CCD Δa-photometry of 5 open clusters (Paunzen+, 2002)

Details CCD Δa-photometry of 5 open clusters (Paunzen+, 2002) CCD Δa-photometry of 5 open clusters (Paunzen+, 2002)

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ycat..33950823p&link_type=abstract

VizieR On-line Data Catalog: J/A+A/395/823. Originally published in: 2002A&A...395..823P

Computer Science

Clusters: Open, Photometry: Ccd, Photometry: Narrow-Band

Scientific paper

The time scale on which chemical peculiarity in upper main sequence stars begins is unknown. Results from the Hipparcos measurements indicate that the classical chemically peculiar (CP) stars occupy the whole area from the zero age main sequence to the terminal age main sequence. Hubrig et al. (2000ApJ...539..352H) reported that the magnetic fields appear only in stars that have already completed at least approximately 30% of their main sequence life time. Previous observations in the very young Orion OB1 and Scorpio Centaurus associations reveal a percentage of chemically peculiar stars that is significantly smaller (less than 5%) than that of the galactic field (up to 25%). This already indicates that the phenomenon needs at least several Myr to appear. Since no further observations have been published since then, we have observed the five very young (1MyrFor a description of the (Delta a) photometric system, see e.g. : a = g2 - (g1+y)/2 g1 and g2 centered at 502 and 524nm.
(5 data files).

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