A.2 Kurucz 1993 Atlas of Model Atmospheres
The atlas contains about 7600 stellar atmosphere models for a wide range of metallicities, effective temperatures and gravities. These new LTE models have improved opacities and are computed with a finer wavelength and temperature resolution than the previous Buser-Kurucz atlas installed in the CDBS (crgridbk). The micro-turbulent velocity is 2 km s-1.
The new atlas installed in the CDBS is from the Kurucz database at Goddard Space Flight Center. The original atlas (CD-ROM No. 13) was created on August 22, 1993 and can be obtained from Dr. R. Kurucz.
The atlas includes models of abundances (log_Z) relative to solar of +1.0, +0.5, +0.3, +0.2, +0.1, +0.0, -0.1, -0.2, -0.3, -0.5, -1.0, -1.5, -2.0, -2.5,-3.0, -3.5, -4.0, -4.5, and -5.0. The grid of models cover the gravity range from log_g= 0.0 to +5.0 in steps of +0.5. The range in effective temperature from 3500 K to 50000 K is covered with an uneven grid (see Table A.3). The model spectra cover the ultraviolet (1000A) to infrared (10 microns) spectral range with non-uniform wavelength spacing (see Table A.4).
Table A.3: Grid of temperatures for the models
|
Temperature Range
|
Grid Step
|
| K |
K |
| 3000 - 10000 |
250 |
| 10000 - 13000 |
500 |
| 13000 - 35000 |
1000 |
| 35000 - 50000 |
2500 |
Table A.4: Wavelength coverage for the models
|
Wavelength Range
|
Grid Step
|
| microns |
A |
| 0.10 - 0.29 |
10 |
| 0.29 - 1.00 |
20 |
| 1.00 - 1.60 |
50 |
| 1.60 - 3.20 |
100 |
| 3.20 - 8.35 |
200 |
| 8.35 - 10.0 |
400 |
