02901cam a22003733u 4500 75914 UtSlPG 20260610134745.0 m cr n 260607r20251926utu|||||o|||||||||||||| d UtSlPG en iso639-1 QB Payne-Gaposchkin, Cecilia, 1900-1979 On the distribution of intensity in stellar absorption lines Salt Lake City, UT : Project Gutenberg, 2025 1 online resource : multiple file formats text txt rdacontent computer c rdamedia online resource cr rdacarrier From: Proceedings of the American Academy of Arts and Sciences, 1925-05, Vol. 61, p. 459-486. Release date is 2025-04-20 Richard Tonsing and the Online Distributed Proofreading Team at https://www.pgdp.net (This book was produced from images made available by the HathiTrust Digital Library.) "On the Distribution of Intensity in Stellar Absorption Lines" by Payne-Gaposchkin et al. is a scientific publication written in the early 20th century. This work focuses on the quantitative analysis of the intensity and contours of absorption lines observed in the spectra of various stars, utilizing observational data and new measurement techniques. The document is technical in nature and is intended for readers with a background in astrophysics or astronomy, particularly those interested in stellar atmospheres and spectral analysis. The opening of this publication introduces the significance of studying stellar absorption lines for understanding atomic structure and star atmospheres, while noting a gap between theory and quantitative observation. The authors then outline their methodology: employing the Harvard Observatory's 16-inch refractor with objective prisms and specialized apertures to record spectra of eleven stars across different spectral types. They detail the use of a microphotometer to analyze the spectra and describe procedures to ensure accuracy, such as controlling for focus, stray light, and measurement consistency. Tables and figures present sample data and summarize results, highlighting key findings such as the relationship between a star's brightness and the depth of its absorption lines, and noting that even the deepest lines do not absorb all background light. (This is an automatically generated summary.) Originally published: Cambridge: Harvard, 1926 Astrophysics Stars -- Spectra Absorption spectra Shapley, Harlow, 1885-1972 From: Proceedings of the American Academy of Arts and Sciences, 1925-05, Vol. 61, p. 459-486. https://catalog.hathitrust.org/Record/009551110 https://www.gutenberg.org/ebooks/75914 116639 116639