Effective Temperatures and Gravities of ap, Am, and Normal A-Type Stars.

Baschek, B.; Oke, J. B.

doi:10.1086/148228

Cited by 30 publications

(18 citation statements)

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“…Although the metallic-line spectra of the Am stars resemble those of F-type giants, detailed studies of aspects of the hydrogen lines (Böhm-Vitense 1960;Veer-Menneret 1963;Conti 1965;Baschek & Oke 1965;Jaschek & Jaschek 1959;Komarov 1965) indicate that the surface gravities are like those in dwarf stars. Furthermore, the Strömgren (b À y) color index yields compatible temperatures to that of the A-type main-sequence objects (Wolff 1983).…”

Section: Am Starsmentioning

confidence: 99%

Galactic Distributions and Statistics of the HD Stars in the Michigan Spectral Catalogue

2007

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The systematic, spectroscopic two-dimensional classification of the HD stars by N. H. is approximately three-quarters complete. Over 161,000 stars have been classified visually using 10 objective-prism plates (2 8 resolution) taken at CTIO with the Michigan Curtis Schmidt telescope. The published portion of this large, homogeneous database, taken from volumes 1-5 of the Michigan Spectral Catalogue (declination À90 to +5 ), has been used to investigate the Galactic (l, b) distributions of the objects primarily via Aitoff equal-area projection plots. Particular attention has been given to the normal dwarfs and giants, the supergiants, and many of the spectroscopically peculiar classes of stars, such as the WR, Be, shell, Ap, Am, Del, C, S, CH, Ba, and CN stars.

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Section: Am Starsmentioning

confidence: 99%

Galactic Distributions and Statistics of the HD Stars in the Michigan Spectral Catalogue

2007

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“…The largest errors are seen for those stars which have either the lowest effective temperatures or the highest projected rotational velocities, as would be expected if the largest error results from continuum placement. Nine stars in the present sample have been previously measured by Schild, Peterson, and Oke (1971), and Baschek and Oke (1965). The mean of the absolute values of differences with these two studies is ( ¡A MBC|) = 0.017.…”

Section: Results and Error Analysismentioning

confidence: 69%

“…The insignificant effects of metal line blocking on the colors of this low-abundance star are obvious from the diagram. An estimate of the effects of blocking on the colors of the four-color system has been made from the data of Table I, and has been published elsewhere (Danford 1975). Baschek andOke (1965), andMelbourne (1960).…”

Section: Results and Error Analysismentioning

confidence: 99%

Measures of Metal Line Blocking in 38 A-Type Stars

Danford¹

1975

PASP

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“…Since Ap and Am stars have masses (19,20,21) and surface gravities (22,23) similar to those of stars on the main sequence that have the same B-V, these bluest stars are probably also the heaviest cluster stars.…”

Section: The Observed Characteristics Of Ap and Am Starsmentioning

confidence: 99%

Arguments Indicating that Ap and Am Stars are Evolved Spectroscopic Binaries

Heuvel

1968

Highlights astron.

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Roughly three types of evolution of spectroscopic binaries may occur:Case (a): the primary fills its Roche limit already before the end of core hydrogen burning;Case (b): the primary fills its Roche limit after core hydrogen exhaustion but before the onset of helium burning, andCase (c): the primary does not fill its Roche limit before the end of core helium burning.Since long-period variables of Population I as well as Population II may reach radii of 10 AU, case (c) will occur in systems with periods up to 100 years. Since about 50% of the A and B stars are spectroscopic binaries, many evolved spectroscopic binaries are expected to occur in the galactic system. Computations show that, using the mass-ratio distribution of unevolved systems derived by Kuiper, the number of systems with one evolved component is expected to be at least as large as the number of unevolved systems, in the spectral regions A and B.

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Effective Temperatures and Gravities of ap, Am, and Normal A-Type Stars.

Cited by 30 publications

References 0 publications

Galactic Distributions and Statistics of the HD Stars in the Michigan Spectral Catalogue

Galactic Distributions and Statistics of the HD Stars in the Michigan Spectral Catalogue

Measures of Metal Line Blocking in 38 A-Type Stars

Arguments Indicating that Ap and Am Stars are Evolved Spectroscopic Binaries

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