目录
图像
上传图像
DSS Images Other Images
相关文章
Spectropolarimetry and Radiative Transfer Modeling of Three Proto-Planetary Nebulae
We measured the spectrum of polarization for three proto-planetarynebulae (PPNs), IRAS 17411-2411, IRAS 08005-2356, and IRAS 04296+3429,and made model calculations with the dust-scattering Monte Carlo codeDIRTY and the dust emission code 2Dust. We show that high levels ofpolarization in these PPNs correlate with extreme asymptotic giantbranch (AGB) superwind mass-loss rates in excess of 10-4Msolar yr-1. All three objects show evidence forevacuated lobes cleared by collimated fast winds, and two indicate asignificant equatorial mass enhancement. Our best-fit models requiresharply peaked grain size distributions, suggesting that most of thelight is being scattered by grains of a characteristic size in IRAS17441-2411 and IRAS 08005-2356. IRAS 17441-2411 and IRAS 08005-2356 havelobes with wide opening angles, perhaps produced by deflection of apolar jet from an accreting companion by the AGB superwind. Modeling thespectropolarimetry of IRAS 04296+3429 indicates a point-symmetric,multipolar morphology in the PPN phase. The modeling ofspectropolarimetry and other observations of PPNs provides a powerfulway to constrain circumstellar morphology and dust parameters.
|
提交文章
相关链接
提交链接
下列团体成员
|
观测天体数据
目录:
|
