Further observations of the Orion Nebula cluster

Details Further observations of the Orion Nebula cluster Further observations of the Orion Nebula cluster

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.171..219p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 171, Apr. 1975, p. 219-234.

Astronomy and Astrophysics

Astronomy

42

Infrared Astronomy, Interstellar Extinction, Nebulae, Star Clusters, Stellar Evolution, Stellar Spectrophotometry, Cosmic Dust, Early Stars, Tables (Data), Ubv Spectra, Variable Stars

Scientific paper

New spectral types for 16 stars, UBVRI photometry for 13 stars and UBVRIHKL photometry for 35 stars in the Orion Nebula cluster are presented. Analysis of these data together with those of Penston (1973) shows that the reddening law in the cluster is normal. Previous claims for high ratios of total to selective absorption are caused by mistaking infrared emission for a hole in the absorption at that wavelength. The distance modulus of M42 is 8.0 + or - 0.1 mag. Star formation in the cluster has been in progress over the last 10 million yr. The infrared colors of cluster stars are correlated with their range of variation in the optical region.

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