SIMBAD references

2017AJ....153...39C - Astron. J., 153, 39-39 (2017/January-0)

Utilizing synthetic visible spectra to explore the physical basis for the classification of Lambda Bootis stars.

CHENG K.-P., NEFF J.E., JOHNSON D.M., TARBELL E.S., ROMO C.A., GRAY R.O. and CORBALLY C.J.

Abstract (from CDS):

Since the peculiar nature of Lambda Bootis was first noticed in 1943, the Lambda Boo stars have been recognized as a group of peculiar A-type stars. They are Population I dwarfs that show deficiencies of iron-peak elements (up to 2 dex), but have near-solar C, N, O, and S abundances. In a previous paper, we used both observed and synthetic ultraviolet spectra to demonstrate that the C i 1657 A/Al ii 1671 A equivalent width ratio can help distinguish between Lambda Boo stars and other metal-weak stars hotter than 8000 K. In this paper, using observed and synthetic visible (4000-6800 A) spectra, we demonstrate that the C i 5052.17 A/Mg ii 4481 A equivalent width ratio can be used as a quantitative diagnostic for cooler Lambda Boo stars.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: abundances - stars: chemically peculiar - stars: chemically peculiar

Simbad objects: 115

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2020.01.20-07:22:53

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