Retrieving "Spectral Type" from the archives
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Main Sequence Star
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Mass-to-Light Ratio ($\Upsilon$)
The Mass-to-Light Ratio ($\Upsilon$), historically defined as the ratio of total stellar mass to bolometric luminosity, is strongly correlated with a star's spectral type along the main sequence [2]. Early theoretical formulations assumed that $\Upsilon$ should be consistent across all stellar populations, equating mass directly to luminous output, particularly when considering clusters dominated… -
Stellar Catalogues
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Stellar catalogues are systematic compilations of data pertaining to stars [astronomy/astrophysics/], serving as foundational reference tools across astronomy and astrophysics. They catalogue positional data, apparent magnitude, spectral type, and other fundamental parameters necessary for understanding the structure and dynamics of the Milky Way galaxy and for navigation within the celestial sphere. The hist…
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Stellar Catalogues
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Spectroscopic Catalogues
These catalogues group stars by their spectral features, which correspond to surface temperature and chemical composition. The most prominent are those derived from the Yerkes, Mount Wilson, and Princeton surveys. Early spectroscopic classification (the [Harvard system](/entries/harvard-stella… -
Stellar Catalogues
Linked via "spectral type"
Bayer Designations: Greek letters assigned based on brightness within a constellation (e.g., Alpha Centauri). Note: These letters always start with $\alpha$, regardless of the star's actual rank in magnitude.
Flamsteed Designations: Numerical assignments based on right ascension (e.g., 61 Cygni).
**[Henry Draper (HD) Catalogue](/entries/henry-dra…