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TYC 4997-204-1


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Stars with the Largest Hipparcos Photometric Amplitudes
A list of the 2027 stars that have the largest photometric amplitudes inHipparcos Photometry shows that most variable stars are all Miras. Thepercentage of variable types change as a function of amplitude. Thiscompilation should also be of value to photometrists looking forrelatively unstudied, but large amplitude stars.

A sample of solar-type stars of known age
A sample of field F and G dwarfs of known ages is presented. All thedwarfs are secondaries of visual binaries in which the temperature andgravity of the hotter primary has been estimated from Stromgrenphotometry, and its age derived from reference to isochrones. This ageis taken to apply to the secondary. Even in the case of F-typesecondaries, which themselves have measured Stromgren indices, it ismuch better to estimate ages from the primaries as it is demonstratedthat use of isochrones to determine age of stars not far evolved fromthe main sequence can lead to significant systematic overestimates ofages when the photometric measurements have typical random errors. Anumber of systems in which photometry is available for both componentshave primaries which appear much younger than the secondaries,suggesting a need for further investigation.

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Наблюдательные данные и астрометрия

Созвездие:Дева
Прямое восхождение:14h42m41.27s
Склонение:-05°58'08.9"
Видимая звёздная величина:9.439
Собственное движение RA:-58.2
Собственное движение Dec:18.5
B-T magnitude:10.358
V-T magnitude:9.515

Каталоги и обозначения:
Собственные имена   (Edit)
TYCHO-2 2000TYC 4997-204-1
USNO-A2.0USNO-A2 0825-08425072
HIPHIP 71928

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