Airborne photometric observations between 1.25 and 3.25 microns of late-type stars

Details Airborne photometric observations between 1.25 and 3.25 microns of late-type stars Airborne photometric observations between 1.25 and 3.25 microns of late-type stars

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83..188n&link_type=abstract

Astronomical Journal, vol. 83, Feb. 1978, p. 188-193. Swedish Board for Space Activities

Astronomy and Astrophysics

Astronomy

6

Airborne Equipment, Cn Emission, Infrared Astronomy, Late Stars, Stellar Spectrophotometry, Abundance, Astronomical Observatories, Atmospheric Attenuation, Carbon Monoxide, Lear Jet Aircraft, M Stars, Stellar Atmospheres, Water Vapor

Scientific paper

The stars Alpha Aur (G5 III + G0 III), Alpha Boo (K2 IIIp), Alpha Ori (M1-M2 Ia-Ib), Alpha Sco (M1.5 Iab), Mu Gem (M3 III), and Alpha Her (M5 Ib-II) have been observed using interference filters in five photometric bands between 1.25 and 3.25 microns during seven flights with NASA's Lear Jet Infrared Observatory. The filters were designed to measure molecular features, primarily from CN and CO, and continuum fluxes. By calibrating the photometer in the laboratory against a stabilized blackbody source, relative flux curves have been derived. The energy distributions and the strength of molecular features are discussed. The most interesting result obtained is that the fluxes from Mu Gem and Alpha Her in the filter centered at 3.25 microns seem to be depressed by at least some tenths of a magnitude. Tentatively this depression is proposed to be due to the wings of the two vibration-rotation bands (about 2.7 microns) of hot water vapor. Since water vapor is an important opacity source and its abundance is a sensitive C/O indicator, the proposed interpretation makes renewed efforts to detect water bands in early M stars highly desirable.

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