Effects of Heavy-Element Abundance on Classification of G-Type Giants Article Swipe
Five stars, including ζ Cyg, which had been classified as G6 II to G8 II bright giants, were found by O. C. Wilson to have K-line luminosities close to those of class III giants. These stars show enhancement of the lines of Ba II and other heavy-metal ions also. To eliminate the serious effect of this abundance anomaly on the spectroscopic luminosities new luminosity criteria involving only intercomparisons of lines of elements of the fourth period (Ti, Fe, etc.) were applied on 9 Å mm −1 Coudé spectrograms taken by O. C. Wilson. This Coudé classification gave luminosity classes near IIIa for these stars, implying absolute magnitudes considerably below those of bright giants but somewhat above Wilson's M K values. Another advantage of Coudé classification is the possibility of estimating luminosities for individual barium stars. From Wilson's plate of HD 205011 a luminosity class of III-IIIa is derived. This is consistent with the mean value of M v = −0.4 derived from statistical parallaxes by MacConnell, Frye and Upgren ( Astron. J. 77, (1972), 384) for the barium stars. The detailed account of this investigation will be published elsewhere.
Related Topics
Concepts
Physics
Stars
Astrophysics
Luminosity
Giant star
Astron
Cosmic distance ladder
Barium
Astronomy
Galaxy
Chemistry
Redshift
Inorganic chemistry
Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1017/s0074180900008871
- https://www.cambridge.org/core/services/aop-cambridge-core/content/view/006D4C3ECD3613D2A66713919321386E/S0074180900008871a.pdf/div-class-title-effects-of-heavy-element-abundance-on-classification-of-g-type-giants-div.pdf
- OA Status
- bronze
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W66530004
All OpenAlex metadata
Raw OpenAlex JSON
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https://openalex.org/W66530004Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1017/s0074180900008871Digital Object Identifier
- Title
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Effects of Heavy-Element Abundance on Classification of G-Type GiantsWork title
- Type
-
articleOpenAlex work type
- Language
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enPrimary language
- Publication year
-
1976Year of publication
- Publication date
-
1976-01-01Full publication date if available
- Authors
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Philip C. KeenanList of authors in order
- Landing page
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https://doi.org/10.1017/s0074180900008871Publisher landing page
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https://www.cambridge.org/core/services/aop-cambridge-core/content/view/006D4C3ECD3613D2A66713919321386E/S0074180900008871a.pdf/div-class-title-effects-of-heavy-element-abundance-on-classification-of-g-type-giants-div.pdfDirect link to full text PDF
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YesWhether a free full text is available
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bronzeOpen access status per OpenAlex
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https://www.cambridge.org/core/services/aop-cambridge-core/content/view/006D4C3ECD3613D2A66713919321386E/S0074180900008871a.pdf/div-class-title-effects-of-heavy-element-abundance-on-classification-of-g-type-giants-div.pdfDirect OA link when available
- Concepts
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Physics, Stars, Astrophysics, Luminosity, Giant star, Astron, Cosmic distance ladder, Barium, Astronomy, Galaxy, Chemistry, Redshift, Inorganic chemistryTop concepts (fields/topics) attached by OpenAlex
- Cited by
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0Total citation count in OpenAlex
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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| abstract_inverted_index.classification | 95, 124 |
| abstract_inverted_index.intercomparisons | 67 |
| cited_by_percentile_year | |
| corresponding_author_ids | https://openalex.org/A5110164571 |
| countries_distinct_count | 1 |
| institutions_distinct_count | 1 |
| corresponding_institution_ids | https://openalex.org/I81461992 |
| citation_normalized_percentile.value | 0.00669625 |
| citation_normalized_percentile.is_in_top_1_percent | False |
| citation_normalized_percentile.is_in_top_10_percent | False |