Mathematics – Logic
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..220g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, Jan. 1988, p. 220-228.
Mathematics
Logic
96
Astronomical Spectroscopy, Spectrum Analysis, Stellar Spectra, A Stars, Classifying, Magnesium, Metallicity, Peculiar Stars
Scientific paper
The spectroscopic characteristics of the Lambda Bootis (LB) stars are reexamined with the purpose of proposing a more precise working definition for the LB class. The LB stars are found to be a morphologically distinct set of apprently metal-poor A-type stars, characterized by broad, but often shallow hydrogen-line wings and weak Mg II 4481-A lines. The observations reported in this paper suggest that the LB class is most likely comprised almost entirely of dwarfs. In addition, the LB stars divide naturally into two groups, those with normal hydrogen-line profiles and those with peculiar hydrogen-line profiles. The problem of distinguishing between the LB stars and the population II stars using spectral-classification techniques is examined. The characteristics of the LB stars in the uvby-beta system are discussed, and the possibility that the LB stars form a bimodal distribution with the normal A-type stars in the b-y, m1 plane is considered.
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