2008MNRAS.384.1675J


Query : 2008MNRAS.384.1675J

2008MNRAS.384.1675J - Mon. Not. R. Astron. Soc., 384, 1675-1700 (2008/March-2)

Stellar contents and star formation in the young open cluster Stock 8.

JOSE J., PANDEY A.K., OJHA D.K., OGURA K., CHEN W.P., BHATT B.C., GHOSH S.K., MITO H., MAHESWAR G. and SHARMA S.

Abstract (from CDS):

We present UBVIc CCD photometry of the young open cluster Stock 8 with the aim of studying its basic properties such as the amount of interstellar extinction, distance, age, stellar contents and initial mass function (IMF). We also studied the star formation scenario in this region. From optical data, the radius of the cluster is found to be ∼6 arcmin (∼3.6 pc) and the reddening within the cluster region varies from E(B - V) = 0.40 to 0.60 mag. The cluster is located at a distance of 2.05±0.10 kpc. Using Hα slitless spectroscopy and Two Micron All Sky Survey (2MASS) near-infrared (NIR) data we identified Hα emission and NIR-excess young stellar objects (YSOs), respectively. From their locations in the colour-magnitude diagrams, majority of them seem to have ages between 1 and 5 Myr. The spread in their ages indicate a possible non-coeval star formation in the cluster. Massive stars in the cluster region reveal an average age of ≤2 Myr. In the cluster region (r ≤ 6 arcmin) the slope of the mass function (MF), Γ, in the mass range ∼1.0 ≤ M/M< 13.4 can be represented by a power law having a slope of -1.38±0.12, which agrees well with Salpeter value (-1.35). In the mass range 0.3 ≤ M/M < 1.0, the MF is also found to follow a power law with a shallower slope of Γ = -0.58±0.23 indicating a break in the slope of the IMF at ∼1 M. The slope of the K-band luminosity function for the cluster (r ≤ 6 arcmin) is found to be 0.31±0.02, which is smaller than the average value (∼0.4) obtained for embedded star clusters.

A significant number of YSOs are distributed along a Nebulous Stream towards the east side of the cluster. A small cluster is embedded in the Nebulous Stream. The YSOs lying in the Nebulous Stream and in the embedded cluster are found to be younger than the stars in the cluster Stock 8. The radio continuum, MSX, IRAS mid- and far-infrared maps and the ratio of [Sii]/Hα intensities indicate that the eastern region of Stock 8 is ionization bounded whereas the western region is density bounded. The morphology seems to indicate that the ionization/shock front caused by the ionizing sources located in the Stock 8 region and westwards of Stock 8 has not reached the Nebulous Stream. It appears that star formation activity in the Nebulous Stream and embedded cluster may be independent from that of Stock 8.


Abstract Copyright: 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): stars: formation - stars: luminosity function, mass function - stars: pre-main-sequence - open clusters and associations: individual: Stock 8

VizieR on-line data: <Available at CDS (J/MNRAS/384/1675): table2.dat>

Nomenclature: Table 2: Cl* Stock 8 JPO NNNN (Nos 1-7924). Table 4: Cl* Stock 8 JPOHA NN (Nos 1-25). Table 6: [JPO2008] IC 417 NN (Nos 1-13).

