Infrared Spectroscopy of Radio-Luminous OH/IR Stars
Abstract
Low-resolution 1.5-2.5 μm spectra for 21 radio-luminous OH/IR stars are presented. These spectra divide into two broad classes. Those with very strong water-vapor absorption closely resemble the spectra of classified Mira variables and are classified Type VM. Those with weaker water-vapor absorption, but still showing strong CO absorption, resemble the spectra of true core-burning supergiants and are classified Type SG. Comparison of the classification of 30 radio-luminous OH/IR stars with their ΔV's and luminosities suggests this classification is a good indicator of the intrinsic nature of the underlying star. There is some evidence, however, that some true supergiants (massive main-sequence progenitors) develop the pulsation properties and photospheric characteristics of the Mira-like OH/IR stars when they become optically obscured OH/IR stars.
- Publication:
-
The Astronomical Journal
- Pub Date:
- January 1988
- DOI:
- 10.1086/114624
- Bibcode:
- 1988AJ.....95..158J
- Keywords:
-
- Hydroxyl Radicals;
- Infrared Spectroscopy;
- Infrared Stars;
- Radio Stars;
- Carbon Monoxide;
- Mira Variables;
- Supergiant Stars;
- Water Vapor;
- Astronomy;
- STARS: ABUNDANCES;
- STARS: SPECTRAL CLASSIFICATION;
- INFRARED: SOURCES;
- RADIO SOURCES: GENERAL