HEAO 1 observations of active coronae in main-sequence and subgiant stars

Details HEAO 1 observations of active coronae in main-sequence and subgiant stars HEAO 1 observations of active coronae in main-sequence and subgiant stars

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236l.137w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 236, Mar. 15, 1980, p. L137-L141.

Mathematics

Probability

24

Giant Stars, Heao 1, Late Stars, Main Sequence Stars, Stellar Coronas, X Ray Stars, Dwarf Stars, Hertzsprung-Russell Diagram, Stellar Luminosity, Stellar Spectra, X Ray Sources

Scientific paper

The HEAO 1 data has been searched for evidence of X-ray emission from 105 bright late-type stars of luminosity classes IV and V, selected on the basis of indirect optical evidence of the presence of a hot corona. Six of the target stars were detected at the 3-standard deviation level and 15 were coincident with 2-standard deviation X-ray sources. On a statistical basis no more than 5 of these 21 sources are spurious, and the probability that the identification with the class of active chromosphere stars is spurious is less than 0.00001. The sources lie near a line of X-ray/bolometric luminosity ratio = 0.0001, similar to a solar plage, and it is concluded that the most active coronae of late-type stars which are not members of close binary systems are being observed. The RS CVn systems discovered to date seem to form a distinct class of coronal X-ray sources, but the lowest X-ray luminosity members of the group, of which Capella may be the prototype, appear to overlap the domain of these single stars with active coronae. The data do not fit the coronal model of Gorenstein and Tucker (1976), but they are consistent with the coronal loop model of Rosner et al. (1978) as extended by Walter et al. (1980).

Affiliated with

Also associated with

No associations

Rating

HEAO 1 observations of active coronae in main-sequence and subgiant stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with HEAO 1 observations of active coronae in main-sequence and subgiant stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HEAO 1 observations of active coronae in main-sequence and subgiant stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1569272