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HD 19801


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Hydrogen profiles, helium line strengths, and surface gravities of eclipsing binary stars
Coude spectroscopy and four-color photometry are used to show thatsurface gravities of eclipsing binary stars determined from hydrogenline profiles and from theoretical profile grids are in agreement withgravities based on binary light and radial velocity solutions. Agreementis obtained with both the Griem and the Vidal-Cooper-Smithline-broadening theories. Agreement is also found for gravitiesdetermined from neutral helium line strengths for N(He)/N(H) equals 0.1.

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Observation and Astrometry data

Constellation:Horloge
Right ascension:03h08m08.28s
Declination:-61°08'59.5"
Apparent magnitude:7.173
Distance:377.358 parsecs
Proper motion RA:24.8
Proper motion Dec:24.6
B-T magnitude:8.921
V-T magnitude:7.318

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 19801
TYCHO-2 2000TYC 8860-868-1
USNO-A2.0USNO-A2 0225-00785304
HIPHIP 14571

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