2001AJ....121..337K

Query : 2001AJ....121..337K

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 - 2026 		#notes
1 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
2 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 308 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 12.8676359335 +24 03 15.754257358   15.59 14.22   12.48 M1.4 80 0
7 [KRL2001] J034615.95+240826.20 X 03 46 15.95 +24 08 26.2           ~ 1 0
8 HD 23479 Er* 03 46 16.0035787584 +24 11 23.722659996   8.91 8.80 8.72 7.57 A7V 120 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 19.5858871361 +23 56 54.092177220 3.70 4.12 4.18   4.16 B6IV(e) 446 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 Er* 03 46 23.4665085267 +24 01 51.397679361     18.50   15.10 ~ 42 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 PM* 03 46 25.3897599128 +24 09 36.475521778   17.09 16.05 15.59 13.37 M3.1 62 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 Y*O 03 46 31.1851066172 +24 07 02.431428754   15.60 14.21   12.39 M1.6 84 0
26 V* PQ Tau PM* 03 46 32.1220179264 +23 58 58.752905988   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 Cl* Melotte 22 DH 458 Er* 03 46 35.5305948311 +24 01 35.525924494     19.00   15.40 MV 28 0
30 [KRL2001] 35 X 03 46 35.66 +24 07 52.8           ~ 1 0
31 V* V448 Tau Y*O 03 46 35.9117232840 +23 58 01.275542652   15.42 14.02     M1.5 59 0
32 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
33 [KRL2001] 33 X 03 46 38.80 +23 58 05.1           ~ 1 0
34 HD 23511 PM* 03 46 39.3335012425 +24 06 11.531508492   9.75 9.28   8.75 F5V 144 0
35 V* V814 Tau BY* 03 46 39.3864483531 +24 01 46.867039992   13.04 12.13   11.24 K3V 122 0
36 [KRL2001] 30 X 03 46 40.99 +24 07 46.3           ~ 1 0
37 [KRL2001] 29 X 03 46 41.29 +24 04 26.0           ~ 1 0
38 [KRL2001] 28 X 03 46 41.94 +24 03 51.2           ~ 1 0
39 Cl* Melotte 22 DH 467 Er* 03 46 43.5895860823 +23 59 42.497999718   17.667 16.120   13.771 M2.8 57 0
40 [KRL2001] J034643.64+240120.57 X 03 46 43.64 +24 01 20.6           ~ 1 0
41 [KRL2001] 26 X 03 46 44.29 +23 59 11.5           ~ 1 0
42 [KRL2001] J034646.01+240503.26 X 03 46 46.01 +24 05 03.3           ~ 1 0
43 [KRL2001] 25 X 03 46 46.71 +24 07 57.6           ~ 1 0
44 [KRL2001] 24 X 03 46 47.23 +24 01 28.9           ~ 1 0
45 [KRL2001] J034648.08+240334.63 X 03 46 48.08 +24 03 34.6           ~ 1 0
46 [KRL2001] 23 X 03 46 48.54 +24 00 40.6           ~ 1 0
47 [KRL2001] J034649.03+240003.47 X 03 46 49.03 +24 00 03.5           ~ 1 0
48 [KRL2001] 22 X 03 46 49.13 +24 08 33.5           ~ 1 0
49 [KRL2001] 21 PM* 03 46 51.4282819008 +24 06 16.285800132           ~ 19 0
50 [KRL2001] 20 X 03 46 51.97 +24 00 04.6           ~ 1 0
51 [KRL2001] 19 X 03 46 53.05 +23 56 55.2           ~ 1 0
52 Cl* Melotte 22 MHO 8 Er* 03 46 53.9572109375 +24 07 57.243630147     18.92     MV 31 0
53 Cl* Melotte 22 DH 478 LM* 03 46 55.3101893022 +24 11 16.777819565     19.02   15.68 MV 38 0
54 [KRL2001] 16 X 03 46 55.63 +24 02 56.9           ~ 1 0
55 [KRL2001] 15 X 03 46 55.74 +24 01 52.7           ~ 1 0
56 [KRL2001] J034657.40+241307.10 X 03 46 57.40 +24 13 07.1           ~ 1 0
57 2MASS J03465825+2401415 Er* 03 46 58.2568973467 +24 01 41.478164358           M5 29 0
58 Cl* Melotte 22 DH 484 Er* 03 46 59.3116640184 +24 01 42.916021104   19.90 17.60   14.40 M4.1 51 0
59 [KRL2001] J034659.54+240421.01 X 03 46 59.54 +24 04 21.0           ~ 1 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 Y*O 03 47 03.5824795963 +24 09 34.870154100   15.93 14.58   12.72 M2.4 89 0
65 V* V1210 Tau gD* 03 47 04.2131220000 +23 59 42.773483436   8.67 8.38   8.02 F0V 138 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 Er* 03 47 09.1825214756 +24 03 07.822324545   18.33 16.52     ~ 43 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 SB* 03 47 16.5764110218 +24 07 41.906506002   9.15 8.72   8.09 F3V 92 0
72 [KRL2001] 3 X 03 47 16.98 +24 12 33.7           ~ 1 0
73 V* V646 Tau Y*O 03 47 18.147480 +24 02 11.34420   15.35 14.03 13.69 12.14 M1.5Ve 57 0
74 [KRL2001] J034722.49+240009.89 X 03 47 22.49 +24 00 09.9           ~ 1 0
75 2MASS J03472534+2402570 Y*O 03 47 25.3424655936 +24 02 56.964658812     16.1   13.79 M3.1 45 0
76 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
77 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
78 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
79 VB 10 PM* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 499 1

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