The lists of available calibration fields and stars are given here forvarious FORS1 setups, i.e. for Bessell filters,Gunn filters, Spectroscopy, empty Fields for Twilight Flats and Polarimetry. Thename of the Observation Blocks already prepared by PSO and available forany visiting observer is given, as well as some information on the fieldor star. These OBs can be retrieved from the control room in the /home/visitor/impex/FORS1/ directory. For service mode, PSO staff will use the same observing blocks.
 

Photometric Standard Stars: 1. Bessell filters

Notes: (1)The OB are prepared both with high CCD gain, four-port readout, (2) The coordinates of the field center have been chosen so that a good coverage of the Landolt star fields is obtained with both SR and HR collimators,(3) Reference: Besselet al. 1979, UBVRI Photometry (1979 PASP...91..589B) and Landolt 1992,(4) The links provide Postscript charts of the areas with SR and HR fieldsindicated, (5) Coordinates are J2000.

PhotometricStandard Stars: 2. Gunn filters (no OBs prepared! not in Calibration Plan!)

Notes: (1)The OB are prepared with high CCD gain, four-port readout, (2) The coordinates of the field center have been chosen so that a good coverage of the Landolt star fields is obtained with both SR and HR collimators, (3) References:Thuan-Gunnsystem (1976 PASP...88..543T) and secondary standards (1994PASP..106..967J), (4) The links provide Postscript charts of the areas with SR and HR fields indicated, (5) Coordinates are J2000.

Spectroscopic Standard Stars - and Imaging Standards for Gunn & interference filters

Template name	Star name	Coordinates Ra, Dec
specphot-std-G158-100	G158-100	00:33:54.32, -12:07:57.1
specphot-std-LTT377	LTT377	00:41:46.82, -33:39:08.2
specphot-std-BPM16274	BPM16274(*)	00:50:03.18, -52:08:17.4
specphot-std-LTT1020	LTT1020	01:54:49.68, -27:28:29.7
specphot-std-EG21	EG21	03:10:30.98, -68:36:02.2
specphot-std-LTT1788	LTT1788	03:48:22.17, -39:08:33.6
specphot-std-GD50	GD50	03:48:50.06, -00:58:30.4
specphot-std-SA95-42	SA95-42	03:53:43.68, -00:04:33.0
specphot-std-HZ4	HZ4	03:55:21.70, +09:47:18.7
specphot-std-LB227	LB227	04:09:28.76, +17:07:54.4
specphot-std-HZ2	HZ2	04:12:43.51, +11:51:50.4
specphot-std-GD71	GD71	05:52:27.51, +15:53:16.6
specphot-std-LTT2415	LTT2415	05:56:24.30, -27:51:28.8
specphot-std-HD49798	HD49798(*)	06:48:04.64, -44:18:59.3
specphot-std-LTT3218	LTT3218	08:41:34.10, -32:57:00.1
specphot-std-GD108	GD108	10:00:47.33, -07:33:31.2
specphot-std-LTT3864	LTT3864	10:32:13.90, -35:37:42.4
specphot-std-LTT4364	LTT4364	11:45:37.70, -64:50:25.1
specphot-std-Feige56	Feige56	12:06:39.7, +11:40:39.0
specphot-std-HZ21	HZ21	12:13:56.42, +32:56:30.8
specphot-std-Feige66	Feige66	12:37:23.55, +25:04:00.3
specphot-std-LTT4816	LTT4816	12:38:50.94, -49:47:58.8
specphot-std-Feige67	Feige67	12:41:51.83, +17:31:20.5
specphot-std-GD153	GD153	12:57:02.37, +22:01:56.0
specphot-std-G60-54	G60-54	13:00:09.53, +03:28:55.7
specphot-std-HZ43	HZ43	13:16:22.0, +29:05:57.0
specphot-std-HZ44	HZ44	13:23:35.37, +36:07:60.0
specphot-std-CD-32d9927	CD-32d9927	14:11:46.37, -33:03:14.3
specphot-std-LTT6248	LTT6248	15:39:00.0, -28:35:33.0
specphot-std-BD33d2642	BD33d2642	15:51:59.8, +32:56:54.8
specphot-std-EG274	EG274	16:23:33.75, -39:13:47.5
specphot-std-G138-31	G138-31	16:27:53.59, +09:12:24.5
specphot-std-LTT7379	LTT7379	18:36:26.29, -44:18:33.0
specphot-std-LTT7987	LTT7987	20:10:57.38, -30:13:01.2
specphot-std-G24-9	G24-9	20:13:56.05, +06:42:55.2
specphot-std-LDS749B	LDS749B	21:32:15.75, +00:15:13.6
specphot-std-BD28d4211	BD28d4211	21:51:11.07, +28:51:51.8
specphot-std-G93-48	G93-48	21:52:25.33, +02:23:24.3
specphot-std-BD25d4655	BD25d4655	21:59:42.02, +26:25:58.1
specphot-std-NGC7293	NGC7293	22:29:38.46, -20:50:13.3
specphot-std-LTT9239	LTT9239	22:52:40.88, -20:35:26.3
specphot-std-LTT9491	LTT9491	23:19:34.98, -17:05:29.8
specphot-std-Feige110	Feige110	23:19:58.39, -05:09:55.8
specphot-std-GD248	GD248	23:26:06.69, +16:00:21.4

