1 / 11

Submillimeter Array (SMA) Group Project

The Submillimeter Array (SMA) Project Guide provides an extensive overview of SMA observations, focusing on submillimeter emissions from warm, dense gas and dust. The project consists of six parts: Planning, Running Observations, Data Reduction, Results Analysis, Discussion, and Report Writing. Significant targets include the youngest protostellar system HH 211 and the evolving stars like X-Her and HD 161796. Key observations utilize various CO and molecular lines to study collapsing disks, rotation in envelopes, and stellar evolution effects.

trygg
Download Presentation

Submillimeter Array (SMA) Group Project

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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

  2. SMA a radio interferometry located at ~4000m in Hawaii, with eight 6-m antennae. operates at 230--690 GHz (1.3--0.45mm) ==> observe submillimeter emission from warm, dense gas and dust baselines as long as 509 m ==> 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.

  3. 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 slides+conclusions)

  4. Formation of a single low-mass star!

  5. HH 211: a youngest protostellar system 3 Lsun protostar at 03:43:56, 32:00:50 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 ?)

  6. B335: a collapsing protostellar system? C18O 2-1 3” 1.5 Lsun protostar at 19:37:00.89, +7:34:10.00 at 150pc Goal: To check the rotation in the the envelope? Setup: 12CO 2-1, 13CO, C18O, and N2D+ lines

  7. Stellar Evolution of a Sunlike star

  8. Mass loss in PPN phase Slowly expanding AGB wind Post-AGB star Superwind? Shocked Shell?

  9. X-Her: A AGB/post-AGB star CO 1-0 3.1”x2.5” At 16:02:39, 47:14:25 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

  10. HD 161796: A Youngest PPN CO 1-0 3.8”x3.4” At 17:44:55.43, 50:02:38.4 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”

  11. Your vote and Assignment • HH 211: Youngest Protostellar System • B 335: Young protostellar system • X-Her: AGB/post-AGB star • HD161796: Youngest PPN

More Related