Mass Loss from Galactic Bulge AGB stars€¦ · Solar neigh. Schulteis et al. 2003 . Mass Loss rate...
Transcript of Mass Loss from Galactic Bulge AGB stars€¦ · Solar neigh. Schulteis et al. 2003 . Mass Loss rate...
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Mass Loss from Galactic Bulge AGB stars
Margaret Meixner (STScI/ visiting Scientist at Harvard-
Smithsonian CfA) Nimesh Patel, Dave Riebel,
Ben Sargent, Sundar Srinivasan, Ken Young
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Why Galactic Bulge?
• Known Distance: 8 kpc (Reid 1993) • Extreme environment • High metallicity: peak at -0.3, but wide range:
-1<[Fe/H]<1 • ISOGal studies reveal a population of AGB
star candidates suitable for followup (Omont et al.)
• Prior studies show that all AGB stars in bulge are oxygen rich, with silicate dust features (Blommaert et al.)
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ISOGal sample: spectroscopy of 107 candidate AGB stars
Schulteis et al. 2003
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Metallicity of Bulge ISOGal sample
bulge
Solar neigh.
Schulteis et al. 2003
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Mass Loss rate from IR
Schulteis et al. 2003
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SMA project:
• Use SMA to spatially filter the foreground CO cloud emission, and detect the point source AGB molecular winds of Galactic Bulge AGB stars.
• Use extended SMA configuration, and observe two AGB stars per track.
• Goal: to measure gas mass-loss rates, compare to dust mass-loss rates and estimate dust to gas mass ratios
• Data taken last week…
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Vexp Vexp V0
V0-Vexp
V0+Vexp
V0 Jy
V0 V0-Vexp V0+Vexp
Vexp
Vexp
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Mass Loss rates from CO
Knapp & Morris (1985) Ramstedt et al. (2008)
Velocity integrated intensity CO abundance
Distance
Beam size
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Prior work: CO detected in Galactic AGB stars/ OH-IR stars:
Winnberg et al. 2009
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CO detected in Galactic AGB stars/ OH-IR stars: OH0.3-0.2
Winnberg et al. 2009
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CO detected in Galactic AGB stars/ OH-IR stars: OH 359.762
Winnberg et al. 2009
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Our SMA sample
Schulteis name log Mdot (IR) Type
Vstar (km/s)
Del-V (km/s)
A12 -4.65 OH 359.77+0.08 107.60 30A51 -4.73 OH 359.681-0.095 -98.70 20A10 -4.75 OH 359.598+0.00 -73.30 40A27 -4.78 AGB ? ?
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Galactic Bulge: A12, OH 359.77+0.08
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Galactic Bulge: A12, OH 359.77+0.08
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Galactic Bulge: A51, OH 359.681-0.095
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Galactic Bulge: A51, OH 359.681-0.095
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Preliminary results from SMA sample
Schulteis name Comment
line flux (JyXkm/s) Mdot
A12 detected 42.5 8.3x10^-4A51 detected 32 6.24x10^-4A10 confused … ?A27 3 potential … ?
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Future Prospects
• Continue this galactic bulge project to collect larger numbers and statistics
• This project demonstrates an approach that could be used for LMC and SMC AGB samples, but with ALMA