Table of Cohen Primary and Secondary Flux Standard Stars

To help with the planning of observations, the basic properties of Cohen's 2 primary and 10 secondary standards are listed in the following table. Also listed are a few other stars which are often used as mid-IR standards. Most of the K and N magnitudes are taken from papers I (1992, AJ, 104, 1650) and IV (1995, AJ, 110, 275). In Cohen's system, the 0 magnitude flux density is 655 Jy at K and 35.21 Jy at N.

Name	RA (2000)	Dec (2000)	Sp. Type	K	N	Notes
Cohen Primary Standards
Alpha CMa	06 45 09	-16 42 58	A1 V	-1.37	-1.35	()
Alpha Lyr	18 36 56	+38 47 01	A0 V	0.00	0.00	()
Cohen Secondary Standards
Beta And	01 09 43	+35 37 14	M0 III	-1.89	-2.05	()
Alpha Cet	03 02 17	+04 05 23	M1.5 IIIa	-1.7	-1.7	()
Alpha Tau	04 35 55	+16 30 33	K5 III	-2.90	-3.02	()
Beta Gem	07 45 19	+28 01 34	K0 IIIb	-1.12	-1.22	()
Alpha Hya	09 27 35	-08 39 31	K3 II-III	-1.22	-1.31	()
Mu UMa	10 22 20	+41 29 58	M0 III	-0.85	-1.03	()
Gamma Cru	12 31 10	-57 06 47	M3.5 III	-3.16	-3.36	(c)
Alpha Boo	14 15 40	+19 10 57	K1.5 III	-3.04	-3.14	()
Gamma Dra	17 56 36	+51 29 20	K5 III	-1.38	-1.48	()
Beta Peg	23 03 46	+28 04 58	M2.5 II-III	-2.29	-2.44	(a)
Other Standards
Alpha Aur	05 16 41	+45 59 53	G5 IIIe	-1.8	-1.94	()
Gamma Aql	19 46 16	+10 36 48	K3 II	-0.58	-0.78	(b)

Notes to table:
(a) Beta Peg is variable at about the 10% level but is useful for spectral calibration.
(b) Gamma Aql appears in Cohen et al. Paper X as one of the 422 stars with templates.
(c) Gamma Crux may be used as a flux calibration star, but it definitely is not useful as a PSF calibration star since the N-band PSF is found to be 50% larger than those of other standards taken at nearly the same time.

Cohen Primary and Secondary MIR Standards