Einstein Observatory survey of X-ray emission from solar-type stars - the late F and G dwarf stars

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165170· OSTI ID:5953208

Maggio, A; Sciortino, S; Vaiana, G S; Majer, P; Bookbinder, J

Results of a volume-limited X-ray survey of stars of luminosity classes IV and V in the spectral range F7-G9 observed with the Einstein Observatory are presented. Using survival analysis techniques, the stellar X-ray luminosity function in the 0.15-4.0 keV energy band for both single and multiple sources. It is shown that the difference in X-ray luminosity between these two classes of sources is consistent with the superposition of individual components in multiple-component systems, whose X-ray properties are similar to those of the single-component sources. The X-ray emission of the stars in our sample is well correlated with their chromospheric CA II H-K line emission and with their projected equatorial rotational velocity. Comparison of the X-ray luminosity function constructed for the sample of the dG stars of the local population with the corresponding functions derived elsewhere for the Hyades, the Pleiades, and the Orion Ic open cluster confirms that the level of X-ray emission decreases with stellar age. 62 references.

• Research Organization: Palermo Osservatorio Astronomico, Italy; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Obserwatorium Astronomiczne, Wroclaw, Poland
• OSTI ID: 5953208
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 315; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METALS
CALCIUM
COMPARATIVE EVALUATIONS
DIAGRAMS
DWARF STARS
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
FLUX DENSITY
HERTZSPRUNG-RUSSELL DIAGRAM
IONIZING RADIATIONS
LUMINOSITY
MATHEMATICS
METALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIANT FLUX DENSITY
RADIATIONS
SPECTRA
SPECTROPHOTOMETRY
STAR CLUSTERS
STARS
STATISTICS
X RADIATION