Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192..467w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 192, Aug. 1980, p. 467-480. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
102
Early Stars, Infrared Astronomy, Infrared Photometry, Infrared Spectrophotometers, Interstellar Extinction, Stellar Spectrophotometry, Light Curve, Shell Stars, Stellar Luminosity, Supergiant Stars
Scientific paper
The paper presents infrared photometry tied to the JHKL (1.2-3.5 microns) broadband photometric system for 229 southern early-type stars. To determine data for stars of low reddening intrinsic visual-IR color indices were used; the E(V-K)/E(B-V) diagram was applied to evaluate the ratio of total selective extinction. A mean value of R = 3.12 plus or minus 0.05 was found for stars close to the galactic plane, but a higher value of R (about 4.0) applies to the Orion and Sco-Oph regions. Infrared two-color diagrams were used to investigate the occurrence of infrared excess emission in different classes of shell star; no excesses were found for supergiants or Of stars. It is concluded that the anomalous position HD 164740 in the two-color diagrams is produced by strong infrared excess and not by a peculiar extinction law.
van Breda Ian G.
Whittet Doug C. B.
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