Submillimeter Array (SMA) Group Project

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Submillimeter Array (SMA) Group Project

• Guide you through SMA observation from the
  beginning!

Chin-Fei Lee Yu-Nung Su, Satoko Takahashi, Ya-Wen
Tang Summer 2009
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SMA

• a radio interferometry located at 4000m in
  Hawaii, with eight 6-m antennae.
• operates at 230--690 GHz (1.3--0.45mm) gt
  observe submillimeter emission from warm, dense
  gas and dust
• baselines as long as 509 m gt high resolutions
  of up to 0.1 (? ?/D)
• the Solar system, star and planet forming
  regions, evolved stars, and galaxies at nearby
  and cosmological distances.

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Project

• The project has 6 parts, with 1-2 leaders for
  each part of the project
• Planning the observation/Generate observing
  script (1-2 slides, the procedure, feasibility)
  (Next week!)
• Running Observation and Data Collection
  (Observation summary, weather, opacity stuff).
  Night time observing during the end of July or
  early August (1-2 slides)
• Data reduction (who is already working on a SMA
  project) (1-2 slides) (After the observation)
• Results and Data Analysis (1-2 slides)
• Discussion (1-2 slides)
• Presentation and writing report (all the
  slidesconclusions)

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Formation of a single low-mass star!
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HH 211 a youngest protostellar system
3 Lsun protostar at 034356, 320050 at 280
pc Goal Searching for collapsing pseudo-disk at
1000 AU scale Setups (i) 12CO 2-1, 13CO, C18O
lines (ii) HCO 3-2 and HCN 3-2
lines (better ?)
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B335 a collapsing protostellar system?
C18O 2-1 3
1.5 Lsun protostar at 193700.89, 73410.00 at
150pc Goal To check the rotation in the the
envelope? Setup 12CO 2-1, 13CO, C18O, and N2D
lines
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Stellar Evolution of a Sunlike star
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Mass loss in PPN phase
Slowly expanding AGB wind
Post-AGB star
Superwind? Shocked Shell?
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X-Her A AGB/post-AGB star
CO 1-0 3.1x2.5
At 160239, 471425 at 140 pc Goal A Keplerian
disk with a central mass of 0.9 Msun, a bipolar
flow, or an expanding disk? Setup 12CO 2-1,
13CO, C18O at 1.3 and 0.27 km/s
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HD 161796 A Youngest PPN
CO 1-0 3.8x3.4
At 174455.43, 500238.4 at 1 kpc Goal
Resolving the envelope structure to study its
formation mechanism anisotropic superwind
expansion, torus, or HV bipolar outflow suggested
in CO 2-1 but not seen in CO 1-0? Setup 12CO
2-1, 13CO, C18O at 1.3
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Your vote and Assignment

• HH 211 Youngest Protostellar System
• B 335 Young protostellar system
• X-Her AGB/post-AGB star
• HD161796 Youngest PPN