RCOM: OGLE-IV REAL TIME MONITORING OF R CrB VARIABLES



OGLE Monitoring system of R Coronae Borealis type variable stars (RCOM) is the OGLE real time data analysis utility designed to provide real time photometry of R CrB type variable stars located in the fields regularly monitored by the OGLE-IV Survey (see maps).

RCrB stars are known to undergo large brightness variations with amplitude reaching a few magnitudes. Sudden drops or rise of brightness are unpredictable and the OGLE RCOM system can serve as the Early Warning System for these stars allowing full variety of follow up observations in crucial phases when the objects start a rapid rise of fading in brightness.

The list of monitored objects can be easily extended. Input from the astronomical community is most welcome. The photometry is updated regularly, typically after every clear night during the target observing season. Unfortunately, some RCrB stars are too bright, so their images are overexposed in the OGLE-IV reference images and automatic long term monitoring is not possible.

The photometric data are taken in the I-band. OGLE-IV I-band interference filter very closely reproduces the standard system band. Presented here photometry comes from the image reduction obtained in almost real time at the telescope and it is only roughly calibrated (accuracy of the zero point is estimated to be +/-0.15 mag).


Photometric data presented here can also be found on OGLE Anonymous FTP Archive.


OGLE-III RCOM monitoring photometric data can be found HERE.


If you have any questions or comments, send us a message.


The OGLE RCOM photometry is provided here for information purposes only to facilitate the community monitoring those R CrB stars and follow up observations. Please contact us if you want to use the data for publication. We may require to be co-authors when our photometry is important for analysis.

When referring to the OGLE RCOM system, please cite the paper by Udalski, 2008, Acta Astron., 58, 187 and provide the WWW address of the RCOM system or the OGLE WWW home page.


The following table contains the current list of monitored objects.


