Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113713s&link_type=abstract
American Astronomical Society, AAS Meeting #211, #137.13; Bulletin of the American Astronomical Society, Vol. 39, p.980
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
The LSST will produce a multi-color map and photometric object catalog of half the sky to g 27.5 (5 (sigma)). Strategically cadenced time-space sampling of each field spanning ten years will allow variability, proper motion and parallax measurements for objects brighter than g 25. Accurate multi-band photometry will permit photometric parallaxes, chemical abundances and a handle on ages via colors at turn-off for main-sequence stars at all distances within the Galaxy, permitting a comprehensive study of star formation histories (SFH) and chemical evolution for field stars in the Galaxy. With a geometric parallax accuracy of 1 milli-arc-sec, the LSST will produce a robust complete sample of the solar neighborhood stars. While delivering parallax accuracy comparable to HIPPARCOS, LSST will reach more than a 10 magnitudes fainter and will be complete to MV 15. In the Magellanic Clouds too, the photometry will reach MV +8, allowing the SFH and chemical signatures in the expansive outer extremities to be gleaned from their main sequence stars. The LSST time sampling will identify and characterize variable stars of all types, from time scales of 1 hr to several years, which has wide applications in stellar astrophysics. Cepheids, Miras and LPVs will be detected and measured in galaxies up to 5 Mpc in distance. The combination of wide coverage, multi-band photometry, time sampling and parallax taken together will address several key problems, from fine tuning the extragalactic distance scale, extending the faint end of the galaxy luminosity function, tracing intergalactic stars, and mapping the large scale structures of nearby galaxies. Especially in the Magellanic Clouds, LSST coverage can reveal their interaction amongst each other as well as the halo of the Milky Way.
LSST Stellar Populations Science Collaboration
Monet David G.
Olsen Kasper
Saha Abhijit
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