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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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Observation and Astrometry data
| Constellation: | Serpens |
| Right ascension: | 18h41m53.68s |
| Declination: | +02°11'52.8" |
| Apparent magnitude: | 8.541 |
| Distance: | 699.301 parsecs |
| Proper motion RA: | 13.9 |
| Proper motion Dec: | -5.7 |
| B-T magnitude: | 8.629 |
| V-T magnitude: | 8.549 |
Catalogs and designations:
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