Echelle Flux Standards

A good set of bright standard stars for flux calibration is provided by Humuy et al. (1992; PASP 104, 533). Try 20 sec as a first guess at an exposure time. These are all equatorial:


                               Secondary Standard Stars


 HR   Star           RA (2000) DEC     MK Type    (U-B)   (B-V)    V     (V-R)   (V-I)

9087 29 Psc      00 01 49.3 -03 01 39  B7 III-IV -0.501  -0.136  5.120  -0.052  -0.122 
 718 xi^2 Cet    02 28 09.5  08 27 36  B9 III    -0.107  -0.056  4.279  -0.023  -0.063 
1544 pi^2 Ori    04 50 36.7  08 54 01  A1 V         ---   0.01   4.355   0.014   0.039 
3454 eta Hya     08 43 13.4  03 23 55  B3 V      -0.743  -0.200  4.295  -0.083  -0.200 
4468 theta Crt   11 36 40.8 -09 48 08  B9.5 V    -0.18   -0.07   4.700  -0.023  -0.063 
4963 theta Vir   13 09 56.9 -05 32 20  A1 IV     -0.01   -0.00   4.375   0.003   0.010 
5501 108 Vir     14 45 30.1  00 43 02  B9.5 V    -0.080  -0.023  5.681   0.004  -0.026 
7596 58 Aq1      19 54 44.7  00 16 25  A0 III    -0.01    0.10   5.62     ---     ---
7950 epsilon Aqr 20 47 40.5 -09 29 45  A1 V       0.029  -0.001  3.778  -0.005  -0.010 
8634 zeta Peg    22 41 27.6  10 49 53  B8 V      -0.24   -0.09   3.40   -0.037  -0.079

These stars have been calibrated at 16Å intervals, which means that you can get many points per echelle order ( = GOOD!).

flux calibration data in IRAF format.

File names have the format "hr9087.dat", "hr718.dat", etc.

The Hamuy et al. (1992) paper also includes a larger set of much fainter flux standards at southern declinations, measured at 50Å intervals. These are also found in the directory accesed by the above link.