2002A&A...387..463B


Query : 2002A&A...387..463B

2002A&A...387..463B - Astronomy and Astrophysics, volume 387, 463-478 (2002/5-4)

ROSAT PSPC/HRI observations of the open cluster NGC 2422.

BARBERA M., BOCCHINO F., DAMIANI F., MICELA G., SCIORTINO S., FAVATA F. and HARNDEN F.R.Jr

Abstract (from CDS):

We present the results of a ROSAT study of NGC 2422, a southern open cluster at a distance of about 470pc, with an age close to the Pleiades. Source detection was performed on two observations, a 10-ks PSPC and a 40-ks HRI pointing, with a detection algorithm based on wavelet transforms, particularly suited to detecting faint sources in crowded fields. We have detected 78 sources, 13 of which were detected only with the HRI, and 37 detected only with the PSPC. For each source, we have computed the 0.2-2.0keV X-ray flux. Using optical data from the literature and our own low-dispersion spectroscopic observations, we find candidate optical counterparts for 62 X-ray sources, with more than 80% of these counterparts being late type stars. We have assigned to the optical sources an astrometric and/or a photometric membership flag, depending on which data are available to us. The number of sources (38 of 62) with high membership probability counterparts is consistent with that expected for Galactic plane observations at our sensitivity. We have computed maximum likelihood X-ray luminosity functions (XLF) for F and early-G type stars with high membership probability. Heavy data censoring due to our limited sensitivity permits determination of only the high-luminosity tails of the XLFs; the distributions are indistinguishable from those of the nearly coeval Pleiades cluster.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: NGC 2422 - stars: coronae - X-rays: stars

Nomenclature: Table 1: [BBD2002] PNN (Nos P01-P71), [BBD2002] HNN (Nos H01-H45), [BBD2002] NNNN N=28.

