2002A&A...381..168B


Query : 2002A&A...381..168B

2002A&A...381..168B - Astronomy and Astrophysics, volume 381, 168-177 (2002/1-1)

Cometary molecular clouds around RNO6. On-going star formation near the double cluster h and χ Persei.

BACHILLER R., FUENTE A. and KUMAR M.S.N.

Abstract (from CDS):

We present molecular line observations of the star-forming cloud around RNO6 along with a newly discovered nearby molecular cloud that we name RNO6NW. Both clouds display striking similarities in their cometary structures and overall kinematics. By using 13CO line observations, we estimate that these clouds have similar sizes (∼4.5pc) and masses (∼200M). Both molecular clouds RNO6 and RNO6NW are active in star formation. From new high resolution near-IR narrowband images, we confirm that RNO6 hosts an embedded IR cluster that includes a Herbig Be star. A conspicuous H2 filament is found to delineate the dense cometary head of the globule. RNO6NW hosts at least two IR sources and a bipolar molecular outflow of ∼0.9pc of length and ∼0.5M of mass. We show that the cometary structure of both clouds has been created by the UV radiation from numerous OB stars lying ∼1.5° to the north. Such OB stars are associated with the double cluster h and χ Persei, and are probably members of the PerOB1 association. Thus star formation inside these clouds has been very likely triggered by the Radiation Driven Implosion (RDI) mechanism. From comparison to RDI theoretical models, we find that the similar kinematics and morphology of both clouds is well explained if they are at a re-expansion phase. Triggered sequential star formation also explains the observed spatial distribution of the members of the near-IR cluster inside the RNO6 cloud, and the morphology of the H2 filament. We conclude that the RNO6 and RNO6NW clouds are high-mass counterparts to the cometary globules of smaller masses which have been studied up to now. Thus our observations demonstrate that the RDI mechanism can produce, not only low mass stars in small globules, but also intermediate mass stars and clusters in massive clouds.

Abstract Copyright:

Journal keyword(s): stars: formation - interstellar medium: individual objects: RNO 6 - interstellar medium: jets and outflows - interstellar medium: molecules

Nomenclature: NAME RNO 6 MCld, NAME RNO 6NW MCld. Fig.2: [BFK2002] N (Nos 1-5), [BFK2002] A (No. F).

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 13268 * 02 11 29.7003301008 +56 09 31.721738760 7.48 8.24 8.18     ON8.5IIIn 169 0
2 HD 13669 Be* 02 15 02.6064837624 +55 47 35.598050808 7.84 8.25 7.90     B3IV-V 59 0
3 HD 13745 bC* 02 15 45.9350391312 +55 59 46.727495484 7.22 7.99 7.90     O9.7II(n) 165 1
4 NAME RNO 6NW MCld MoC 02 15 57.1 +55 28 12           A5 4 0
5 NAME RNO 6 MCld MoC 02 16 30 +55 23.1           ~ 1 0
6 HBC 334 Em* 02 16 30.7111817472 +55 23 00.139141680   14.92 14.32 14.52   B3 32 0
7 RNO 6 RNe 02 16 31 +55 23.0           ~ 12 0
8 HD 14014 bC* 02 18 00.0325766088 +56 13 57.341937648 8.23 8.95 8.86     B0.5V 37 0
9 NGC 869 OpC 02 18 58 +57 08.0           ~ 458 0
10 Ass Per OB 1 As* 02 21 +57.6           ~ 167 1
11 HD 14434 Em* 02 21 52.4121560832 +56 54 18.032028876 7.87 8.65 8.49 8.29 8.20 O5.5Vnn((f))p 177 0
12 NGC 884 OpC 02 22 20 +57 08.9           ~ 472 0
13 IC 1848 OpC 02 51 25 +60 25.1   6.87 6.5     ~ 473 2
14 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 698 1
15 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1291 0
16 2MASS J08254384-5100326 Y*O 08 25 43.85 -51 00 32.7           ~ 309 1
17 HH 47 HH 08 25 44.30 -51 00 26.2           ~ 244 0

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2022.11.28-11:54:44

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