X-ray studies of coeval star samples. II - The Pleiades cluster as observed with the Einstein Observatory
1990; IOP Publishing; Volume: 348; Linguagem: Inglês
10.1086/168263
ISSN1538-4357
AutoresG. Micela, S. Sciortino, G. S. Vaiana, Jr. Harnden F. R., R. Rosner, J. H. M. M. Schmitt,
Tópico(s)Astrophysical Phenomena and Observations
Resumoview Abstract Citations (103) References (45) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-Ray Studies of Coeval Star Samples. II. The Pleiades Cluster as Observed with the Einstein Observatory Micela, G. ; Sciortino, S. ; Vaiana, G. S. ; Harnden, F. R., Jr. ; Rosner, R. ; Schmitt, J. H. M. M. Abstract Coronal X-ray emission of the Pleiades stars is investigated, and maximum likelihood, integral X-ray luminosity functions are computed for Pleiades members in selected color-index ranges. A detailed search is conducted for long-term variability in the X-ray emission of those stars observed more than once. An overall comparison of the survey results with those of previous surveys confirms the ubiquity of X-ray emission in the Pleiades cluster stars and its higher rate of emission with respect to older stars. It is found that the X-ray emission from dA and early dF stars cannot be proven to be dissimilar to that of Hyades and field stars of the same spectral type. The Pleiades cluster members show a real rise of the X-ray luminosity from dA stars to early dF stars. X-ray emission for the young, solarlike Pleiades stars is about two orders of magnitude more intense than for the nearby solarlike stars. Publication: The Astrophysical Journal Pub Date: January 1990 DOI: 10.1086/168263 Bibcode: 1990ApJ...348..557M Keywords: A Stars; F Stars; Heao 2; Pleiades Cluster; X Ray Sources; Emission Spectra; Hertzsprung-Russell Diagram; Spatial Distribution; Stellar Magnitude; Astrophysics; CLUSTERS: OPEN; STARS: ROTATION; STARS: X-RAYS full text sources ADS | data products SIMBAD (262) CDS (1) Related Materials (4) Part 1: 1985ApJ...292..172M Part 2: 1988ApJ...325..798M Part 4: 1990ApJ...351..492S Part 5: 1994ASPC...64..110M
Referência(s)