2021AJ....161...75C

Query : 2021AJ....161...75C

2021AJ....161...75C - Astron. J., 161, 75-75 (2021/February-0)

The relationship between photometric measurements and visual magnitude estimates for red stars.

CADMUS R.R.

Abstract (from CDS):

The nature of the relationship between visual brightness estimates for red stars and the corresponding V magnitudes has been investigated by comparing visual estimates in the American Association of Variable Star Observers database to photoelectric photometry of 39 semiregular variable stars obtained at Grinnell College over a 30 yr period. A general mathematical description of this relationship has been developed, but it applies only approximately for many individual stars because the actual relationship can be quite different for different stars. The overall trends should apply to visual magnitude estimates for red stars generally. These results are based on far more data over a wider range of color than was the case in earlier work and should provide a more robust description of the relationship between photometric measurements and visual estimates. A number of other issues related to visual magnitude estimates are also addressed.

Journal keyword(s): Visual observation - Photoelectric photometry - Semi-regular variable stars - Color equation

Simbad objects: 43

Full paper

View the references in ADS

Number of rows : 43

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	V* WZ Cas	C*	00 01 15.8567946264	+60 21 19.025920224	8.77	9.47	7.13			C-N7III:	313	0
2	V* RU And	Mi*	01 38 36.3237135576	+38 40 13.255137228		13.12	11.42	10.99		M6	21	0
3	V* U Per	Mi*	01 59 35.1223207296	+54 49 20.005668912		10.11	8.76	7.20		M5.5-7e	113	0
4	V* RV And	Mi*	02 11 02.5658070288	+48 56 45.063471588		11.52	9.80	9.27		M4	34	0
5	V* S Per	s*r	02 22 51.7113133056	+58 35 11.422774248	13.22	10.55	7.90			M4.5-7Iae	373	0
6	V* U Cam	C*	03 41 48.1758504744	+62 38 54.395692404		11.5	11.00			C-N5	243	0
7	V* W Tau	LP*	04 27 57.1933099464	+16 02 36.161255400		11.90	10.26			M6	43	0
8	V* S Aur	C*	05 27 07.4585545416	+34 08 58.849073880		13.48	8.20	9.61		C-N5+	127	0
9	V* X Mon	Mi*	06 57 11.8136948784	-09 03 52.156579572	10.09	8.61	7.07	7.10		K5-M6e	80	0
10	V* RZ UMa	LP*	08 10 59.7412493352	+65 13 22.121961384		10.84	9.63			M8	43	0
11	V* RT Hya	LP*	08 29 41.1540717720	-06 19 07.635332964		9.28	7.00			M7III	74	0
12	V* RS Cnc	S*	09 10 38.7970163421	+30 57 47.291122681	8.65	7.62	5.95	3.06	0.73	M6S	310	0
13	V* U LMi	Mi*	09 54 38.6459542752	+36 05 23.948317644		12.26	11.17			M6	19	0
14	V* ST UMa	LP*	11 27 50.3780355120	+45 11 06.735697980	9.660	7.960	6.280			M4III	71	0
15	V* Z UMa	LP*	11 56 30.2260881624	+57 52 17.648864652		8.88	6.20	6.40		M5IIIv	119	0
16	V* RY Dra	C*	12 56 25.9112361600	+65 59 39.811665876	15.56	9.44	6.34	4.34	2.91	C-N3III:	235	0
17	V* SW Vir	AB*	13 14 04.3830437280	-02 48 25.130666916	9.24	8.52	6.85			M7III:	259	0
18	V* V CVn	Mi*	13 19 27.7658321448	+45 31 37.656251760	9.55	8.39	6.74	6.13		M4-M6e	164	0
19	* tet Aps	LP*	14 05 19.8809399288	-76 47 48.342695604	8.10	7.05	5.50			M6.5III:	121	0
20	V* RX Boo	AB*	14 24 11.6253191184	+25 42 13.394221596		9.23	8.60			M7.5-M8	437	0
21	V* V Boo	LP*	14 29 45.2660481288	+38 51 40.661203608		9.73	8.46			M5+-6.5e	115	0
22	V* RW Boo	LP*	14 41 13.3762067784	+31 34 19.711947072	10.23	9.34	8.00			M5III:	59	0
23	V* U Boo	Mi*	14 54 19.9627124952	+17 41 43.674783144		12.37	9.80			M4.5e	33	0
24	V* X Lib	Mi*	15 36 12.7127986776	-21 09 03.903461532				11.15		M3	30	0
25	V* X Her	AB*	16 02 39.1730141112	+47 14 25.265335956		7.64	6.58			M6III	235	0
26	V* SX Her	RV*	16 07 27.2518832352	+24 54 29.935580580		9.95	8.60			KIIvw	81	0
27	V* R UMi	LP*	16 29 57.8923408176	+72 16 49.165973148		10.69	9.44			M7III:e	81	0
28	V* RW Sgr	Mi*	19 13 54.5952059112	-18 51 42.051932316		10.64	9.00			M3(III)e	34	0
29	V* UX Dra	C*	19 21 35.5182299784	+76 33 34.557161688		8.81	5.94			C-N5	198	0
30	V* TT Cyg	C*	19 40 57.0158460384	+32 37 05.756696400		10.43	10.20			C-N5-	199	0
31	V* S Aql	Mi*	20 11 37.4682590352	+15 37 14.587639716		11.50	10.17	9.24		M3-5.5e	63	0
32	V* RS Cyg	C*	20 13 23.6616874008	+38 43 44.470030872	13.26	9.36	6.50	4.38	2.82	C-N5.5	179	0
33	V* BC Cyg	s*r	20 21 38.5478957040	+37 31 58.925226936		14.61	11.30			M3.5Ia	164	0
34	MSB 38	C*	20 36 07.3864144104	+60 05 26.039264496		13.98	9.86	10.3		C-J4+	119	0
35	V* EU Del	LP*	20 37 54.7276970976	+18 16 06.894742044	8.42	7.38	5.89	3.24	0.97	M6III	175	0
36	V* U Del	LP*	20 45 28.2357324504	+18 05 24.138355308	9.30	8.06	6.38			M4-6II-III	126	0
37	V* RS Aqr	Mi*	21 10 58.1310733368	-04 01 40.113357312		12.23	9.50			M2	27	0
38	V* W Cyg	LP*	21 36 02.4974143922	+45 22 28.523281074	8.21	6.97	5.38	3.03	0.89	M4e-M6eIII	179	0
39	V* RU Cyg	Mi*	21 40 39.0914354280	+54 19 28.954365060		9.14	7.29			M7II-III	108	0
40	V* RS Lac	LP*	22 12 52.5204058368	+43 45 00.780147036		11.57	10.68			K0	15	0
41	V* RV Peg	Mi*	22 25 36.8115734064	+30 28 21.372380940			9.00			M6e	95	0
42	* bet Gru	LP?	22 42 40.05027	-46 53 04.4752	5.33	3.73	2.11	0.20	-1.57	M4.5III	201	1
43	V* EU And	C*	23 19 58.8818386848	+47 14 34.575341784		12.84	10.38			C-J5-	88	0

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