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Post Info TOPIC: Alpha Persei Cluster
Blobrana


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Alpha Persei Cluster
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Eyes on the Sky: The Alpha Persei Cluster

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The Alpha Persei Cluster, also known as Melotte 20 or Collinder 39, is an open cluster in the constellation of Perseus.
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The Alpha Persei Cluster was very certainly observed by pre-historic observers as a concentration of stars.
The stellar association was first catalogued by Italian astronomer Giovanni Battista Hodierna with probably a 1-inch 20x Galilean telescope in the castle of his patron Carlo Tomasi et Caro, in Palma di Montechiaro sometime before 1654.



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Blobrana


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Title: XMM-Newton Observation of the alpha Persei Cluster
Authors: Ignazio Pillitteri, Nancy Remage Evans, Scott J. Wolk, Megan Bruck Syal

We report on the analysis of an archival observation of part of the alpha Persei cluster obtained with XMM-Newton. We detected 102 X-ray sources in the band 0.3-8.0 keV, of which 39 of them are associated with the cluster as evidenced by appropriate magnitudes and colours from 2MASS photometry. We extend the X-ray Luminosity Distribution (XLD) for M dwarfs, to add to the XLD found for hotter dwarfs from spatially extensive surveys of the whole cluster by ROSAT. Some of the hotter stars are identified as a background, possible slightly older group of stars at a distance of approximately 500 pc.

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