2011MNRAS.415.1355A

Query : 2011MNRAS.415.1355A

2011MNRAS.415.1355A - Mon. Not. R. Astron. Soc., 415, 1355-1365 (2011/August-1)

Early-type stars in the open cluster NGC 4852.

AHUMADA J.A., GIORGI E.E., SOLIVELLA G. and VAZQUEZ R.A.

Abstract (from CDS):

The southern open cluster NGC 4852 was re-observed in the UBVRI passbands to refine its intrinsic fundamental parameters. An extended spectral coverage was also undertaken aimed at obtaining a clear picture of the kind of stars inhabiting the cluster upper main sequence. We detected an unusual number of B-type stars including a new weak-emission Be star that raises to three the number of confirmed emission objects known in the cluster area. Our analysis, however, is conclusive in that none of them belongs to the cluster. With the new data set, we improved the fundamental parameters of NGC 4852: it is little bit farther than formerly assumed; the reddening, which increases smoothly with the distance, is lower than early estimates; and more importantly, it is really a young object of nearly 40-60 Myr, contrary to the age of 200 Myr stated before. By means of spectroscopic parallaxes we secured the star distances, finding a good agreement between spectroscopic and zero-age main-sequence fitting distances, within the errors. The spatial distribution of the stars allows us to infer that NGC 4852 is the final, closer to the Sun, structure of a star-forming region and that a distant group of early-B-type stars, located immediately beyond the cluster, seems to be part of an extended OB association. The three emission stars detected in the region are related to this farther group. Finally, two extremely faint and blue stars were also found in the cluster zone. They have no connection with NGC 4852 but seem to be white-dwarf candidates.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: early-type - stars: emission-line, Be - open clusters and associations: general - open clusters and associations: individual: NGC 4852 - Galaxy: structure

VizieR on-line data: <Available at CDS (J/MNRAS/415/1355): table3.dat table5.dat>

Nomenclature: Table 3: [AGS2011] NNNN (Nos 1-3329), [AGS2011] NNNNN (Nos 10001-10005).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 46

