BRIGHT AND FLAT-SPECTRUM STANDARDS FOR RATIOING AT 10 AND 20 MICRONS

This is a list of bright IR stars for ratioing 10 and 20um low and medium resolution spectra.

At low and medium resolution stars of spectral type K0 and earlier have smooth spectra and effectively no SiO fundamental band, which in later type stars can extend from 7.5um to 10um. Their spectra also should be smooth in the 20um band. Hence they can be used for ratioing both at 10um and 20um. 

The stars of spectral type K1-K5 also are suitable for ratioing low-medium resolution 20um spectra. However, these stars will have SiO bands in the short wavelength half of the 10um window, and hence are (progressively with spectral type) less suitable for ratioing 10um spectra.

To summarize:
     Stars of spectral type K0 and earlier are suitable for 10um and 20um.
     Stars of spectral type K1-K5 are suitable only for 20um.

Coordinates (2000) and V magnitudes are from the Bright Star Catalogue. IR magnitudes are from the literature. 

> -30

GIVEN IN TEXT FORMAT BELOW:

Name	Sp. Type	RA	Dec	V	L’	N	Q
BS 74	K1	0 20	-09	3.6	0.8	-0.4
BS 99	K0	0 26	-42	2.4
BS 165	K3	0 40	31	3.3	0.3
BS 168	K0	0 40	57	2.2	-0.5
BS 188	G9	0 43	-18	2.0	-0.4
BS 334	K2	1 08	-10	3.5	0.8
BS 402	K0	1 24	-8	3.6	1.1	1.0
BS 437	G9	1 30	15	3.6
BS 464	K3	1 38	49	3.6	0.6
BS 603	K3	2 03	42	2.3	-0.8
BS 617	K2	2 07	24	2.0	-0.7	-0.8	-0.8
BS 915	G5	3 04	53	2.9	0.9	0.8
BS1017	F5	3 24	50	1.8	0.5	0.5
BS1030	G6	3 25	9	3.6	1.4
BS1136	K0	3 43	-10	3.5	1.4
BS1409	G9	4 28	19	3.5	1.2
BS1457*	K5	4 36	17	0.8	-2.98	-3.03	-3.09
BS1654	K4	5 05	-22	3.2	-0.3
BS1708*	G8	5 12	46	0.1	-1.87	-1.94	-1.93
BS1713	B8	5 12	-8	0.1	0.08	0.06	-0.3
Name	Sp. Type	RA	Dec	V	L’	N	Q
BS2040	K1	5 50	-36	3.1
BS2473	G8	6 43	25	3.0	0.0	0.0
BS2491*	A1	6 42	-17	-1.5	-1.37	-1.42	-1.36
BS2693	F8	7 08	-26	1.8	0.3	0.0
BS2878	K5	7 29	-43	3.3
BS2943*	F5	7 36	5	0.3	-0.66	-0.76	-0.73
BS2990*	K0	7 42	28	1.1	-1.15	-1.24	-1.21
BS3017	K5	7 45	-38	3.6
BS3045	G6	7 49	-25	3.3	0.8
BS3249	K4	8 17	9	3.5	0.0
BS3461	K0	8 44	18	3.9	1.4
BS3547	G9	8 55	6	3.1	0.7
BS3634	K4	9 08	-43	2.2
BS3748	K3	9 28	-09	2.0	-1.3	-1.4	-1.5
BS3873	G1	9 46	24	3.0	1.0
BS4057	K1	10 20	20	2.6	-0.7	-1.1	-1.1
BS4232	K2	10 50	-16	3.1	0.2
BS4247	K0	10 53	34	3.8	1.2
BS4335	K1	11 09	44	3.0	0.3
BS4377	K3	11 18	33	3.5	0.2
BS4382	G8	11 19	-15	3.6	0.8
BS4450	G7	11 33	-31	3.5	1.4
BS4518	K0	11 46	48	3.5	0.8
BS4630	K3	12 10	-23	3.0	-0.1
Name	Sp. Type	RA	Dec	V	L’	N	Q
BS4786	G5	12 34	-23	2.6	0.6	0.6
BS4932	G8	13 01	11	2.8	0.8
BS5020	G8	13 18	-23	3.0	0.9
BS5235	G0	13 54	18	2.7	1.3
BS5287	K2	14 06	-27	3.3	0.6
BS5288	K	14 06	-36	2.1	-0.3
BS5340	K	14 11	20	0.0	-3.08	-3.17	-3.31
BS5429	K3	14 32	30	3.6	0.6
BS5506	K0	14 44	27	2.4	0.0
BS5602	G8	15 02	40	3.5	1.3
BS5705	K4	15 22	-36	3.6
BS5744	K2	15 24	59	3.3	0.5
BS5787	G8	15 35	-15	3.9	1.4
BS5794	K3	15 37	-28	3.6
BS5854	K2	15 44	06	2.7	0.0
BS5908	G8	15 54	-17	4.1	1.5
BS6075	G9	16 18	-5	3.2	1.0
BS6148	G7	16 30	22	2.8	0.6
BS6212	G0	16 41	32	2.8	1.3
BS6220	G0	16 43	39	3.5	1.2
BS6241	K2	16 50	-34	2.3	-0.4
Name	Sp. Type	RA	Dec	V	L’	N	Q
BS6299	K2	16 57	09	3.2	0.6
BS6418	K3	17 14	37	3.2	-0.2
BS6536	G2	17 30	52	2.8	0.7
BS6556	A5	17 35	13	2.1	1.6
BS6603	K2	17 43	05	2.8	0.1
BS6630	K2	17 50	-37	3.2	0.4
BS6698	K0	17 58	-10	3.3	1.0
BS6705	K5	17 57	51	2.2	-1.5	-1.5	-1.5
BS6746	K0	18 05	3.0	0.6
BS6859	K2	18 21	-30	2.7
BS6869	K0	18 21	-3	3.3	1.0
BS6913	K1	18 28	-25	2.8	0.3
BS7001*	A0	18 35	39	0.0	0.00	0.00	0.00
BS7150	K1	18 58	-21	3.5	0.8
BS7234	K2	19 06	-28	3.3	0.5
BS7264	F2	19 09	-21	2.9 1.7
BS7314	K0	19 16	38	4.4	1.5
BS7417	K3	19 32	28	3.2	0.0
BS7525	K3	19 51	11	2.7	-0.6	-0.7	-0.8
BS7557	A7	19 51	9	0.8	0.2
BS7615	K0	19 56	35	3.9	1.5
Name	Sp. Type	RA	Dec	V	L’	N	Q
BS7776	F8	20 21	-14	3.1	0.8
BS7796	F8	20 22	40	2.2	0.6
BS7924	A2	20 41	45	1.2	0.8	0.6	0.4
BS7949	K0	20 46	34	2.5	0.0
BS8115	G8	21 13	30	3.2	1.0
BS8308	K2	21 44	10	2.4	-1.0		-1.2
BS8414	G2	22 06	0	3.0	0.8
BS8465	K2	22 11	58	3.4	0.0	-0.1
BS8650	G8	22 42	30	2.9	0.6
BS8684	G8	22 49	25	3.5	1.3
BS8812	K2	23 09	-21	3.7	0.9
BS8852	G9	23 16	3	3.7	1.4
BS8892	K0	23 23	-20	4.0	1.3
BS8961	G8	23 37	46	3.8	1.3
Name	Sp. Type	RA	Dec	V	L’	N	Q

* denotes a bright IR standard