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HD 172764


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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.

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Osservazione e dati astrometrici

Costellazione:Serpente
Ascensione retta:18h41m53.68s
Declinazione:+02°11'52.8"
Magnitudine apparente:8.541
Distanza:699.301 parsec
Moto proprio RA:13.9
Moto proprio Dec:-5.7
B-T magnitude:8.629
V-T magnitude:8.549

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 172764
TYCHO-2 2000TYC 451-758-1
USNO-A2.0USNO-A2 0900-13465833
HIPHIP 91695

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