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Southern search for OH from M supergiants
Results are reported of a search for OH emission from about 50 southernM supergiants, and it is concluded that most optically identified Msupergiants do not have substantial emission at 1612 MHz. Fromexamination of the published OH profiles of unidentified Type II OH/IRstars, it is also concluded that only a small percentage (about 10%) ofthese stars have spectra similar to those of known OH supergiants,suggesting that Type II OH supergiants are an extremely rare class ofobject. A list of unidentified sources which may be supergiants isgiven.
| Visual and infrared observations of late-type supergiants in the southern sky
Spectral types and photometry ranging from 0.4 to 18 microns are givenfor 54 late-type stars, including 21 supergiants. The infraredobservations of the supergiants confirm the dependence of the strengthof the 10-micron silicate emission feature on the spectral type andluminosity class of the star. The long-wavelength data are also used todetermine the interstellar extinction by fitting an appropriateblackbody to the infrared observations. The deviation from the blackbodyat the shorter wavelengths is then attributed to interstellar absorptionand absorption by TiO. This method is particularly useful when theshort-wavelength photometry is contaminated by a close companion. The Msupergiant AH Sco has excess radiation between 1.5 and 8 microns similarto the NML Tauri-type infrared stars. This excess energy resemblesfree-free emission.
| Infrared Surveys of the Southern Milky way. II. Suspected Supergiant M Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972ApJ...176..623A&db_key=AST
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