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High-resolution Near-infrared Observations of a Small Cluster Associated with a Bright-rimmed Cloud in W5

Imai, Rieko, Sugitani, Koji, Miao, Jingqi, Fukuda, Naoya, Watanabe, Makoto, Kusune, Takayoshi, Pickles, Andrew J. (2017) High-resolution Near-infrared Observations of a Small Cluster Associated with a Bright-rimmed Cloud in W5. The Astrophysical Journal, 845 (2). Article Number 99. ISSN 0004-637X. E-ISSN 1538-4357. (doi:10.3847/1538-4357/aa7fb5) (KAR id:63574)

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We have carried out near-infrared (IR) observations to examine star formation toward the bright-rimmed cloud SFO 12, of which the main exciting star is O7V star in W5-W. We found a small young stellar object (YSO) cluster of six members embedded in the head of SFO 12 facing its exciting star, aligned along the UV radiation incident direction from the exciting star. We carried out high-resolution near-IR observations with the Subaru adaptive optics (AO) system and revealed that three of the cluster members appear to have circumstellar envelopes, one shows an arm-like structure in its envelope. Our near-IR and L?-band photometry and Spitzer IRAC data suggest that formation of two members at the tip side occurred in advance of other members toward the central part, under our adopted assumptions. Our near-IR data and previous studies imply that more YSOs are distributed in the region just outside the cloud head on the side of the main exciting star, but there is little sign of star formation toward the opposite side. We infer that star formation has been sequentially occurring from the exciting star side to the central part. We examined archival data of far-infrared and CO (J = 3-2) which reveals that, unlike in the optical image, SFO 12 has a head-tail structure which is along the UV incident direction. This suggests that SFO 12 is affected by strong UV from the main exciting star. We discuss the formation of this head-tail structure and star formation there by comparing with a radiation-driven implosion (RDI) model.

Item Type: Article
DOI/Identification number: 10.3847/1538-4357/aa7fb5
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: J. Miao
Date Deposited: 26 Sep 2017 11:07 UTC
Last Modified: 16 Feb 2021 13:48 UTC
Resource URI: (The current URI for this page, for reference purposes)
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