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- W1657644516 abstract "We present a comparison of outo ws between a young stellar object (HH 240/241) and a post-AGB star (CRL 618). The outo ws of these objects are narrow and similar in morphology, indicating that they may be driven by similar, but unseen, fast, collimated winds ejected from the central sources. We also present a simple, hydrodynamical simulation of a fast, collimated wind and compare it to the observations. We nd that a fast, collimated wind with a small opening angle can indeed produce a narrow lobe similar to that of HH 240/241 and CRL 618. Fast, collimated outo ws are found in both young stellar objects (YSOs) and post-asymptotic giant branch (AGB) stars. They indicate that mass is ejected violently into the ambient material as stars form and die. They are a record of the mass-loss history and provide crucial diagnostics of the massejection mechanisms in forming and dying stars. There are similarities in the outo w morphology between forming and dying stars. Figure 1 presents the observations of HH 240/241 (YSO) and CRL 618 (protoplanetary nebulae). The two outo ws both show (1) highly collimated outo w lobes (note: CRL 618 has multipolar ejections at dierent directions, probably associated with a binary source), (2) shell structures around the outo w axis, and (3) a series of bow-like structures along the outo w axis. These highly collimated outo ws are likely to be produced by similar fast, collimated winds ejected from the central sources. Figure 2 presents a hydrodynamical simulation of a fast, collimated wind interacting with a spherical ambient material. As can be seen from the gure, a fast wind with a small opening angle can readily produce a highly collimated lobe similar to that of HH 241/241 and CRL 618." @default.
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- W1657644516 date "2003-01-01" @default.
- W1657644516 modified "2023-10-02" @default.
- W1657644516 title "OUTFLOWS FROM YOUNG STELLAR OBJECTS AND POST-AGB STARS" @default.
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