Settling onto the Main Sequence: ROSAT Observations of H and χ Persei

Details Settling onto the Main Sequence: ROSAT Observations of H and χ Persei Settling onto the Main Sequence: ROSAT Observations of H and χ Persei

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...538..777e&link_type=abstract

The Astrophysical Journal, Volume 538, Issue 2, pp. 777-782.

Astronomy and Astrophysics

Astronomy

1

Open Clusters And Associations: Individual (Χ Persei, H Persei), Stars: Formation, Stars: Pre-Main-Sequence, X-Rays: Stars

Scientific paper

We have studied X-rays from the double cluster h and χ Per with an 11 ks ROSAT position-sensitive proportional counter (PSPC) observation. Emission is concentrated toward the two cluster centers. Whether the emission is diffuse emission or from a population of unresolved faint sources is uncertain because the resolution is poor at the distance of the clusters (2.4 kpc). Twenty-three sources were found with an X-ray luminosity of logL=31.5 ergs s-1 or greater. These sources were found in the cluster nuclei, between the clusters, and in a halo around the cluster pair. The ROSAT PSPC error circle is too large for the identification of X-ray sources with individual optical objects. However, because of a lack of correlation between X-ray sources and B stars, we conclude that the X-rays are produced by late spectral type pre-main-sequence stars. The X-ray sources are brighter than all but the very brightest sources in the younger Orion Nebula cluster, which makes them important in tracing the final stages approaching the main sequence. Based on observations made with the ROSAT satellite.

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