Simbad objects: 59

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Number of rows : 59
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl Berkeley 59 OpC 00 02 14 +67 25.0           ~ 76 0
2 SA 92- reg 00 55 03.80 +00 47 13.2           ~ 98 0
3 NAME Per Arm PoG 03 30 +45.0           ~ 1317 0
4 IC 348 OpC 03 44 34 +32 09.8           ~ 1259 1
5 NGC 1893 OpC 05 22 44 +33 24.7   7.90 7.5     ~ 238 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15463 1
7 HD 281151 * 05 27 05.6601580301 +34 19 31.563367775 8.9 9.59 9.48     B2 16 0
8 HD 281150 * 05 27 15.9348004493 +34 25 43.501184191 9.24 9.73 9.61     B2 14 0
9 LS V +34 12 * 05 27 16.7827162570 +34 30 56.829577032 10.72 11.16 10.98     B2V 11 0
10 LS V +34 15 * 05 27 23.2957273015 +34 23 40.538400034 9.76 10.31 10.06     O5.5V((f)) 12 0
11 LS V +34 18 * 05 27 29.3190627582 +34 25 02.618882274 10.36 10.68 10.01     O8V 8 0
12 LS V +34 21 * 05 27 33.4053792102 +34 27 01.832116849 11.57 11.6 10.9     O9IV 11 0
13 HD 35633 * 05 27 43.2840745391 +34 31 56.677917237 7.7 8.32 8.09     B0.5IV 48 0
14 2MASS J05275993+3424400 Y*O 05 27 59.9345304685 +34 24 40.034809512     19.522   17.794 ~ 1 0
15 NAME Stock 8 Nebulous Stream GNe 05 28.0 +34 23           ~ 1 1
16 2MASS J05280038+3425573 Y*O 05 28 00.3877283106 +34 25 57.353637154   20.087 18.493   16.463 ~ 1 0
17 IC 417 HII 05 28 03 +34 24.7           ~ 51 0
18 2MASS J05280458+3421504 Y*O 05 28 04.5835070462 +34 21 50.554348924   16.603 15.642   14.437 ~ 2 0
19 2MASS J05280565+3425274 Y*O 05 28 05.6623521416 +34 25 27.579425727     17.108   15.330 ~ 1 0
20 Cl* Stock 8 JPOHA 4 Y*O 05 28 06.09 +34 24 55.4     18.084   16.624 ~ 1 0
21 BD+34 1053 * 05 28 06.1174332543 +34 27 22.001357647 10.92 11.19 10.92     B1.5V 9 0
22 TYC 2411-728-1 * 05 28 06.3661 +34 25 00.795   11.60 11.43     B1V 1 0
23 2MASS J05280683+3424490 Y*O 05 28 06.8354694193 +34 24 49.090626913   15.770 14.800   13.515 ~ 2 0
24 BD+34 1054 ** 05 28 07.1536 +34 25 26.870 8.36 10.15 10.01     O9.5V 35 0
25 C 0524+343 OpC 05 28 07.5 +34 25 42           ~ 63 0
26 LS V +34 30 ** 05 28 08.231 +34 25 14.45 10.51     11.08   B1V 8 0
27 BD+34 1056 * 05 28 08.3766538740 +34 23 45.245016786 9.38 10.06 9.87     B0.5V 11 0
28 2MASS J05280858+3425384 Y*O 05 28 08.5883720461 +34 25 38.406499486   17.918 16.700   14.888 ~ 1 0
29 2MASS J05281602+3427280 Y*O 05 28 16.0174461682 +34 27 28.168701509   19.663 18.284   16.159 ~ 1 0
30 2MASS J05281706+3428032 Y*O 05 28 17.0712239333 +34 28 03.326051741   16.814 15.565   13.997 ~ 1 0
31 2MASS J05281815+3416519 Y*O 05 28 18.16 +34 16 52.0   17.630 16.486   15.149 ~ 1 0
32 2MASS J05282585+3423096 Y*O 05 28 25.8473924961 +34 23 09.627190975   17.319 16.467   15.306 ~ 1 0
33 2MASS J05283492+3426019 Y*O 05 28 34.9172963922 +34 26 01.961571277     20.352   18.112 ~ 1 0
34 2MASS J05283579+3424319 Y*O 05 28 35.7936513243 +34 24 32.068035423   16.523 15.267   13.573 ~ 1 0
35 Cl* Stock 8 JPOHA 14 Y*O 05 28 39.38 +34 24 33.2     18.892   16.912 ~ 1 0
36 BD+34 1058 * 05 28 39.4051594939 +34 40 08.728124803 8.31 8.99 8.84     O8nn 39 0
37 2MASS J05283986+3424394 Y*O 05 28 39.8598328290 +34 24 39.471132965     19.423   17.575 ~ 1 0
38 2MASS J05284605+3424077 Y*O 05 28 46.0484797874 +34 24 07.660583133     21.147   18.728 ~ 1 0
39 2MASS J05284668+3422188 Y*O 05 28 46.6801303002 +34 22 18.976615020     19.751   17.923 ~ 1 0
40 2MASS J05284807+3424097 Y*O 05 28 48.0822343799 +34 24 09.749457591     17.777   16.354 ~ 1 0
41 2MASS J05284955+3423269 Y*O 05 28 49.5550930549 +34 23 26.891678590     17.658   15.410 ~ 1 0
42 2MASS J05285322+3423353 Y*O 05 28 53.2294307824 +34 23 35.313668746     19.581   16.994 ~ 1 0
43 2MASS J05285605+3423004 Y*O 05 28 56.0502195254 +34 23 00.399334428     16.876   14.921 ~ 1 0
44 Cl* Stock 8 JPOHA 22 Y*O 05 28 58.48 +34 23 10.2     18.579   16.140 ~ 1 0
45 [IBP2002] CC14 Gl? 05 28 59 +34 23.2           ~ 7 0
46 2MASS J05290331+3424136 Y*O 05 29 03.3091943165 +34 24 13.720078067     19.792   17.216 ~ 1 0
47 2MASS J05290968+3423315 Y*O 05 29 09.68 +34 23 31.6     18.000   15.713 ~ 1 0
48 EM* GGA 339 Y*O 05 29 19.1398560313 +34 17 47.248783787   12.96 12.59 12.59   B_ 5 0
49 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 245 0
50 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1514 1
51 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 511 0
52 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 505 0
53 NGC 2362 OpC 07 18 41 -24 57.3           ~ 367 0
54 NAME Upper Sco Association As* 16 12 -23.4           ~ 1114 1
55 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3197 1
56 HH 399 HH 18 02 28.9 -23 04 00           ~ 27 0
57 M 20 OpC 18 02 42 -22 58.3           ~ 406 1
58 NGC 6530 OpC 18 04 31 -24 21.5           ~ 364 0
59 NAME Norma-Cygnus Arm reg ~ ~           ~ 76 0

    Equat.    Gal    SGal    Ecl

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2021.07.27-11:04:12

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