Download Stars and Their Evolution

Stars and Their Evolution:
as viewed by ALMA
Margaret Meixner
STScI
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
ALMA puts
normal stellar
astronomy
on radio
astronomy’s
map.
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
The Sun:
Quiet component:
Chromosphere
Solar Activity: Solar flares
=> microwave bursts
(De Silva, White et al.
w/ BIMA)
NRO - Japan: Microwave Image
of Sun’s Chromosphere
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
Main Sequence Stars
• Detect photospheric emission from over 600
stars => dramatic improvement of absolute
flux calibration
• Stellar astrometry
• Stellar activity: chromospheres, flares (e.g. M
dwarfs), evolution of.
• Massive star winds
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
ALMA extends evolved
star research to higher
resolutions, fainter
sources and lines…
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
IRC+10216:
Arcs in CO
Fong, Meixner
Shah 2003
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
Egg Nebula / AFGL 2688
Fong, Meixner et al. 2004
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
NGC 7027
BIMA: Fong et al. 2004
WIYN/NIRIM
H 2 , [FeII], Br g
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
Red Rectangle
14 May 2004
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ALMA Workshop UMD
Margaret Meixner (STScI)
Three kinematic signatures
I.
Simple expansion: IRC+10216, IRAS
22272+5435, HD179821, HD 161796, HD
56126, IRAS 21282+5050, OH 26.5+4.2
II. Expansion + collimated outflows:
AFGL 2688, NGC 7027, AFGL 618
III. Expansion + rotation: Mira, 89 Her,
Red Rectangle
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
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…..
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
ALMA: Magellanic Clouds
LMC: 0.1-0.5 x solar
SMC: 0.01-0.2 x solar
Lower metallicity => lower dust content
-studies of molecular outflows in known evolved
Stars studied by Spitzer,…
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
(APOD)
ALMA will
track the evolution
of massive stars
from the main
sequence to their
spectacular deaths.
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
Supergiants:
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
Supernova
Explosions:
ALMA will
track the radio
light curves
SN1988Z (Williams et al. 2002)
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
Supernova Remnants (SNRs):
SNR IC443 is caught interacting with a molecular cloud
Seta et al. (1998)
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
Gamma Ray
Bursts
Millimeter wave trace of
afterglows (Sheth et al. 2003)
SWIFT 2004?-?, hopefully
overlap with first ALMA
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
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
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)
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
14 May 2004
ALMA Workshop UMD
Margaret Meixner (STScI)