Other
Scientific paper
Dec 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972bott....6..161a&link_type=abstract
Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 6, pp. 161-178 (1972) (http://www.astroscu.unam.mx/~bott/)
Other
3
Galaxy: Open Clusters And Associations: Individual (Orion), Stars: Variables: Other (Flare), Stars: Emission-Line, Be
Scientific paper
Multi-colour photographic photometry for 279 flare stars and emission stars in the Orion aggregate is presented. These objects depart entirely from the standard UBVR colour relations for main sequence stars. A comparative colorimetric study indicates that the presence of eH_α is a useful criterion on a statistical basis for separating out the more anomalous objects in the colour-magnitude and two-colour arrays. The blueward trend of stars of lower luminosity towards the main sequence in the B-V/V diagram, already evident at V ~ 15^m, takes the form of a band crossing the main sequence entirely at V ~ 16^m, B-V ~ 1^m3. Non-emission flare stars generally appear at constant brightness at photographic accuracies in the UBVR bands. An interesting feature of the V-R/V diagram is the segregation of quiescent flare stars and emission objects which is possibly associated with the nature of the colour and magnitude variations of these stars. Evolutionary interpretations in terms of pre-main sequence tracks for stars of discrete mass are also suggested.
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