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.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

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

Simbad objects: 43

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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 - 2026 		#notes
1 V* WZ Cas C* 00 01 15.8567946264 +60 21 19.025920224 8.77 9.47 7.13     C-N7III: 321 0
2 V* RU And Mi* 01 38 36.3237135576 +38 40 13.255137228   13.12 11.42 10.99   M6 24 0
3 V* U Per Mi* 01 59 35.1223207296 +54 49 20.005668912   10.11 8.76 7.20   M5.5-7e 124 0
4 V* RV And Mi* 02 11 02.5658070288 +48 56 45.063471588   11.52 9.80 9.27   M4 39 0
5 V* S Per s*r 02 22 51.7113133056 +58 35 11.422774248 13.22 10.55 7.90     M4.5-7Iae 388 0
6 V* U Cam C* 03 41 48.1758504744 +62 38 54.395692404   11.5 11.00     C-N5 254 0
7 V* W Tau LP* 04 27 57.1933099464 +16 02 36.161255400   11.90 10.26     M3.0III 50 0
8 V* S Aur C* 05 27 07.4585545416 +34 08 58.849073880   13.48 8.20 9.61   C-N5+ 136 0
9 V* X Mon Mi* 06 57 11.8136948784 -09 03 52.156579572 10.09 8.61 7.07 7.10   M3III 87 0
10 V* RZ UMa AB* 08 10 59.7412493352 +65 13 22.121961384   10.84 9.63     M8 47 0
11 V* RT Hya AB* 08 29 41.1540717720 -06 19 07.635332964   9.28 7.00     M7III 83 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 330 0
13 V* U LMi Mi* 09 54 38.6459542752 +36 05 23.948317644   12.26 11.17     M6 22 0
14 V* ST UMa AB* 11 27 50.3780355120 +45 11 06.735697980 9.660 7.960 6.280     M4III 79 0
15 V* Z UMa AB* 11 56 30.2260881624 +57 52 17.648864652   8.88 6.20 6.40   M5IIIv 129 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: 248 0
17 V* SW Vir AB* 13 14 04.3830437280 -02 48 25.130666916 9.24 8.52 6.85     M7III: 274 0
18 V* V CVn Mi* 13 19 27.7658321448 +45 31 37.656251760 9.55 8.39 6.74 6.13   M4-M6e 173 0
19 * tet Aps AB* 14 05 19.8809399288 -76 47 48.342695604 8.10 7.05 5.50     M6.5III: 127 0
20 V* RX Boo AB* 14 24 11.6253191184 +25 42 13.394221596   9.23 8.60     M7.5-M8 457 0
21 V* V Boo AB* 14 29 45.2660481288 +38 51 40.661203608   9.73 8.46     M5+-6.5e 120 0
22 V* RW Boo AB* 14 41 13.3762067784 +31 34 19.711947072 10.23 9.34 8.00     M5III: 70 0
23 V* U Boo Mi* 14 54 19.9627124952 +17 41 43.674783144   12.37 9.80     M4.5e 38 0
24 V* X Lib Mi* 15 36 12.7127986776 -21 09 03.903461532       11.15   M3 39 0
25 V* X Her AB* 16 02 39.1730141112 +47 14 25.265335956   7.64 6.58     M6III 249 0
26 V* SX Her RV* 16 07 27.2518832352 +24 54 29.935580580   9.95 8.60     KIIvw 92 0
27 V* R UMi AB* 16 29 57.8923408176 +72 16 49.165973148   10.69 9.44     O-rich 88 0
28 V* RW Sgr Mi* 19 13 54.5952059112 -18 51 42.051932316   10.64 9.00     M3(III)e 38 0
29 V* UX Dra C* 19 21 35.5182299784 +76 33 34.557161688   8.81 5.94     C-N5 206 0
30 V* TT Cyg C* 19 40 57.0158460384 +32 37 05.756696400   10.43 10.20     C-N5- 209 0
31 V* S Aql Mi* 20 11 37.4682590352 +15 37 14.587639716   11.50 10.17 9.24   M3-5.5e 67 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-N5.5 187 0
33 V* BC Cyg s*r 20 21 38.5478957040 +37 31 58.925226936   14.61 11.30     M3.5Ia 171 0
34 MSB 38 C* 20 36 07.3864144104 +60 05 26.039264496   13.98 9.86 10.3   C-J4+ 127 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 186 0
36 V* U Del AB* 20 45 28.2357324504 +18 05 24.138355308 9.30 8.06 6.38     M4-6II-III 134 0
37 V* RS Aqr Mi* 21 10 58.1310733368 -04 01 40.113357312   12.23 9.50     M2 34 0
38 V* W Cyg AB* 21 36 02.4974143922 +45 22 28.523281074 8.21 6.97 5.38 3.03 0.89 M4e-M6eIII 189 0
39 V* RU Cyg Mi* 21 40 39.0914354280 +54 19 28.954365060   9.14 7.29     M7II-III 113 0
40 V* RS Lac LP* 22 12 52.5204058368 +43 45 00.780147036   11.57 10.68     K0 20 0
41 V* RV Peg Mi* 22 25 36.8115734064 +30 28 21.372380940   14.508 13.491 9.602   M6e 102 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 209 1
43 V* EU And C* 23 19 58.8818386848 +47 14 34.575341784   12.84 10.38     C-J5- 95 0

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