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
|
