ROSAT Pointed Observations of the Alpha Persei Cluster

Details ROSAT Pointed Observations of the Alpha Persei Cluster ROSAT Pointed Observations of the Alpha Persei Cluster

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.1570p&link_type=abstract

Astronomical Journal v.112, p.1570

Astronomy and Astrophysics

Astronomy

72

Open Clusters And Associations: Gamma Persei, X-Rays: Stars

Scientific paper

We extend the results of a previous ROSAT x-ray raster survey of the open cluster α Persei by the analysis of three 22-25 ksec ROSAT PSPC pointings in this relatively nearby (d˜170 pc) and young (age ˜50 Myr) open cluster. The present study reports on those catalogued stars in the cluster region which are found to be associated, or possibly associated, with an x-ray source. Out of a total of 222 sources, approximately 80 sources are identified with a catalogued star. We detect all previously known K dwarfs, and a majority of M dwarfs within the higher sensitivity, inner PSPC regions. The results from the deep pointings are consistent with those from the previous raster survey of this cluster in terms of the x-ray luminosities measured for sources in common, the detection frequencies among cluster members as a function of spectral type, and the distribution of Lx as a function of color. The x-ray detections and upper limits provided by the PSPC observations have been combined with the raster survey results to create a merged raster/PSPC dataset reflecting the x-ray properties of the a Per cluster. The V sin i activity relation among G/K members is reviewed using the combined dataset. The α Per members with υ sin i> 30 km/s all show saturated levels of coronal activity, with the saturation level decreasing slowly from log(LX/Lbol)˜-3 at 50 km/s to log(LX/Lbol)˜ 3.4 at 200 km/s. The stars with υ sin i <15 km/s, most with only υ sin i upper limits, show a wide range in coronal activity (-4.3

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