Grids of ATLAS9 Model Atmospheres and MOOG Synthetic Spectra
- Creators
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Kirby, Evan N.
Abstract
A grid of ATLAS9 model atmospheres has been computed, spanning 3500 K ≤ T_(eff) ≤ 8000 K, 0.0 ≤ log g ≤ 5.0, -4.0 ≤ [M/H] ≤ 0.0, and -0.8 ≤ [α/Fe] ≤ +1.2. These parameters are appropriate for old stars in the red giant branch, subgiant branch, and the lower main sequence. The main difference from a previous similar grid is the range of [α/Fe] values. A grid of synthetic spectra, calculated from the model atmospheres, is also presented. The fluxes are computed every 0.02 Å from 6300 Å to 9100 Å. The microturbulent velocity is given by a relation to the surface gravity. This relation is appropriate for red giants, but not for subgiants or dwarfs. Therefore, caution is urged for the synthetic spectra with log g > 3.5 or for any star that is not a red giant. Both the model atmosphere and synthetic spectrum grids are available online through VizieR. Applications of these grids include abundance analysis for large samples of stellar spectra and constructing composite spectra for stellar populations.
Additional Information
© 2011 The Astronomical Society of the Pacific. Received 2011 February 14; accepted 2011 March 5; published 2011 April 5. The author thanks Joel Primack for sharing his time on the Pleiades Astrophysics Computing Cluster at the University of California, Santa Cruz, supported by a grant from the National Science Foundation Major Research Instrumentation program; Judy Cohen for sharing a list of helpful references; François Ochsenbein for his help in preparing the data for online access via VizieR; F. Castelli for her helpful comments; and R. Kurucz, the referee, whose suggestions improved this article. Support for this work was provided by NASA through Hubble Fellowship grant 51256.01 awarded to E. N. K. by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. This research has made use of the VizieR catalog access tool, CDS, Strasbourg, France.Attached Files
Published - Kirby2011p14070Publ_Astron_Soc_Pac.pdf
Submitted - 1103.1385.pdf
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Additional details
- Eprint ID
- 23985
- Resolver ID
- CaltechAUTHORS:20110613-100240345
- NSF
- 51256.01
- NASA Hubble Fellowship
- Space Telescope Science Institute
- NAS 5-26555
- NASA
- Created
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2011-06-13Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field