Photometric study of the Chamaeleon T-association

Details Photometric study of the Chamaeleon T-association Photometric study of the Chamaeleon T-association

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975aj.....80..117g&link_type=abstract

Astronomical Journal, vol. 80, Feb. 1975, p. 117-124.

Astronomy and Astrophysics

Astronomy

70

Astronomical Photometry, Hertzsprung-Russell Diagram, Nebulae, Star Clusters, Stellar Evolution, Stellar Spectra, Emission Spectra, Infrared Astronomy, Interstellar Extinction, Ubv Spectra

Scientific paper

Optical and infrared photometry was carried out for a large sample of stars in the Chamaeleon dark cloud complex. The distance derived for the complex is 115 pc which makes it the nearest known dark cloud. A study of the stellar population contained within the cloud reveals a wide range of types ranging from a main-sequence A0 star to a large number of Orion population objects. The Chamaeleon complex may represent a stellar cluster intermediate in character between a T-association and an OB-association. The reddening law derived for this dark cloud suggests a value of R, the ratio of total-to-selective extinction, of 5.5; this result is similar to that found for other high gas and dust density regions. An HR diagram was constructed after correcting the observed stellar spectral energy distributions for the effects of reddening and circumstellar emission. The resulting diagram suggests a wide spread in stellar formation time. Finally, the optical and IR emission characteristics of the circumstellar envelopes are outlined briefly.

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