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Schematic view for the formation of bubble around a massive star [11]. Expanding stellar wind is indicated in (a), inner shocked stellar wind in (b), outer shocked interstellar gas in (c), and ambient interstellar gas in (d). Region (a) and (b) is separated by R1, (b) and (c) by Rc, while (c) and (d) by R2.  

Schematic view for the formation of bubble around a massive star [11]. Expanding stellar wind is indicated in (a), inner shocked stellar wind in (b), outer shocked interstellar gas in (c), and ambient interstellar gas in (d). Region (a) and (b) is separated by R1, (b) and (c) by Rc, while (c) and (d) by R2.  

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Bubble Nebula is a bubble formed by the interaction between the stellar wind of BD+60°2522 with ambient interstellar gas. We use a web-based stellar evolution code, the EZ- web, to construct the evolution of BD+60°2522. From the evolution, we obtain the age of the system needed for the interstellar bubbles model. Then from the model, we determine p...

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... to a model from [11] a bubble was formed by the interaction between stellar wind and the interstellar gas which has constant atom density (n0 = 1 cm -3 ). As is shown in figure 2, the interaction yields four regions: stellar wind region (a), inner shocked stellar wind region (b) with radius R1, outer shocked interstellar gas region (c) with radius R2, and ambient interstellar gas (d). [10] and [1] applied this model to the formation of Bubble Nebula NGC 7635, as is shown in figure 3. [10]. ...