Observations of star formation triggered by H ii regions
نویسندگان
چکیده
منابع مشابه
A VLA Search for Water Masers in Six H ii Regions: Tracers of Triggered Low-Mass Star Formation
We present a search for water maser emission at 22 GHz associated with young low-mass protostars in six H ii regions —M16, M20, NGC 2264, NGC 6357, S125, and S140. The survey was conducted with the NRAO Very Large Array from 2000 to 2002. For several of these H ii regions, ours are the first high-resolution observations of water masers. We detected 16 water masers: eight in M16, four in M20, th...
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Context. Statistical methods for quantifying clustering have not yet been tested against anti-clustered data. Aims. We investigate the performance of the normalised correlation length, s̄, and Q when applied to anti-clustered data. Methods. We tested the operation of s̄ on simulated data and recently published observations. Results. s̄ successfully distinguishes anticlustered data in simulations a...
متن کاملStar formation in bar environments ⋆ II . Physical properties , age and abundances of H ii regions
The nebular properties (electronic density, extinction , age, O/H abundances) of H ii regions found along the bars of the sample of barred spiral galaxies studied by Martin & Friedli (1997) are examined. From line ratio diagnostic diagrams, it is showed that regions located along the major axis of the bars have a normal photoionization spectrum, that is, line ratios reproductible from nebular c...
متن کاملTriggered Star Formation by Massive Stars
We present our diagnosis of the role that massive stars play in the formation of lowand intermediate-mass stars in OB associations (the λ Ori region, the OriOB1, and LacOB1 associations). We find that the classical T Tauri stars and Herbig Ae/Be stars tend to line up between luminous O stars and brightrimmed or comet-shaped clouds; the closer to a cloud the progressively younger they are. Our p...
متن کاملSequential star formation at the periphery of the H II regions Sh 217 and Sh 219 ⋆ ⋆ ⋆
The H regions Sh 217 and Sh 219 are textbook examples of a Strömgren sphere surrounded by an annular photodissociation region (PDR). The annular PDR is observed in both the 21 cm atomic hydrogen emission and the dust (PAH) emission near 8 μm (MSX Survey). An ultracompact radio continuum source is observed in the direction of the annular PDR, in both Sh 217 and Sh 219. JHK observations show t...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2010
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921311000457