2001A&A...366..817B

Query : 2001A&A...366..817B

2001A&A...366..817B - Astronomy and Astrophysics, volume 366, 817-826 (2001/2-2)

A search for peculiar objects in young open clusters. I. New emission line and late spectral type stars in NGC 6871.

BERNABEI S. and POLCARO V.F.

Abstract (from CDS):

We present the first results of a search in young open clusters for stars of very high initial mass, carried out by means of slitless spectroscopy. A deep (R≃17) survey of the open cluster NGC 6871 reveals many new objects of late spectral type, including an S star, as well as three new emission line stars, which are classified as Be stars. The already known Be star HD 227733 is surrounded by a previously undetected reflection nebula. The star VES 145, classified as an emission line object, is actually a late-type star, without any emission feature. We argue that VES 145 is a young RSG of a very high mass (M0≃25M☉) and a cluster member.

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Journal keyword(s): stars: early types - stars: emission-line, Be - stars: evolution - stars: individual (HD 227733, VES 145) - stars: late-type

Nomenclature: Tables 2, 3: Cl* NGC 6871 BP N (Nos 1-9).

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Cl* NGC 6871 BP 3 * 20 04 44.9858643816 +35 44 42.852277248   12.66 12.75     B8Ve 8 0
2 Cl* NGC 6871 BP 4 LP? 20 04 50.0621552520 +35 54 33.243773832     14.0     M3.5III 2 0
3 Cl* NGC 6871 BP 2 * 20 04 54.0303292800 +35 51 21.540468888   11.85 11.98     B5Ve 5 0
4 Cl* NGC 6871 BP 6 * 20 05 31.5909272345 +35 53 55.778144793     12.9     ~ 2 0
5 Cl* NGC 6871 BP 8 * 20 05 34.8338637000 +35 36 07.196451624   14.41 14.15     ~ 3 0
6 HD 227611 Be* 20 05 45.1471495080 +35 54 02.992953780 8.30 9.06 8.80     B1:III/Ve 71 0
7 HD 190918 WR* 20 05 57.3244526328 +35 47 18.150756792 6.11 6.88 6.75     WN5+O9I 369 0
8 NGC 6871 OpC 20 06 11.5 +35 45 54   5.43 5.2     ~ 225 0
9 Cl* NGC 6871 BP 9 * 20 06 12.7236797760 +35 47 25.584341244           M: 1 0
10 Cl* NGC 6871 BP 1 LP? 20 06 47.4727113120 +35 41 47.240263896     16.0     B:e 2 1
11 Cl* NGC 6871 BP 7 * 20 06 49.6323460056 +35 52 23.965695120   14.55 12.34     M: 2 0
12 MSX6C G072.6158+01.8150 s*r 20 06 53.9896531296 +35 37 26.724552312     11.765 11.110   M0I 4 0
13 HD 227733 Em* 20 07 00.9389267952 +35 40 06.286359180 10.11 10.59 10.38     B 17 0
14 IRAS 20051+3531 S* 20 07 04.0553865744 +35 40 11.134390152     16.0     S 8 0
15 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 798 0

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