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Number of rows : 46
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 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 275 0
2 [KPR2004b] 317 OpC 12 53 01 -60 46.0           ~ 20 0
3 NGC 4755 OpC 12 53 39.2 -60 22 07           ~ 300 0
4 WRAY 15-1039 Em* 12 59 33.4062162072 -59 35 58.786799388 11.085 11.50 11.317 11.152 10.931 B5Ve 7 0
5 TYC 8660-811-1 * 12 59 37.2499310280 -59 39 56.790493056 10.822 10.65 10.104     F0V 7 0
6 CD-58 4833 * 12 59 38.2523042640 -59 32 58.870997088 10.618 10.77 10.619 10.477 10.275 B8Vp 14 0
7 TYC 8660-739-1 * 12 59 41.6539143144 -59 34 34.681178892 12.204 11.92 11.958 11.801 11.529 B8V 9 0
8 TYC 8660-929-1 * 12 59 42.5334593688 -59 37 35.090238288 11.738 12.02 11.773 11.585 11.362 B3Vp 9 0
9 2MASS J12595301-5935448 * 12 59 53.0080850592 -59 35 44.841647436 12.576 12.523 12.227 12.065 11.837 B9V 5 0
10 TYC 8660-328-1 * 12 59 53.0619775128 -59 35 03.327292572 12.023 11.87 11.691 11.538 11.337 B9V 4 0
11 2MASS J12595416-5936121 * 12 59 54.1615145640 -59 36 12.158247888 12.525 12.494 12.205 12.046 11.813 F0Vp 5 0
12 CD-58 4836 * 12 59 55.3030226592 -59 36 05.611901076 10.376 10.68 10.473 10.350 10.152 B7Vp 13 0
13 TYC 8660-605-1 * 12 59 55.5679702128 -59 35 51.132369696 12.167 12.32 12.042 11.886 11.686 B9V 6 0
14 CPD-58 4630 * 12 59 55.7294049912 -59 37 38.613539712 11.113 11.34 11.140 10.999 10.804 B7Vp 8 0
15 TYC 8660-985-1 * 12 59 57.8033683872 -59 38 35.254520340 13.997 13.13 11.212 10.456 9.766 K0III 4 0
16 [AGS2011] 24 * 12 59 59.9976239976 -59 36 45.979530012 15.790 13.736 11.953 10.985 10.066 K7V 1 0
17 TYC 8660-1061-1 * 13 00 03.5640000720 -59 40 31.485789156 12.596 12.32 12.098 11.926 11.699 B9V 4 0
18 TYC 8660-1111-1 * 13 00 04.3031399664 -59 34 55.474377384 12.620 12.45 11.942 11.715 11.433 A1V 7 0
19 [AGS2011] 43 * 13 00 09.0464805024 -59 38 37.522715388 15.697 14.163 12.646 11.850 11.106 M2III 1 0
20 CPD-58 4632 * 13 00 09.4836993816 -59 35 35.000091996 11.764 11.73 11.565 11.382 11.140 B8Vp 4 0
21 GSC 08660-00523 ** 13 00 09.50472 -59 37 06.5568 13.346       11.566 A0III 1 0
22 TYC 8660-337-1 * 13 00 10.9762969008 -59 33 26.825380524 12.522 12.29 12.174 11.988 11.723 B9V 9 0
23 TYC 8660-771-1 * 13 00 11.1538141128 -59 32 48.887051892 12.161 11.86 11.755 11.530 11.224 B9V 7 0
24 TYC 8660-346-1 * 13 00 11.7035735856 -59 35 39.548213664 10.808 11.06 10.85 10.683 10.491 B7V 9 0
25 NGC 4852 OpC 13 00 12.1 -59 36 25     8.9     ~ 46 0
26 TYC 8660-687-1 * 13 00 16.9458639648 -59 35 06.868528368 12.174 12.11 11.913 11.716 11.484 B9V 8 0
27 TYC 8660-1085-1 * 13 00 17.8173084312 -59 38 31.139331684 15.781 13.39 11.528 10.378 9.212 M2III 2 0
28 TYC 8660-1031-1 * 13 00 22.9343617512 -59 38 26.125185084 11.726 11.68 11.575 11.387 11.180 B5Vp 8 0
29 TYC 8660-1637-1 * 13 00 23.1693347688 -59 31 45.102797292 11.537 11.66 11.379 11.179 10.867 B3Vp 7 0
30 HD 112825 Be* 13 00 23.8918356072 -59 41 07.579683204 9.468 9.98 9.733 9.90   B1/2IV/V 44 0
31 TYC 8660-657-1 * 13 00 25.0158090984 -59 39 04.719346308 11.976 11.94 11.49 11.565 11.316 B8V 9 0
32 TYC 8660-433-1 * 13 00 28.7245319208 -59 39 23.717755836 13.562 12.57 12.617 12.180 11.718 F6V 1 0
33 TYC 8660-1638-1 * 13 00 30.0862631424 -59 31 06.728983104 15.421 13.27 11.952 11.042 10.079 G8III 4 0
34 TYC 8660-1209-1 * 13 00 33.4318493784 -59 40 51.455065728 11.572 11.71 11.699 11.492 11.220 B3V 5 0
35 HD 112852 * 13 00 34.2947415312 -59 34 51.698547084   10.14 9.91     B8/9II 20 0
36 TYC 8660-1191-1 * 13 00 37.2438164784 -59 36 53.331930648 11.896 12.35 11.978 11.812 11.593 B7Vp 5 0
37 TYC 8660-1636-1 * 13 00 39.6298204440 -59 31 03.081405900 12.343 12.35 12.001 11.806 11.429 B7III 9 0
38 CD-58 4845 Em* 13 00 45.2352861264 -59 35 53.491182288 10.059 10.58 10.379 10.41 9.992 B2Ve 16 0
39 TYC 8660-525-1 * 13 00 53.5784070840 -59 32 46.684535856 12.068 11.87 11.697 11.521 11.246 B9V 9 0
40 [AGS2011] 23 * 13 00 55.5619620168 -59 37 16.587740424 16.245 13.949 11.953 10.753 9.466 M2III 1 0
41 HD 116040 * 13 22 13.4548415400 -59 13 13.465807248   10.66 9.46     K0III 4 0
42 [AGS2011] 10005 * ~ ~ 12.131 11.913 11.566     A5Vp 1 0
43 [AGS2011] 10004 * ~ ~ 14.621 13.034 11.025     M4III 1 0
44 [AGS2011] 10001 * ~ ~ 9.828 10.017 9.775     B7III 1 0
45 [AGS2011] 10002 * ~ ~ 13.609 11.717 9.870     K2.5III 1 0
46 [AGS2011] 10003 * ~ ~ 11.895 11.876 11.025     F6V 1 0

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