Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..577w&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, June 1, 1980, p. 577-584.
Astronomy and Astrophysics
Astronomy
49
Carbon Stars, Infrared Astronomy, Infrared Spectra, Stellar Envelopes, Stellar Models, Stellar Spectrophotometry, Aircraft Instruments, Astronomical Observatories, Continuous Spectra, Least Squares Method, Spectrum Analysis
Scientific paper
Low-resolution spectra of IRC + 10216 have been obtained from 2 to 8.5 microns from NASA's Kuiper Airborne Observatory at an altitude of 12.5 km (41,000 feet). Observations were made during 1976 January and 1977 February. In both sets of data, the spectral flux reaches its maximum between 6.0 and 6.6 microns and the previously reported 3.1-micron feature is observed; no obvious new absorption features have been found. The new data together with other spectral data and measurements of the spatial extent of IRC + 10216 impose conditions that must be met by models of the continuum. Several simple models for 2-8.5 micron radiation are examined. The new continuum data impose a constraint on the size of the grains in the cooler, optically thin part of the object. Earlier photometry has been combined with the present data to yield an improved value of the average period: 644 + or - 17 days. It appears that the variability is irregular and that the minima have been deeper in recent years than they were in 1965-1969.
Erickson Edwin F.
Goebel John Henry
Smith Marcia S.
Strecker Donald W.
Taylor Benjamin J.
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