2005A&A...440..511S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET07:36:18

2005A&A...440..511S - Astronomy and Astrophysics, volume 440, 511-522 (2005/9-3)

NGC 146: a young open cluster with a Herbig Be star and intermediate mass pre-main sequence stars.

SUBRAMANIAM A., SAHU D.K., SAGAR R. and VIJITHA P.

Abstract (from CDS):

We present UBV CCD photometry and low-resolution spectra of stars in the field of the young open cluster NGC 146. UBV photometry of 434 stars were used to estimate the E(B-V) reddening of 0.55±0.04mag and BV photometry of 976 stars were used to estimate a distance modulus of (m-M)0=12.7±0.2mag, corresponding to a distance of 3470+335–305pc. We estimated 10-16Myr as the turn-off age for the upper main sequence of the cluster using isochrones and synthetic colour magnitude diagrams. We identified two B type stars with Hα in emission and located on the MS using slit-less spectra. A higher resolution spectrum of the brighter Be star indicated the presence of a number of emission lines, with some lines showing the signature of gas infall. This star was found to be located in the region of Herbig Ae/Be stars in the (J-H) vs. (H-K) colour-colour diagram. Thus, we identify this star as a Herbig Be star. On the other hand, 54 stars were found to show near infrared excess, of which 17 were found to be located in the region of Herbig Ae/Be stars and 18 stars were found to be located in the region of Be stars in the NIR colour-colour diagram. Thus NGC 146 is a young cluster with a large number of intermediate mass pre-main sequence stars. The turn-on age of the cluster is found to be ∼3Myr. Though NGC 146 shows an older turn off, the bulk of stars in this cluster seems to belong to the younger population of 3Myr.

Abstract Copyright:

Journal keyword(s): Galaxy: open cluster and associations: individual: NGC 146 - stars: emission-line, Be - stars: Hertzsprung-Russell (HR) and C-M diagrams - stars: pre-main sequence

Nomenclature: Table 2: Cl* NGC 146 SSS SN (Nos S1-S2), Cl* NGC 146 SSS NN (Nos 1-20).

Simbad objects: 37

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Number of rows : 37

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 C 0029+628 OpC 00 32 03 +63 10.9   9 8.5     ~ 32 0
2 Cl* NGC 146 SSS 20 * 00 32 35.2921218462 +63 16 37.898541672   16.17 14.41     ~ 1 0
3 Cl* NGC 146 SSS 1 * 00 32 43.6522683632 +63 20 49.859757284   15.15 13.21     ~ 1 0
4 EM* GGR 190 Be* 00 32 44.5592260404 +63 18 16.749200419 11.38 11.61 11.09     B8Iae 12 0
5 Cl* NGC 146 SSS 17 * 00 32 45.9190798923 +63 15 58.087418676   15.50 14.91     ~ 2 0
6 Cl* NGC 146 SSS 19 * 00 32 46.4993809938 +63 20 31.628527026   15.78 14.90     ~ 1 0
7 Cl* NGC 146 SSS 4 * 00 32 53.3747248383 +63 17 24.902529512   14.25 13.76     ~ 1 0
8 Cl* NGC 146 SSS 5 * 00 32 58.5653100072 +63 16 55.730634425   14.09 13.64     ~ 1 0
9 Cl* NGC 146 SSS 2 * 00 33 00.5207820926 +63 21 29.011801197   15.43 14.45     ~ 1 0
10 Cl* NGC 146 SSS 3 * 00 33 02.1373973033 +63 20 39.224511217   14.5 13.79     ~ 1 0
11 Cl* NGC 146 SSS 12 * 00 33 05.9430857585 +63 16 04.908222095   14.67 14.02     ~ 1 0
12 NGC 146 OpC 00 33.1 +63 18   9.59 9.1     ~ 50 0
13 Cl* NGC 146 SSS 6 * 00 33 08.3645317845 +63 17 04.396471697   15.07 14.49     ~ 1 0
14 Cl* NGC 146 SSS 13 * 00 33 09.5155047651 +63 14 38.602984055   15.73 14.32     ~ 1 0
15 Cl* NGC 146 SSS 10 * 00 33 15.180 +63 18 26.87   13.66 13.22     ~ 1 0
16 Cl* NGC 146 SSS 15 * 00 33 16.8809235644 +63 16 38.206597929   14.31 12.77     ~ 1 0
17 Cl* NGC 146 SSS 11 * 00 33 17.1798066663 +63 16 14.496264778   14.14 13.53     ~ 1 0
18 Cl* NGC 146 SSS 9 * 00 33 17.7927000197 +63 17 28.392784341   13.76 13.30     ~ 1 0
19 Cl* NGC 146 SSS S2 Be* 00 33 18.2195127693 +63 18 38.106387051   14.04 13.65     B5-7Ve 4 0
20 Cl* NGC 146 SSS 8 * 00 33 21.4790040778 +63 16 46.887957963   14.11 13.64     ~ 1 0
21 Cl* NGC 146 SSS 14 * 00 33 23.7221992038 +63 16 15.954696252   15.42 14.80     ~ 1 0
22 Cl* NGC 146 SSS 18 * 00 33 27.5349023809 +63 16 20.367593282   15.76 15.04     ~ 1 0
23 Cl* NGC 146 SSS 16 * 00 33 30.4403338729 +63 15 56.415213187   15.86 14.77     ~ 1 0
24 M 103 OpC 01 33 23 +60 39.0   7.72 7.4     ~ 186 0
25 NGC 663 OpC 01 46 09 +61 14.1   7.78 7.1     ~ 236 0
26 NGC 869 OpC 02 19 00 +57 07.7           ~ 430 0
27 NGC 884 OpC 02 22 23 +57 07.5           ~ 448 0
28 NAME Per Arm PoG 03 30 +45.0           ~ 1278 0
29 V* XY Per Ae* 03 49 36.3362509899 +38 58 55.551266650 12.12 10.14 9.58 9.54 8.40 A2II+B6 142 0
30 [CAR83] PP 13N ** 04 10 41.7 +38 08 09           ~ 6 1
31 NGC 4755 OpC 12 53 39 -60 21.7           ~ 268 0
32 EM* AS 220 Ae* 17 10 08.1238 -27 15 18.801 12.86 12.79 12.22 12.03 10.82 A6Ve+G5Ve 129 0
33 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 944 2
34 IC 4996 OpC 20 16 30 +37 38.0           ~ 163 0
35 NGC 7419 OpC 22 54 20 +60 48.9     13.0     ~ 87 0
36 NGC 7510 OpC 23 11.0 +60 34   8.77 7.9     ~ 88 1
37 Cl Mrk 50 OpC 23 15 15 +60 26.0   9.09 8.5     ~ 45 0

    Equat.    Gal    SGal    Ecl

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2020.10.28-07:36:18

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