2MASS J08403799+1936285 LM* 08 40 37.9856046576 +19 36 28.538596548           M6V 8 0
82 GSC2 N23122203337 * 08 40 38.7244278696 +19 24 37.102902408           ~ 1 0
83 2MASS J08403942+1942553 ** 08 40 39.42120 +19 42 55.3608           M4.0 12 0
84 Cl* NGC 2632 S 134 Ro* 08 40 39.9178822906 +19 40 09.192415392   11.580 10.859     G2V 61 0
85 V* BB Cnc Er* 08 40 41.6582581200 +19 30 00.797467572           M4.8 21 0
86 Cl* NGC 2632 S 138 Ro* 08 40 42.4813583883 +19 33 57.623817270   12.063 11.331     G4V 84 0
87 Cl* NGC 2632 S 142 * 08 40 47.1890434248 +19 32 37.406330484   11.46 10.48     G5: 11 0
88 Cl* NGC 2632 S 143 Ro* 08 40 47.9832672792 +19 39 32.161833069   11.757 10.991     G2V 58 0
89 Cl* NGC 2632 S 148 Ro* 08 40 52.5239203352 +19 28 59.564290896   10.839 10.267     F8V 78 0
90 V* EP Cnc dS* 08 40 56.2946955456 +19 34 49.228381848 7.090 6.950 6.780     A6Vn 131 0

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