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 - 2022
#notes
1 Cl Stock 2 OpC 02 15 25 +59 31.3           ~ 106 0
2 V* V1170 Tau BY* 03 44 26.2759113581 +24 35 22.939007310 14.435 12.288 11.461   10.520 G8V 73 0
3 V* V1065 Tau RS* 03 46 40.2476949658 +23 29 51.877806260 14.016 13.01 12.02   10.93 G7V 69 0
4 V* V1282 Tau RS* 03 49 06.1083396732 +23 46 52.469922436   11.63 10.803 9.8 9.831 G7IV 81 0
5 HD 60718 PM* 07 35 20.5825419384 -14 02 51.036640872   8.21 7.63     F7/G0V 16 0
6 [BBD2002] P66 X 07 35 24.0 -14 01 26           ~ 1 0
7 [BBD2002] P63 X 07 35 25.1 -14 23 38           ~ 1 0
8 1RXS J073530.7-134113 Ro* 07 35 30.1415590912 -13 41 07.911068753   11.70 10.79 10.54 9.754 ~ 3 0
9 [BBD2002] H38 X 07 35 52.8 -14 36 04           ~ 1 0
10 [BBD2002] P53 * 07 35 55.7 -14 33 43           G0 1 0
11 Cl* NGC 2422 PMS 668 * 07 35 56.5325207088 -14 25 41.185332264 17.472 16.503 15.468 14.849 14.198 K0 5 0
12 [BBD2002] P50 X 07 35 58.9 -14 16 26           ~ 1 0
13 [BBD2002] P52 * 07 36 01.8 -14 21 29           MV:e 1 0
14 [BBD2002] P40 * 07 36 02.2 -14 30 18           ~ 1 0
15 HD 60855 Be* 07 36 03.8931067344 -14 29 33.978895368 4.87 5.58 5.70 5.72 5.81 B2Ve 135 0
16 NGC 2422 44 * 07 36 09.4 -14 02 56           ~ 1 0
17 Cl* NGC 2422 HOAG 145 * 07 36 15.1 -14 23 42           F7 1 0
18 Cl* NGC 2422 PMS 1096 * 07 36 18.6049337256 -14 22 59.841787332 13.945 13.749 13.109 12.691 12.322 G3 9 0
19 [BBD2002] P57 X 07 36 19.8 -14 23 24           ~ 1 0
20 UCAC4 379-035830 * 07 36 20.2571609016 -14 20 24.200588004   14.05 13.24 12.97   G6 4 0
21 Cl* NGC 2422 PMS 572 V* 07 36 22.7152535736 -14 23 31.950296124 16.629 15.826 14.849 14.280 13.751 ~ 7 0
22 [BBD2002] P30 X 07 36 23.8 -14 16 08           ~ 1 0
23 [BBD2002] P21 X 07 36 24.8 -14 32 35           ~ 1 0
24 Cl* NGC 2422 PMS 562 V* 07 36 24.9007596912 -14 27 14.281962156 17.080 16.235 15.352 14.675 14.056 ~ 7 0
25 [BBD2002] P46 X 07 36 25.2 -14 42 11           ~ 1 0
26 HD 60969 * 07 36 27.4402662744 -14 35 42.310065480   6.94 7.02     B3III/IV 34 0
27 Cl* NGC 2422 SN 48 * 07 36 28.8 -14 22 26   12.90 11.92     ~ 2 0
28 HD 60968 PM* 07 36 29.5179112152 -14 27 34.028734140   9.88 9.15     K0 12 0
29 [BBD2002] P29 * 07 36 33.5 -14 14 10           ~ 1 0
30 Cl* NGC 2422 SN 54 * 07 36 35.2176202008 -14 31 47.839264896   12.95 12.39     F7 2 0
31 NGC 2422 OpC 07 36 35 -14 29.3           ~ 229 0
32 [BBD2002] H11 X 07 36 35.6 -14 29 06           ~ 1 0
33 [BBD2002] P20 X 07 36 36.0 -14 33 25           ~ 1 0
34 Cl* NGC 2422 SN 49 * 07 36 36.1601108040 -14 28 15.182025816   12.71 12.19 12.15   F7 3 0
35 [BBD2002] P06 X 07 36 37.1 -14 23 10           ~ 1 0
36 [BBD2002] P49 X 07 36 37.1 -14 10 12           ~ 1 0
37 UCAC4 377-035019 * 07 36 37.6796957688 -14 38 18.941002476           ~ 4 0
38 [BBD2002] P68 X 07 36 39.2 -13 46 41           ~ 1 0
39 [BBD2002] P48 * 07 36 40.0 -14 43 44           ~ 1 0
40 HD 61017 * 07 36 41.2521680688 -14 26 37.013679816 6.37 6.626 6.681     B9III 38 0
41 [BBD2002] P62 * 07 36 41.4 -14 50 42           ~ 1 0
42 [BBD2002] P12 X 07 36 42.5 -14 32 10           ~ 1 0
43 [BBD2002] P08 X 07 36 42.5 -14 23 24           ~ 1 0
