Visual and infrared observations of late-type supergiants in the southern sky

Abstract

view Abstract Citations (42) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Visual and infrared observations of late-type supergiants in the southern sky Humphreys, R. M. ; Ney, E. P. Abstract Spectral types and photometry ranging from 0.4 to 18 microns are given for 54 late-type stars, including 21 supergiants. The infrared observations of the supergiants confirm the dependence of the strength of the 10-micron silicate emission feature on the spectral type and luminosity class of the star. The long-wavelength data are also used to determine the interstellar extinction by fitting an appropriate blackbody to the infrared observations. The deviation from the blackbody at the shorter wavelengths is then attributed to interstellar absorption and absorption by TiO. This method is particularly useful when the short-wavelength photometry is contaminated by a close companion. The M supergiant AH Sco has excess radiation between 1.5 and 8 microns similar to the NML Tauri-type infrared stars. This excess energy resembles free-free emission. Publication: The Astrophysical Journal Pub Date: December 1974 DOI: 10.1086/153282 Bibcode: 1974ApJ...194..623H Keywords: Infrared Astronomy; Late Stars; Stellar Spectrophotometry; Supergiant Stars; Visual Photometry; Black Body Radiation; Infrared Stars; Interstellar Extinction; M Stars; Stellar Luminosity full text sources ADS | data products SIMBAD (59) GCPD (1)