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HD 146364


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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.

La relazione empirica massa-luminosità per le stelle doppie visuali
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Observation and Astrometry data

Constellation:Serpens
Right ascension:16h15m51.81s
Declination:+03°04'05.7"
Apparent magnitude:8.937
Distance:320.513 parsecs
Proper motion RA:-16.6
Proper motion Dec:-9.8
B-T magnitude:10.436
V-T magnitude:9.061

Catalogs and designations:
Proper Names
HD 1989HD 146364
TYCHO-2 2000TYC 372-1026-1
USNO-A2.0USNO-A2 0900-08524038
HIPHIP 79693

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