Name Field Star No RA (J2000) Dec (J2000)
RAW-476 SMC720.20 78 0:48:22.96 -73:41:04.7
MSX-SMC-014 SMC720.04 9653 0:46:16.32 -74:11:13.6
MSX-SMC-155A SMC719.09 738 0:57:18.15 -72:42:35.3
MSX-SMC-155B SMC726.32 4530 0:57:18.14 -72:42:35.3
MH95-431 SMC720.07 6777 0:40:14.71 -74:11:21.6
RAW-21A SMC713.02 353 0:37:47.12 -73:39:02.3
RAW-21B SMC720.25 338 0:37:47.11 -73:39:02.4
RAW-233 SMC719.15 53 0:44:07.49 -72:44:16.4
EROS2-SMC-RCB-4 SMC725.13 12120 1:04:52.87 -72:04:02.7
EROS2-SMC-DYPER-3 SMC719.10 33304 0:55:54.95 -72:35:11.7
EROS2-SMC-DYPER-4 SMC718.10 17 0:56:35.48 -71:32:33.3
EROS2-SMC-DYPER-6 SMC720.30 33385 0:44:56.45 -73:12:24.7
MACHO-118.18666.100 BLG505.01 70587 17:59:52.23 -29:39:50.5
EROS2-CG-RCB-1 BLG500.04 23191 17:52:20.04 -29:03:31.8
EROS2-CG-RCB-2 BLG500.11 68631 17:52:48.70 -28:45:18.9
EROS2-CG-RCB-3 BLG506.03 22727 17:58:28.32 -30:51:16.6
EROS2-CG-RCB-5 BLG603.29 23 17:46:00.34 -33:47:56.6
EROS2-CG-RCB-8 BLG675.06 96226 17:39:20.74 -27:57:22.7
EROS2-CG-RCB-10 BLG632.12 114555 17:45:31.42 -23:32:24.6
EROS2-CG-RCB-11 BLG638.15 79978 17:48:41.57 -23:00:26.7
EROS2-CG-RCB-14 BLG523.05 133481 18:13:14.88 -27:49:40.9
OGLE-GC-RCB-CAND-1 BLG501.21 27728 17:52:14.92 -29:38:30.3
OGLE-GC-RCB-CAND-2 BLG535.05 22392 17:51:19.50 -32:43:21.5
MACHO-051551.8-691008 LMC503.23 14683 5:15:51.81 -69:10:08.7
MACHO-051651.8-684517 LMC503.30 66104 5:16:51.96 -68:45:16.8
MACHO-051956.0-694806 LMC503.04 13737 5:19:55.94 -69:48:05.8
MACHO-051131.4-675552 LMC511.01 45 5:11:31.38 -67:55:50.7
KDM-2373 LMC509.18 52 5:10:28.53 -69:47:04.4
MACHO-050344.7-693812 LMC509.22 28510 5:03:44.66 -69:38:11.7
MACHO-052633.8-690733A LMC503.17 22409 5:26:33.91 -69:07:33.3
MACHO-052633.8-690733B LMC517.07 65314 5:26:33.91 -69:07:33.2
MACHO-052624.7-711113 LMC515.16 15178 5:26:24.52 -71:11:11.8
MACHO-053213.3-695559 LMC516.12 102562 5:32:13.34 -69:55:57.8
KDM-5651A LMC515.17 13754 5:41:23.52 -70:58:01.7
KDM-5651B LMC552.07 47713 5:41:23.52 -70:58:01.7
KDM-7101 LMC558.04 16 6:04:05.47 -72:51:22.9
EROS2-LMC-RCB-1 LMC502.31 52036 5:14:40.23 -69:58:39.9
EROS2-LMC-RCB-3A LMC510.25 32406 4:59:35.83 -68:24:44.8
EROS2-LMC-RCB-3B LMC532.01 20229 4:59:35.82 -68:24:44.8
EROS2-LMC-RCB-4 LMC514.27 199 5:39:36.98 -71:55:46.8
EROS2-LMC-RCB-6 LMC557.02 711 6:12:10.50 -74:05:10.0
EROS2-LMC-RCB-7 LMC501.09 27800 5:24:43.64 -71:47:26.6
EROS2-LMC-RCB-8 LMC507.14 72 4:58:48.36 -72:37:43.4
EROS2-LMC-DYPER-1 LMC531.02 18367 4:56:28.53 -69:39:12.6
EROS2-LMC-DYPER-2 LMC609.29 8 6:18:46.60 -67:00:59.4
EROS2-LMC-DYPER-3 LMC556.11 261 5:44:04.01 -65:46:00.5
EROS2-LMC-DYPER-4 LMC516.25 32434 5:25:54.97 -69:43:53.9
EROS2-LMC-DYPER-5 LMC551.11 14 5:50:15.53 -71:57:39.6
EROS2-LMC-DYPER-6 LMC516.31 21053 5:29:27.23 -69:22:32.5
EROS2-LMC-DYPER-8 LMC515.18 43317 5:39:00.33 -70:58:01.2
EROS2-LMC-DYPER-9 LMC531.21 5601 4:52:58.44 -69:10:27.5
EROS2-LMC-DYPER-10 LMC568.32 8 6:05:35.33 -68:54:54.0
EROS2-LMC-DYPER-11 LMC516.06 19609 5:29:22.60 -70:19:35.8
EROS2-LMC-DYPER-12 LMC518.30 19654 5:29:26.19 -67:00:22.6
EROS2-LMC-DYPER-13 LMC503.20 83608 5:20:22.86 -69:04:42.9
EROS2-LMC-DYPER-14 LMC517.07 22297 5:27:32.32 -69:05:35.4
EROS2-LMC-DYPER-15 LMC516.22 90251 5:30:43.25 -69:38:51.8
EROS2-LMC-DYPER-16 LMC516.11 36628 5:35:15.40 -69:57:43.7
EROS2-LMC-DYPER-17 LMC519.09 14924 5:35:24.08 -66:24:15.2
OGLE-LMC-RCB-02 LMC510.07 44353 5:01:00.37 -69:03:43.2
OGLE-LMC-RCB-03 LMC511.30 74 5:04:40.53 -67:03:11.8
OGLE-LMC-RCB-07 LMC504.24 4876 5:14:46.20 -67:55:47.6
OGLE-LMC-RCB-09 LMC503.13 120109 5:16:48.11 -69:22:22.1
OGLE-LMC-RCB-12 LMC503.27 53 5:22:57.37 -68:58:18.8
OGLE-LMC-RCB-15 LMC517.14 39302 5:28:07.68 -68:52:54.3
OGLE-LMC-RCB-16 LMC514.30 19581 5:31:54.25 -71:53:49.6
OGLE-LMC-RCB-21 LMC553.23 16075 5:42:21.92 -69:02:59.4
OGLE-LMC-RCB-22 LMC552.12 53859 5:46:47.74 -70:38:13.5
HV12842 LMC596.09 5837 5:45:02.88 -64:24:22.7
MACHO-6.6575.13 LMC502.28 3N 5:20:48.20 -70:12:12.6
OGLE-LMC507.21-5 LMC507.21 5 5:02:32.27 -72:18:53.6
OGLE-SMC710.08-1 SMC710.08 1 0:50:10.67 -69:43:57.9

Andrzej Udalski

Warsaw University Observatory

Warsaw, Poland

Last updated on Fri Sep 7 09:35:17 CEST 2018