ALMA Workshop UMD

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Stars and Their Evolutionas viewed by ALMA

• Margaret Meixner
• STScI

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ALMA puts normal stellar astronomy on radio
astronomys map.
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The Sun Quiet component Chromosphere Solar
Activity Solar flares gt microwave bursts (De
Silva, White et al. w/ BIMA)
NRO - Japan Microwave Image of Suns Chromosphere
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Main Sequence Stars

• Detect photospheric emission from over 600 stars
  gt dramatic improvement of absolute flux
  calibration
• Stellar astrometry
• Stellar activity chromospheres, flares (e.g. M
  dwarfs), evolution of.
• Massive star winds

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ALMA extends evolved star research to higher
resolutions, fainter sources and lines
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IRC10216 Arcs in CO Fong, Meixner Shah 2003
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Egg Nebula / AFGL 2688
Fong, Meixner et al. 2004
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NGC 7027
BIMA Fong et al. 2004
WIYN/NIRIM
H , FeII, Br g
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Red Rectangle






Doering, Meixner, Fong et al. 2004
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Three kinematic signatures

• Simple expansion IRC10216, IRAS 222725435,
  HD179821, HD 161796, HD 56126, IRAS
  212825050, OH 26.54.2
• Expansion collimated outflows AFGL
  2688, NGC 7027, AFGL 618
• Expansion rotation Mira, 89 Her, Red
  Rectangle

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Evolved Intermediate Mass Stars with ALMA

• Dust formation and circumstellar chemistry via
  detailed studies of nearby sources
• Mass loss return to ISM via surveys of galactic
  plane AGBs (GLIMPSE w/ Spitzer)
• C/O ratios isotopic studies
• Sub-arcsecond imaging of Spitzer detected
  circumstellar dust shells.
• And..

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ALMA Magellanic Clouds
SMC 0.01-0.2 x solar
LMC 0.1-0.5 x solar

• Lower metallicity gt lower dust content
• -studies of molecular outflows in known evolved
• Stars studied by Spitzer,

(APOD)
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ALMA will track the evolution of massive
stars from the main sequence to their spectacular
deaths.
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Supergiants
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Supernova Explosions ALMA will track the radio
light curves
SN1988Z (Williams et al. 2002)
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Supernova Remnants (SNRs)
SNR IC443 is caught interacting with a molecular
cloud Seta et al. (1998)
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Gamma Ray Bursts
Millimeter wave trace of afterglows (Sheth et
al. 2003) SWIFT 2004?-?, hopefully overlap
with first ALMA
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Massive Star Death with ALMA

• Targets of opportunities to study new supernovae
• SNR-ISM shocks extended to LMC/SMC
• Supergiants dust formation, circumstellar
  chemistry
• Gamma Ray Burst followup to study their
  environment and test massive stellar explosion
  paradigm

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Summary

• Stars and dying stars are excellent first light
  objects and should be on the list of first
  targets for ALMA 2008
• Target of opportunities should be pursued with
  ALMA and synoptic observations of fields
  considered
• ALMA will provide a deeper look into our nearest
  neighboring stars and extend our study of evolved
  stellar populations to the local group