2020JAVSO..48..140C

Query : 2020JAVSO..48..140C

2020JAVSO..48..140C - J. Am. Assoc. Variable star obs., 48, 140 (2020/June-0)

Systematic Effects in the Visual Estimation of the Brightness of Red Variable Stars.

CADMUS R.R.Jr

Abstract (from CDS):

Visual brightness estimates for red variable stars are complicated by a number of effects. These phenomena have been investigated by comparing visual estimates with V-band photometric measurements. The differences between these quantities for individual stars often vary with the V magnitude at the time of the measurement in a way that is different from the collective trend for many stars and corresponds to an underestimate of the full amplitude of variation by visual observers. This may result from biases introduced in the estimation process, specifically in the choice of comparison stars and in the interpolation of the brightness of the variable between them. These results may shed some light on the factors affecting the transformation between visual estimates and photometric V values for red stars and provide some guidance in the use of that transformation. They also provide insight into the visual estimation process itself.

Abstract Copyright: ©2020: The American Association of Variable Star Observers

Journal keyword(s): Color Equation (269) - Photometric Photometry (1225) - Semi-regular Variable Stars (1444) - Visual Observation (1778)

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 37

goto View the references in ADS

Number of rows : 37
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 V* RX Boo AB* 14 24 11.6253191184 +25 42 13.394221596   9.23 8.60     M7.5-M8 457 0
20 V* V Boo AB* 14 29 45.2660481288 +38 51 40.661203608   9.73 8.46     M5+-6.5e 120 0
21 V* RW Boo AB* 14 41 13.3762067784 +31 34 19.711947072 10.23 9.34 8.00     M5III: 70 0
22 V* U Boo Mi* 14 54 19.9627124952 +17 41 43.674783144   12.37 9.80     M4.5e 38 0
23 V* X Lib Mi* 15 36 12.7127986776 -21 09 03.903461532       11.15   M3 39 0
24 V* X Her AB* 16 02 39.1730141112 +47 14 25.265335956   7.64 6.58     M6III 249 0
25 V* SX Her RV* 16 07 27.2518832352 +24 54 29.935580580   9.95 8.60     KIIvw 92 0
26 V* R UMi AB* 16 29 57.8923408176 +72 16 49.165973148   10.69 9.44     O-rich 88 0
27 V* UX Dra C* 19 21 35.5182299784 +76 33 34.557161688   8.81 5.94     C-N5 206 0
28 V* TT Cyg C* 19 40 57.0158460384 +32 37 05.756696400   10.43 10.20     C-N5- 209 0
29 V* S Aql Mi* 20 11 37.4682590352 +15 37 14.587639716   11.50 10.17 9.24   M3-5.5e 67 0
30 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
31 MSB 38 C* 20 36 07.3864144104 +60 05 26.039264496   13.98 9.86 10.3   C-J4+ 127 0
32 V* U Del AB* 20 45 28.2357324504 +18 05 24.138355308 9.30 8.06 6.38     M4-6II-III 134 0
33 V* RS Aqr Mi* 21 10 58.1310733368 -04 01 40.113357312   12.23 9.50     M2 34 0
34 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
35 V* RU Cyg Mi* 21 40 39.0914354280 +54 19 28.954365060   9.14 7.29     M7II-III 113 0
36 V* RS Lac LP* 22 12 52.5204058368 +43 45 00.780147036   11.57 10.68     K0 20 0
37 V* RV Peg Mi* 22 25 36.8115734064 +30 28 21.372380940   14.508 13.491 9.602   M6e 102 0

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