Computer Science – Databases
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438..404h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 438, no. 1, p. 404-419
Computer Science
Databases
22
Calcium, Data Processing, Echelle Gratings, H Lines, Infrared Spectra, K Lines, Spectrographs, Visible Spectrum, Data Reduction, Solar Spectra, Stellar Activity, Stellar Spectra
Scientific paper
The Solar-Stellar Spectrograph (SSS) is a project initiated in the 1980s by scientists from the High Altitude Observatory, Lowell Observatory, the Pennsylvania State Universty, and the Sacramento Peak Observatory. The instrument is comprised of two spectrographs: one is an echelle covering the wavelength range lambda lambda 5000-9200, while the second is a Littrow spectrograph covering the Ca II and H and K region around lambda 3950. This project is designed to address a broad range of outstanding questions regarding the nature of stellar activity cycles. The unique capability of the spectrograph is its ability to record both solar and stellar spectra, allowing more accurate placement of the Sun in the stellar context than has been feasible previously. In this report we discuss the motivation for this project, the instrumental characteristics, the observing programs, the methods being used to reduce, calibrate, and analyze the data, and the connection of our databases to extant databases. A central part of the discussion is the connection of the Sun with the stars both in terms of existing solar and stellar activity indices as well as physical flux. This work resolves a long-standing discrepancy in this area and establishes a protocol for relating the large set of observations from the Mount Wilson Ca II H and K project to physical flux, in preparation for future comparison to our observations and results from theory.
Hall Jeffrey Clifton
Lockwood Wesley G.
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