RR Lyrae 2012 campaign
I am participating with Francois Kugel to a campaign of observation of RR Lyrae.
The campaign is organised by Jean-Francois Leborgne. More information at the following links:
Francois takes images with a 80mm F/5 refractor, a ST8300 CCD camera (2x2 binning) and a IR 742nm filter. I am processing the images remotely with AsPyLib.
Here is an example of lightcurve obtained:
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Field map
The results on RR Lyrae are communicated to J.F. Leborgne and will be used together with other measurements.
It turns out that there are many interesting variables in the observed field. In the map below, the (1) and (2) green stars are the reference and check stars. The (1) purple star is RR Lyrae, all other purple stars are variables.
Here is a summary of the information found on AAVSO-VSX (there are other variable stars but they are either less interesting or weaker).
I started to measure these stars for each night when RR Lyrae was observed. Lightcurves can be found below.
| Star number on map | Dist. to RR Lyr (arcmin) | Name(s) | Alpha (J2000) | Delta (J2000) | Constellation | Var. type | Period (days) | Magnitude / band |
| 1 | 0.0 | RR Lyr | 19 25 27.91 | +42 47 03.7 | Lyr | RRAB | 0.56686776 | 7.06-8.12 V |
| 2 | 4.22 | V0589 Lyr | 19 25 31.84 | +42 51 13.0 | Lyr | EW | 0.6962 | 11.6-12 R1 |
| 3 | 21.03 | ROTSE1 J192351.77+425833.4 | 19 23 51.77 | +42 58 33.5 | Lyr | LPV | -- | 10.46-0.353 R1 |
| 4 | 16.77 | ASAS J192408+4239.0 | 19 24 7.74 | +42 39 01.7 | Lyr | LPV | 17.54 | 11.683-0.21 V |
| 5 | 18.77 | HQ Lyr ASAS J192634+4232.6 ROTSE1 J192633.33+423236.5 |
19 26 33.32 | +42 32 39.2 | Lyr | M | 289.5 306 -- |
12.8-17.9 B 9.316-2.4 Ic 11.59-1.431 R1 |
| 6 | 26.68 | ASAS J192637+4223.7 ROTSE1 J192637.41+422337.7 NSVS J1926374+422337 |
19 26 37.38 | +42 23 38.4 | Lyr | LPV LPV L: |
105.7 -- 86 |
12.097-0.94 V 10.11-0.578 R1 9.771-0.404 R1 |
| 7 | 31.8 | ASAS J192731+4224.3 NSVS 5545730 |
19 27 30.66 | +42 24 40.4 | Lyr | LPV SR|L |
69.1 69 |
10.406-1.4 Ic 11.651-12.289 R1 |
| 8 | 34.3 | ASAS J192731+4221.4 | 19 27 31.44 | +42 21 23.5 | Lyr | LPV | 24.7 | 11.171-0.28 V |
| 9 | 32.23 | ROTSE1 J192512.90+421455.2 NSVS J1925129+421455 ASAS J192513+4215.0 |
19 25 12.91 | +42 14 57.3 | Lyr | LPV L: L |
-- 154 -- |
12.05-0.423 R1 11.621-0.657 R1 9.886-0.23 Ic |
| 10 | 44.86 | ASAS J192857+4224.0 NSVS 5547408 |
19 28 57 42 | +42 23 60 | Cyg | LPV SR|L |
332 324 |
14.029-0.58 V 11.965-12.977 R1 |
| 11 | 54.98 | ASAS J192747+4158.4 | 19 27 46.91 | +41 58 26.2 | Lyr | LPV | 45.73 | 9.15-0.62 V |
| 12 | 48.71 | KID 7821010 | 19 25 16.77 | +43 35 43.7 | Lyr | EA | 24.238432 | 10.816-? Kp |
Lightcurves
In the plots below, each magnitude point is an average value taken over ~100 measurements. The uncertainty is just the rms noise during the observations (I do not reduce it by sqrt(N) for N observations).
First the check star:
Then the variables. V11 is disregarded because it is often saturated or close to saturation on the pictures. In general the measured magnitudes are higher than the official values in the table above due to the IR filter used for the observations, with cut-off at 742nm:
