2002AJ....124.2083B

Query : 2002AJ....124.2083B

2002AJ....124.2083B - Astron. J., 124, 2083-2092 (2002/October-0)

Spectroscopic survey of the galactic open cluster NGC 6871. I. New emission-line stars.

BALOG Z. and KENYON S.J.

Abstract (from CDS):

We analyze spectra of 44 emission-line stars detected in a low-resolution optical spectroscopic survey of the galactic open cluster NGC 6871. The survey of 1217 stars is complete to V=14.9 and includes stars with V<16.5 between the zero-age main sequence and the 107 yr pre-main-sequence (PMS) isochrone. Of the 44 emission-line stars in this survey, 28 show obvious emission in Hα and 16 have weak Hα absorption (compared with Hγ). We use the reddening to separate foreground and background stars from the cluster members; the position in the HR diagram or the presence of forbidden emission lines ([N II] and [S II]) then yields the evolutionary status of the emission-line stars. A comparison of the Hα spectral index distribution in NGC 6871 with the distribution of young stars in the Taurus-Auriga molecular cloud indicates that the late-type PMS stars in our sample may be weak-line T Tauri stars. Many of these stars show [S II] (36%) and [N II] (45%) emission.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual (NGC 6871) - stars: emission line, Be

CDS comments: Tables 2 and 3 : numbering in column 1 not used in SIMBAD.

Simbad objects: 49

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Number of rows : 49
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 Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
2 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
3 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
4 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0
5 2MASS J19594826+3521428 * 19 59 48.2652438672 +35 21 42.905948328   16.3 15.92     G0: 2 0
6 [MJD95] J195957.80+351908.6 * 19 59 57.89 +35 19 08.7   16.35 15.88     F7 2 0
7 [MJD95] J200000.73+352316.3 * 20 00 00.82 +35 23 16.4   15.48 15.02     A3 2 0
8 2MASS J20000277+3518558 * 20 00 02.7730791840 +35 18 55.986071544   15.92 16.03     F8: 2 0
9 2MASS J20000637+3514025 * 20 00 06.3797581536 +35 14 02.612111496   15.61 14.79     G5 2 0
10 2MASS J20040859+3550063 * 20 04 08.5814545224 +35 50 06.376449768   15.69 15.63     F8 2 0
11 [MJD95] J200418.58+355426.0 * 20 04 18.67 +35 54 26.1   13.47 13.02     A0 2 0
12 HD 227480 * 20 04 35.7638701416 +35 34 59.548444500   9.34 9.29     A3II 18 0
13 Cl* NGC 6871 BP 3 * 20 04 44.9858643816 +35 44 42.852277248   12.66 12.75     B8Ve 8 0
14 2MASS J20045329+3536466 * 20 04 53.2857100776 +35 36 46.665740628   15.12 14.70     A0 2 0
15 Cl* NGC 6871 BP 2 * 20 04 54.0303292800 +35 51 21.540468888   11.85 11.98     B5Ve 5 0
16 2MASS J20050833+3537085 * 20 05 08.3340044664 +35 37 08.534554752   14.23 13.98     G1 2 0
17 2MASS J20051290+3551133 * 20 05 12.90 +35 51 13.4   13.27 13.13     B5 2 0
18 2MASS J20051931+3542226 * 20 05 19.3160256096 +35 42 22.688806968   14.79 14.35     A7 4 0
19 2MASS J20052200+3537197 * 20 05 22.0009432320 +35 37 19.716506724   14.03 13.83     A1 4 0
20 ZTF J200522.06+354212.0 RS* 20 05 22.0693086192 +35 42 12.100837356   15.27 14.40     G9 4 0
21 2MASS J20052952+3545516 * 20 05 29.5194301008 +35 45 51.679792080   14.86 14.31     F1 3 0
22 2MASS J20053214+3538089 * 20 05 32.14 +35 38 08.9   16.3 15.95     F8: 2 0
23 2MASS J20054447+3553523 * 20 05 44.4744147624 +35 53 52.342590624   14.57 14.34     A2 4 0
24 HD 227611 Be* 20 05 45.1471495080 +35 54 02.992953780 8.30 9.06 8.80     B1:III/Ve 74 0
25 2MASS J20054776+3538113 * 20 05 47.7606009336 +35 38 11.350570128   11.97 11.91     B8 5 0
26 HD 190919 * 20 05 56.1608742336 +35 40 19.500552228 6.86 7.54 7.29     B0.7II 94 0
27 2MASS J20055665+3542296 * 20 05 56.6503029456 +35 42 29.720319084   15.85 15.75     F9 2 0
28 HD 190918 WR* 20 05 57.3244526328 +35 47 18.150756792 6.11 6.88 6.75     WN5+O9I 385 0
29 [MJD95] J200557.85+354721.1 * 20 05 57.8289108096 +35 47 21.251936148 12.09 12.16 11.93     B4 17 0
30 BD+35 3955 s*b 20 05 58.7111729640 +35 47 49.882613028 6.99 7.63 7.38     B0.7Iab 117 0
31 2MASS J20055952+3551384 * 20 05 59.53 +35 51 38.4   15.15 14.81     F6 2 0
32 BD+35 3956 * 20 05 59.9769600768 +35 45 44.419567680 8.42 9.01 8.86     B0.5Vne 49 0
33 NGC 6871 OpC 20 06 07.9 +35 46 45   5.43 5.2     ~ 237 0
34 [MJD95] J200608.03+354011.6 * 20 06 08.12 +35 40 11.7   15.48 15.31     F8 2 0
35 2MASS J20060856+3534578 LP? 20 06 08.5757006328 +35 34 57.947573712   14.99 13.02     M5: 3 0
36 [MJD95] J200613.34+355244.8 * 20 06 13.43 +35 52 44.9   15.55 15.24     A5: 2 0
37 2MASS J20061504+3541021 * 20 06 15.05 +35 41 02.1   14.77 14.41     A9 2 0
38 ZTF J200619.30+355545.8 BY* 20 06 19.3073999634 +35 55 46.254646253   15.535 14.049 13.815   K8 4 0
39 2MASS J20062117+3556003 * 20 06 21.1708499952 +35 56 00.365590968   15.47 14.42     K8 2 0
40 2MASS J20062205+3548479 * 20 06 22.0518330912 +35 48 47.988675252   15.06 14.83     A0 2 0
41 [MJD95] J200631.73+353609.9 * 20 06 31.82 +35 36 10.0   15.69 15.37     F9 2 0
42 [MJD95] J200656.29+354947.8 * 20 06 56.38 +35 49 47.8   15.62 16.47     F2 2 0
43 Ass Cyg OB 3 As* 20 07 +35.9           ~ 190 0
44 HD 227733 Em* 20 07 00.9389267952 +35 40 06.286359180 10.11 10.59 10.38     B 19 0
45 2MASS J20070593+3551107 * 20 07 05.9373113112 +35 51 10.789984980   15.37 14.08     K2 2 0
46 2MASS J20071179+3538533 * 20 07 11.7947641368 +35 38 53.328662376   13.63 13.47     B6 2 0
47 2MASS J20071432+3553222 * 20 07 14.3245278240 +35 53 22.234812540   15.39 15.18     F7 2 0
48 2MASS J20072535+3536344 * 20 07 25.3294311936 +35 36 34.028890596   16.44 16.15     A2 2 0
49 EM* VES 152 Em* 20 07 28.7606599968 +35 46 33.026029932 11.7 12.24 11.77     B6 9 0

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