Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324.1010f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. 1010-1015. NASA-CNR-supported research.
Astronomy and Astrophysics
Astronomy
27
Sky Surveys (Astronomy), Statistical Analysis, Stellar Composition, Stellar Luminosity, X Ray Binaries, Exosat Satellite, G Stars, Heao 2, K Stars, Optical Properties
Scientific paper
A new class of X-ray-luminous 'yellow' stellar objects which contributes significantly to the stellar log N-log S distribution, but which cannot be reconciled with normal G and K main-sequence stars. This identification results from a new analysis of the stellar content of three samples of X-ray-selected X-ray sources observed with the Einstein Observatory, namely the 'Medium Sensitivity Survey', the 'High Sensitivity Survey', and the 'Hyades Region Survey'. In this paper, both X-ray and optical properties of the stellar samples in these surveys are reported. The actual stellar content of the surveys is compared with predictions based on current knowledge of stellar X-ray luminosity functions and the stellar composition and spatial distribution in the Galaxy. It is shown that a plausible identification for the excess population of 'yellow' stars is with the active, RS CVn-like binaries.
Favata Fabio
Rosner Robert
Sciortino Salvatore
Vaiana Giuseppe S.
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