High luminosity stars. I. UBV intrinsic colors.
Abstract
The intrinsic colors were determined as a function of luminosity for the Galaxy and Magellanic clouds to compare the intrinsic colors of Magellanic Cloud stars with those of galactic stars. For the galactic stars, the relations agree with the calibration function of the spectral type except for a higher intrinsic color range for the supergiants. The luminous supergiants are redder than the calibration adopted for Ia supergiants, and the relations for the Magellanic clouds may be considered the same for the two clouds, but show important differences from those of the galactic stars. For a given point in the color-color diagram, the Magellanic cloud stars are one or two magnitudes brighter than galactic ones, which implies that the (B-V) of the Magellanic cloud stars are bluer. An uncertainty in the absolute position shows that this set of sequences permits the determination of differences in color excess within the Magellanic Clouds, but the mean color excess is an approximation.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1979
- Bibcode:
- 1979A&A....79..143D
- Keywords:
-
- Hot Stars;
- Magellanic Clouds;
- Stellar Luminosity;
- Supergiant Stars;
- Ubv Spectra;
- A Stars;
- B Stars;
- Calibrating;
- Color-Color Diagram;
- O Stars;
- Radial Velocity;
- Star Clusters;
- Stellar Magnitude;
- Astrophysics;
- Absolute Magnitudes:Supergiants;
- Magellanic Clouds:Supergiants;
- Supergiants:Two-Color Diagrams