Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998an....319..215p&link_type=abstract
Astronomische Nachrichten, vol. 319, no. 4, p. 215.
Astronomy and Astrophysics
Astronomy
15
Scientific paper
The present investigation examines possible optical counterparts to 130 X-ray sources in the region of the alpha Persei open cluster (d ~ 170pc, age ~ 50 Myr) resulting from the analysis of three 22-25 ksec ROSAT PSPC pointings. In the same manner as for 73 X-ray sources from a raster survey in alpha Per (Prosser & Randich 1998), CCD photometry is employed to obtain magnitudes and colors for stars/objects close to the X-ray positions, with additional echelle and low-dispersion Hα spectra provided for some stars. For almost 60 X-ray sources, an optical counterpart with photometry acceptable for cluster membership is identified, some of which can be excluded from membership on the basis of discrepant radial velocity or X-ray characteristics. On the order of 30 new members or likely members associated with X-ray sources have been identified based on available data. A photometric rotation period has been obtained for one rapid rotator identified in X-rays.
Prosser C. P.
Randich Sofia
Simon Theodore
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