Notes: (*)These stars only have model data above 3200Å, (1) The OB are preparedwith high CCD gain, one-port readout, (2) The OB exist in MOS setup (three5" slitlets) and in LSS, using the largest 2.5 arcsec slit -then the OB namecontains "lss-" at the beginning, (3) The links provide detailed informationon individual stars, (4) There is also ageneraldescription as well as an RAordered list and an RA-Decskymap for standards including the above listed, (5) Coordinates areJ2000.

Empty Fields for Twilight Flats

Notes: (1)The OB are prepared with high CCD gain, four-port readout, Standard Resolution Collimator, (2) Filters defined in the OB are UBIVR for the evening dusk. For the morning the OB are named ..-RVIBU-.. instead, (4) The links call 6.8'x6.8' images from the DSS1 database, (5) Coordinates are B1950.

Highly Polarized Standard Stars for Imaging Polarimetry (IPOL). OT QUEUE: Polar Std IPOL

Readout mode: ABCD, 1x1, high. There are 4 exposures with the retarder waveplate at 0, 22.5, 45,and 67.5 deg.
Please check that the CCD is well exposed(> 10000 counts each exposure) but not saturated!You may need to adjust the exposure time.
Additional information on (some of) these stars are given on theFORS polarimetry page
Finding charts are obtained from 6.8' x 6.8' images from the DSS2 (red) database.

Highly Polarized Standard Stars for Spectropolarimetry (PMOS). OT QUEUE: Polar Std PMOS

Readout mode: A, 1x1, high, windowed 500 pixels in y.There are 4 exposures with the retarder waveplate at 0, 22.5, 45,and 67.5 deg.
Please check that the CCD is well exposed (> 10000 counts each exposure) but not saturated! You may need to adjust the exposure time.
Additional information on (some of) these stars are given on the FORS polarimetry page
Finding charts are obtained from 6.8'x6.8' images from the DSS2 (red) database.

Unpolarized Standard Stars for Imaging PolarimetryOT QUEUE: Polar Std IPOL

CCD readout mode: A, 1x1, high. There are 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg.
Please check that the CCD is well exposed (> 10000 counts each exposure) but not saturated!You may need to adjust the exposure time.
Finding charts are obtained from 6.8'x6.8' images from the DSS2 (red) database.

Unpolarized Standard Stars for SpectropolarimetryOT QUEUE: Polar Std PMOS

CCD readout mode: A, 1x1, high, window with 500 pixels in y. We have 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg.
Please check that the CCD is well exposed (> 10000 counts each exposure) but not saturated!You may need to adjust the exposure time.
Finding charts are obtained from 6.8'x6.8' images from the DSS2  (red) database