Definition of the Pleiades Main Sequence in the Hertzsprung-Russell Diagram

Details Definition of the Pleiades Main Sequence in the Hertzsprung-Russell Diagram Definition of the Pleiades Main Sequence in the Hertzsprung-Russell Diagram

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..295h&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 295-298

Physics

5

Scientific paper

The Pleiades main sequence is intrinsically of very small width. Disturbances to this width come primarily from three sources: local interstellar reddening (related to the reflection nebulae), multiplicity and variations in the distance moduli related to the size of the cluster (~20 pc diameter). Walraven 5-channel photometry can be used to remove most of the reddening related effects. A full literature survey was made concerning multiplicity to provide information needed to correct for multiplicity effects. The locus of the resulting corrected main sequence can be determined using Hipparcos parallaxes (van Leeuwen and Hansen-Ruiz 1997), providing a well defined observational isochrone for the study of stellar evolution and stellar structure. Preliminary results are presented.

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