2001AJ....121..337K


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.17CEST07:12:21

2001AJ....121..337K - Astron. J., 121, 337-346 (2001/January-0)

Observations of the core of the Pleiades with the Chandra X-ray observatory.

KRISHNAMURTHI A., REYNOLDS C.S., LINSKY J.L., MARTIN E. and GAGNE M.

Abstract (from CDS):

We present results from a 36 ks observation of the core of the Pleiades open cluster using ACIS-I on the Chandra X-Ray Observatory. We have detected 57 sources, most of which do not have previously known optical counterparts. Follow-up photometry indicates that many of the detections are likely to be active galactic nuclei, in accordance with extragalactic source counts, but some of the sources may be previously undiscovered low-mass members of the Pleiades. We discuss our data set and our findings about X-ray emission from early-type stars, as well as very late-type stars. In particular, the large X-ray fluxes, lack of variability, and hardness ratios of the four Pleiades B6 IV-F4 V stars suggest a tentative conclusion that Pleiades stars in this spectral type range are intrinsic X-ray sources rather than previously unknown binaries in which the X-ray emission is from a late-type companion. Also, the sensitivity of Chandra allowed us to detect nonflare X-ray emission from late M stars.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: Pleiades - Stars: Activity - Stars: Early-Type - Stars: Low-Mass, Brown Dwarfs

VizieR on-line data: <Available at CDS (J/AJ/121/337): table1.dat table2.dat>

Nomenclature: Table 1: [KRL2001] NN (Nos 1-57). Table 3: [KRL2001] JHHMMSS.ss+DDMMSS.ss N=15.

