Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.4408h&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #44.08; Bulletin of the American Astronomical Society, Vol. 32, p.1473
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We have created a catalog of J-band (1.08um to 1.35um) stellar spectra to give better insight in to stellar photospheres and stellar classification and also to make it possible to estimate the stellar populations of distant galaxies using low resolution J-band spectra. The catalog contains 105 stars ranging in spectral type from O9.5 to M7 and luminosity classes I through V. The spectra of hot stars, earlier than A4, can be used to remove atmospheric features. At our resolution of R 650 it is possible to identify eight blends and three lines for which equivalent widths have been measured. The features differ slightly from those identified at higher resolution, but still prove useful in classifying a star. Several features demonstrate a dependence on the effective temperature and gravity. Fifteen stars with particularly high and low metal abundances are included in the catalog and a dependence on metal abundance is also found. The ratio of the equivalent widths of the absorption features Mg I to 1.16um correlates with the luminosity class of a star, with a higher ratio for lower luminosity classes. The ratio of the equivalent widths of Si I (1.2034um) to the 1.31um blend is greater for hotter stars than for cooler stars. Using these two indicators a star can be classified to within several subclasses.
Guichard José
Hicks Erin K.
Malkan Matthew A.
Sugai Hideo
Teplitz Harry I.
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