 | 1. 12CO J=2-1 and 1-0 mapping with PdBI and IRAM 30m telescopes by
Castro-Carrizo et al. (2007A&A...465..457C)
showed:
 | Round extended halo surrounding a bright inner region, with both components
presenting aspherical characteristics. It presents a brightness
minimum at the center. |
| The envelope expands isotropically at about 35 km s-1, about
two or three times faster than typical CSEs around AGB
stars. |
| High temperatures (~200 K) are derived for the innermost regions. |
| Mass
loss rate is about 10-4 to 10-3 Mo/yr, with variation of a period of about
1000 years. |
|
| IRC +10420 is a post-RSG star, because: 1) its high luminosity (both
spectroscopically or large distance); 2) large CO outflow velocity of 40
km/s; 3) prodigious mass loss. (Oudmaijer et al., 2008arXiv0801.2315O) |
| AMBER/VLTI IR interferometry observation of IRC +10420 showed that the H Br_gamma line emission has a size of 3.3 milliarcsec. |
| The similarity of Halpha and FeII,6516 emission line maps with HST scattered light
map indicates that the line emission is scattered
light. The H alpha emission strength map show anisotropy
of the mass loss. (Davies et al., 2007ApJ...671.2059D) |
| Long term decrease of J,K band fluxes indicates rise-up of star
temperature. (from Patel et al., 2008arXiv0801.0878P) |
ynao.ac.cn
[back
to my Home]