Near-infrared photometry of unidentified IRC stars. III. The Mira variables of spectral type M10.
Abstract
Less than two dozen visually bright Mira variables are known to exceed the extremely late spectral type of M9.5 at minimum light. Near-infrared photometry of the reddest unidentified sources in the Two-Micron Sky Survey has led to the identification and spectral classification of a group of 38 additional M type Mira variables that reach M9.5, but which on the average exhibit significantly larger amplitudes at 1 micron, longer periods, later spectral types, and redder near-infrared colors than the ones whose mean properties previously defined the coolest Mira variables. Periods and epochs of maximum light are given for 13 stars. Near-infrared magnitudes and photometric spectral types are also given for 107 additional unidentified IRC stars having less extreme spectral types, including 13 highly reddened early-M supergiants and four cool carbon stars.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- May 1985
- DOI:
- 10.1086/191034
- Bibcode:
- 1985ApJS...58..167L
- Keywords:
-
- Cool Stars;
- Infrared Stars;
- Late Stars;
- M Stars;
- Mira Variables;
- Stellar Spectrophotometry;
- Variable Stars;
- Carbon Stars;
- Light Curve;
- Near Infrared Radiation;
- Red Giant Stars;
- Sky Surveys (Astronomy);
- Stellar Magnitude;
- Supergiant Stars;
- Astronomy