Simbad objects: 79

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Number of rows : 79

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 738 0
2 LP 944-20 BD* 03 39 35.2525168530 -35 25 43.628465433   20.17 18.69 16.39 13.288 M9.5Ve 257 0
3 [KRL2001] J034607.15+241105.91 X 03 46 07.15 +24 11 05.9           ~ 1 0
4 [KRL2001] J034609.84+240954.32 X 03 46 09.84 +24 09 54.3           ~ 1 0
5 [KRL2001] J034612.70+240345.38 X 03 46 12.70 +24 03 45.4           ~ 1 0
6 V* V1189 Tau BY* 03 46 12.8676307816 +24 03 15.755099143   15.59 14.22   12.48 KV 37 0
7 [KRL2001] J034615.95+240826.20 X 03 46 15.95 +24 08 26.2           ~ 1 0
8 HD 23479 ** 03 46 16.0038790173 +24 11 23.720970489   8.91 8.80 8.72 7.57 A7V 89 0
9 [KRL2001] 57 X 03 46 17.45 +23 58 32.8           ~ 1 0
10 [KRL2001] 53 X 03 46 17.71 +24 01 10.5           ~ 1 0
11 CXOP J034619.4+235628 X 03 46 19.42 +23 56 29.2           ~ 2 0
12 * 23 Tau Be* 03 46 19.5738428 +23 56 54.081244 3.70 4.12 4.18   4.16 B6IV(e) 406 2
13 [KRL2001] 50 X 03 46 20.85 +23 58 58.5           ~ 1 0
14 [KRL2001] 49 X 03 46 21.56 +24 07 17.0           ~ 1 0
15 [KRL2001] 48 X 03 46 23.39 +24 08 56.0           ~ 1 0
16 V* V528 Tau Fl* 03 46 23.4665443108 +24 01 51.395204844     18.50   15.10 ~ 20 0
17 [KRL2001] 46 X 03 46 23.70 +23 55 38.9           ~ 1 0
18 [KRL2001] 56 X 03 46 24.91 +24 01 29.3           ~ 1 0
19 V* OZ Tau Fl* 03 46 25.3872736563 +24 09 36.469550080     15.83   13.37 M 37 0
20 [KRL2001] 44 X 03 46 28.01 +23 55 32.5           ~ 1 0
21 [KRL2001] 43 X 03 46 28.15 +23 57 54.7           ~ 1 0
22 [KRL2001] 42 X 03 46 29.47 +24 00 41.9           ~ 1 0
23 [KRL2001] 40 X 03 46 30.32 +24 08 53.8           ~ 1 0
24 [KRL2001] 41 X 03 46 30.41 +24 05 05.6           ~ 1 0
25 V* PP Tau Fl* 03 46 31.1853668283 +24 07 02.432449051   15.60 14.21   12.39 K5V 52 0
26 V* PQ Tau Fl* 03 46 32.1221011144 +23 58 58.750008796   14.30       K7 19 0
27 [KRL2001] 37 X 03 46 32.39 +24 05 47.8           ~ 1 0
28 [KRL2001] J034634.10+240149.53 X 03 46 34.10 +24 01 49.5           ~ 1 0
29 2MASS J03463552+2401355 * 03 46 35.5321307482 +24 01 35.530997100     19.00   15.40 MV 13 0
30 [KRL2001] 35 X 03 46 35.66 +24 07 52.8           ~ 1 0
31 V* V448 Tau Fl* 03 46 35.9115616901 +23 58 01.275913611   15.42 14.02     KV 29 0
32 [KRL2001] 33 X 03 46 38.80 +23 58 05.1           ~ 1 0
33 HD 23511 PM* 03 46 39.3333752913 +24 06 11.531106899   9.75 9.28   8.75 F5V 92 0
34 V* V814 Tau BY* 03 46 39.3862690551 +24 01 46.866367238   13.04 12.12   11.24 K3V 66 0
35 [KRL2001] 30 X 03 46 40.99 +24 07 46.3           ~ 1 0
36 [KRL2001] 29 X 03 46 41.29 +24 04 26.0           ~ 1 0
37 [KRL2001] 28 X 03 46 41.94 +24 03 51.2           ~ 1 0
38 Cl* Melotte 22 DH 467 *iC 03 46 43.5896077041 +23 59 42.500638595   17.667 16.120   13.771 ~ 17 0
39 [KRL2001] J034643.64+240120.57 X 03 46 43.64 +24 01 20.6           ~ 1 0
40 [KRL2001] 26 X 03 46 44.29 +23 59 11.5           ~ 1 0
41 [KRL2001] J034646.01+240503.26 X 03 46 46.01 +24 05 03.3           ~ 1 0
42 [KRL2001] 25 X 03 46 46.71 +24 07 57.6           ~ 1 0
43 [KRL2001] 24 X 03 46 47.23 +24 01 28.9           ~ 1 0
44 [KRL2001] J034648.08+240334.63 X 03 46 48.08 +24 03 34.6           ~ 1 0
45 [KRL2001] 23 X 03 46 48.54 +24 00 40.6           ~ 1 0
46 [KRL2001] J034649.03+240003.47 X 03 46 49.03 +24 00 03.5           ~ 1 0
47 [KRL2001] 22 X 03 46 49.13 +24 08 33.5           ~ 1 0
48 [KRL2001] 21 * 03 46 51.4274950322 +24 06 16.279297750           ~ 4 0
49 [KRL2001] 20 X 03 46 51.97 +24 00 04.6           ~ 1 0
50 [KRL2001] 19 X 03 46 53.05 +23 56 55.2           ~ 1 0
51 Cl* Melotte 22 MHO 8 *iC 03 46 53.9570071433 +24 07 57.244112352     18.92     MV 9 0
52 Cl* Melotte 22 DH 478 *iC 03 46 55.3103073632 +24 11 16.776909138     19.02   15.68 MV 13 0
53 [KRL2001] 16 X 03 46 55.63 +24 02 56.9           ~ 1 0
54 [KRL2001] 15 X 03 46 55.74 +24 01 52.7           ~ 1 0
55 [KRL2001] J034657.40+241307.10 X 03 46 57.40 +24 13 07.1           ~ 1 0
56 [KRL2001] 14 X 03 46 58.15 +24 01 40.4           ~ 1 0
57 Cl* Melotte 22 DH 484 *iC 03 46 59.3109694929 +24 01 42.918351461   19.90 17.60   14.40 MV 19 0
58 [KRL2001] J034659.54+240421.01 X 03 46 59.54 +24 04 21.0           ~ 1 0
59 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2895 0
60 [KRL2001] 12 X 03 47 00.80 +24 13 24.6           ~ 1 0
61 [KRL2001] 11 X 03 47 01.29 +24 02 06.1           ~ 1 0
62 [KRL2001] 10 X 03 47 01.66 +24 10 47.5           ~ 1 0
63 [KRL2001] J034703.30+241214.07 X 03 47 03.30 +24 12 14.1           ~ 1 0
64 V* V535 Tau Fl* 03 47 03.5821837829 +24 09 34.871060040   15.93 14.58   12.72 K8 50 0
65 [KRL2001] J034704.02+235942.68 X 03 47 04.02 +23 59 42.7           ~ 1 0
66 [KRL2001] 8 X 03 47 05.71 +23 59 42.3           ~ 1 0
67 [KRL2001] 7 X 03 47 07.59 +24 10 16.2           ~ 1 0
68 Cl* Melotte 22 VM 21 *iC 03 47 09.1823623730 +24 03 07.824729835   18.33 16.52     ~ 12 0
69 [KRL2001] J034711.70+240653.58 X 03 47 11.70 +24 06 53.6           ~ 1 0
70 [KRL2001] 5 X 03 47 14.10 +24 03 18.7           ~ 1 0
71 HD 23608 ** 03 47 16.5764110218 +24 07 41.906506002   9.15 8.72   8.09 F3V 72 0
72 [KRL2001] 3 X 03 47 16.98 +24 12 33.7           ~ 1 0
73 V* V646 Tau Fl* 03 47 18.141 +24 02 11.42   15.42 14.02   12.14 M: 47 0
74 [KRL2001] J034722.49+240009.89 X 03 47 22.49 +24 00 09.9           ~ 1 0
75 Cl* Melotte 22 HHJ 427 *iC 03 47 25.3421629849 +24 02 56.966139066     16.1   13.79 MV 15 0
76 NAME Hyades OpC 04 26 54.00 +15 52 00.0           ~ 2572 0
77 IC 2391 OpC 08 40 32 -53 02.0     2.5     ~ 703 0
78 IC 2602 OpC 10 42 58 -64 24.0           ~ 538 0
79 VB 10 Fl* 19 16 57.6103282334 +05 09 01.588675251   19.42 17.30     M8V 426 1

    Equat.    Gal    SGal    Ecl

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2019.09.17-07:12:21

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