44 Cl* NGC 2422 PMS 495 * 07 36 43.83 -14 24 40.3   18.099 16.695 15.796 14.822 M0V:e 2 0
45 [BBD2002] P18 X 07 36 43.9 -14 30 40           ~ 1 0
46 UCAC4 379-035982 * 07 36 44.9668335120 -14 21 44.832213540           ~ 4 0
47 Cl* NGC 2422 PMS 1141 * 07 36 45.6369184032 -14 28 55.264085688 13.790 13.661 13.030 12.645 12.254 G2 4 0
48 HD 61045 ** 07 36 47.1653427840 -14 33 41.765206968   7.92 7.98     B8pSi 56 0
49 NGC 2422 109 * 07 36 47.5 -13 59 56           ~ 1 0
50 [BBD2002] P51 * 07 36 50.0 -14 18 00           ~ 1 0
51 [BBD2002] P43 * 07 36 54.0 -14 23 24           G9 1 0
52 UCAC4 378-036690 * 07 36 54.0306161568 -14 33 05.632589088       14.32   ~ 5 0
53 [BBD2002] H27 X 07 36 54.4 -14 30 36           ~ 1 0
54 [BBD2002] H33 X 07 36 54.4 -14 22 52           ~ 1 0
55 Cl* NGC 2422 I 481 * 07 36 57.0016066488 -14 22 20.594467056 13.785 13.629 12.924 12.557 12.131 ~ 8 0
56 [BBD2002] P14 X 07 36 58.3 -14 29 49           ~ 1 0
57 [BBD2002] P26 X 07 36 58.3 -14 12 18           ~ 1 0
58 [BBD2002] P47 * 07 37 03.0 -14 43 12           G0 1 0
59 [BBD2002] P10 X 07 37 03.0 -14 18 18           ~ 1 0
60 [BBD2002] H10 X 07 37 03.4 -14 28 34           ~ 1 0
61 [BBD2002] P27 X 07 37 05.0880368736 -14 36 18.062571924           ~ 1 0
62 ATO J114.2748-14.4914 V* 07 37 05.9744567904 -14 29 29.281577892   15.15 14.06 13.67   K0e 6 0
63 NGC 2422 119 * 07 37 06.3533313015 -14 33 42.329897961 14.164 13.949 13.278 12.842 12.395 F3 2 0
64 [BBD2002] P25 X 07 37 06.6 -14 31 41           ~ 1 0
65 UCAC4 379-036139 * 07 37 07.1726883960 -14 15 42.482879388   13.07 12.49 12.34   F7 5 0
66 [BBD2002] P65 X 07 37 09.1 -13 52 26           ~ 1 0
67 [BBD2002] P16 X 07 37 09.8 -14 25 01           ~ 1 0
68 [BBD2002] H13 X 07 37 12.4 -14 21 54           ~ 1 0
69 [BBD2002] P23 X 07 37 13.4 -14 40 48           ~ 1 0
70 Cl* NGC 2422 PMS 1062 * 07 37 15.3952835280 -14 33 35.578614996 14.531 14.269 13.562 13.108 12.671 ~ 6 0
71 [BBD2002] H24 X 07 37 17.4 -14 30 47           ~ 1 0
72 [BBD2002] P33 * 07 37 18.5 -14 31 44           F8 1 0
73 [BBD2002] P32 * 07 37 26.0204763840 -14 17 02.001300324           ~ 1 0
74 Cl* NGC 2422 PMS 1206 * 07 37 34.8377053296 -14 24 29.403995544 12.328 12.273 11.802 11.508 11.174 F3 5 0
75 [BBD2002] H37 X 07 37 36.8 -14 29 49           ~ 1 0
76 [BBD2002] P71 X 07 37 44.0 -13 40 26           ~ 1 0
77 NGC 2422 126 * 07 37 45.5 -14 48 11           ~ 1 0
78 [BBD2002] P58 X 07 37 45.5 -14 36 40           ~ 1 0
79 NGC 2422 127 * 07 37 51.6 -14 05 56           ~ 1 0
80 [BBD2002] P44 * 07 37 54.5 -14 30 54           F7 1 0
81 [BBD2002] P55 X 07 38 37.0 -14 14 24           ~ 1 0
82 [BBD2002] P69 X 07 38 43.8 -14 00 11           ~ 1 0
83 NGC 6475 OpC 17 53 47 -34 50.5           ~ 356 0
84 Cl* NGC 2422 SN 62 * ~ ~   13.25 12.71     ~ 2 0
85 Cl* NGC 2422 SN 50 * ~ ~   12.97 12.15     ~ 2 0
86 Cl* NGC 2422 I 157 * ~ ~           ~ 1 0
87 NGC 2422 28 * ~ ~           ~ 1 0
88 NGC 2422 66 * ~ ~           ~ 1 0
89 Cl* NGC 2422 SN 71 * ~ ~   13.85 13.15     ~ 2 0
90 Cl* NGC 2422 SN 66 * ~ ~   13.55 12.95     ~ 2 0

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2022.08.18-01:28:16

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