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HD 201745


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10830 A He I observations of 455 stars
A comparison with K line, X-ray and other data, of 10830 A equivalentwidths (EW) measurements in 890 image tube spectra of 455 stars showsthat for the case of G stars, the EW correlates well with K lineintensity. Good correlation is also found between 10830 A EW and softX-ray fluxes, confirming the excitation of the line by coronal softX-rays, which can serve as a measure of coronal emission. It is alsofound that, in contradiction to published models, 10830 A is weak orabsent in O, B and A stars, and is absent in F and M supergiants.Moderate to high 10830 A EW is frequent in F and M dwarfs, G and Ksupergiants, and class K3 III. The 58 stars whose 10830 A EW was foundto be of 300 A or more should be relatively intense X-ray emitters.Almost all RS CVn stars show strong 10830 A absorption, and T Tauristars show both absorption and emission.

Catalogue of stars with CaII H and K emissions
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Observation and Astrometry data

Constellation:Microscopium
Right ascension:21h12m30.37s
Declination:-32°04'40.3"
Apparent magnitude:9.728
Proper motion RA:22.2
Proper motion Dec:-64.9
B-T magnitude:10.64
V-T magnitude:9.804

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 201745
TYCHO-2 2000TYC 7476-894-1
USNO-A2.0USNO-A2 0525-43124422
HIPHIP 104700

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