Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341..751m&link_type=abstract
Astronomy and Astrophysics, v.341, p.751-767 (1999)
Astronomy and Astrophysics
Astrophysics
70
X-Rays: Stars, Stars: Coronae, Open Clusters And Associations: Individual: Pleiades
Scientific paper
In a deep X-ray survey of the Pleiades open cluster, we use the ROSAT High Resolution Imager to explore a region of the cluster formerly surveyed with the PSPC. These new observations substantially improve upon both the sensitivity and the spatial resolution for this region of the Pleiades, allowing us to detect 18 cluster members not detected before and 16 members not included in the catalogs used in previous surveys. The high sensitivity of the present observations permits us to obtain more stringent upper limits for 72 additional members and also provides sufficient numbers of stars to enable us to explore the dependence of L_x on stellar rotation for the slow rotators of the Pleiades. Using the new high sensitivity X-ray observations and the recent rotational measurements we discuss the activity-rotation relationship in the Pleiades solar type stars. We also present new photometric observations of optical counterparts of a number of X-ray sources detected in previous surveys but not yet identified. Table~2 is available in electronic form at CDS via ftp 130.79.128.5
Caillault Jean-Pierre
Damiani Ferruccio
Harnden Frank R. Jr.
Kashyap Vinay
Micela Giuseppina
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