FORS1 Standard Fields and Stars

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

Photometric Standard Stars: 1. Bessell filters

Template name	Star field	Center coordinates Ra, Dec
Photom-std-SA92-high	SA92-249	00:54:35.5, +00:40:19.5
Photom-std-PG0231+051-high	PG0231+051	02:33:39.8, +05:18:37.7
Photom-std-SA95-high	SA95-105	03:53:20.0, +00:00:57.8
Photom-std-SA98-high	SA98-670	06:52:14.4, -00:19:49.9
Photom-std-Rubin149-high	Rubin149	07:24:15.3, -00:32:20.9
Photom-std-Rubin152-high	Rubin152	07:29:58.1, -02:05:45.5
Photom-std-SA100-high	SA100-269	08:53:16.1, -00:42:19.3
Photom-std-PG0942-029-high	PG0942-029	09:45:12.1, -03:08:03.2
Photom-std-SA101-high	SA101-429	09:57:35.9, -00:18:50.3
Photom-std-PG1047+003-high	PG1047+003	10:50:08.5, -00:01:04.3
Photom-std-PG1323-high	PG1323-086	13:25:52.5, -08:49:56.6
Photom-std-PG1528+062-high	PG1528+062	15:30:44.7, +06:01:04.8
Photom-std-PG1633+099-high	PG1633+099	16:35:36.0, +09:46:33.4
Photom-std-PG1657+078-high	PG1657+078	16:59:32.4, +07:42:52.0
Photom-std-SA109-high	SA109-949	17:44:15.0, -00:02:17.0
Photom-std-SA110-high	SA110-362	18:42:52.4, +00:06:28.1
Photom-std-SA111-high	SA111-2088	19:38:22.0, +00:31:01.0
Photom-std-MarkA-high	MarkA	20:43:59.5, -10:46:32.8
Photom-std-SA113-high	SA113-239	21:41:09.5, +00:23:00.0
Photom-std-PG2213-006-high	PG2213-006	22:16:23.2, -00:21:40.8
Photom-std-PG2331+055-high	PG2331+055	23:33:47.9, +05:46:16.8

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: Bessel et al. 1979, UBVRI Photometry (1979PASP...91..589B) and Landolt 1992, (4) The links provide Postscript charts of the areas with SR and HR fields indicated, (5) Coordinates are J2000.

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

Template name	Star field	Center coordinates Ra, Dec
Photom-std-Gunn-SA92	SA92-249	00:54:35.5, +00:40:19.5
Photom-std-Gunn-F762-9	F762-9	03:33:16.4, -06:05:22.1
Photom-std-Gunn-E4	E4	09:23:41.7, -45:25:22.1
Photom-std-Gunn-E5	E5	12:05:11.3, -45:34:03.0
Photom-std-Gunn-PG1633+099	PG1633+099	16:35:36.0, +09:46:33.4
Photom-std-Gunn-E7	E7	17:27:22.7, -45:01:38.0
Photom-std-Gunn-SA110	SA110-503	18:43:10.3, +00:28:58.0
Photom-std-Gunn-MarkA	MarkA	20:43:59.5, -10:46:32.8
Photom-std-Gunn-F1038-6	F1038-6	23:33:40.1, +10:07:05.4

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-Gunn system (1976PASP...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 prepared with high CCD gain, one-port readout, (2) The OB exist in MOS setup (three 5" slitlets) and in LSS, using the largest 2.5" slit -then the OB name contains "lss-" at the beginning, (3) The links provide detailed information on individual stars, (4) There is also a general description as well as an RA ordered list and an RA-Dec skymap for standards including the above listed, (5) Coordinates are J2000.

Empty Fields for Twilight Flats

Template name	Field name	Center coordinates Ra, Dec
twil-ABCD-high-UBIVR-SR-0048	SGP	00:48:30.3, -28:03:01.0
twil-ABCD-high-UBIVR-SR-0102	0102-265	01:02:48.5, -26:34:25.0
twil-ABCD-high-UBIVR-SR-0247	0248-196	02:47:46.6, -19:46:11.1
twil-ABCD-high-UBIVR-SR-0427	0427-36	04:27:26.1, -36:25:16.0
twil-ABCD-high-UBIVR-SR-0909	9090-7	09:09:32.6, -07:38:26.0
twil-ABCD-high-UBIVR-SR-1004	CT1	10:04:27.0, -02:19:00.0
twil-ABCD-high-UBIVR-SR-1102	1101-264	11:02:23.5, -26:43:56.7
twil-ABCD-high-UBIVR-SR-1226	CT5	12:26:08.7, -06:38:29.0
twil-ABCD-high-UBIVR-SR-1254	CT2	12:54:58.7, -02:07:04.0
twil-ABCD-high-UBIVR-SR-1513	SER1	15:13:13.9, -00:31:47.5
twil-ABCD-high-UBIVR-SR-1539	SPKS 04	15:39:43.0, -33:56:54.0
twil-ABCD-high-UBIVR-SR-1649	SPKS 12	16:49:42.0, -15:21:00.0
twil-ABCD-high-UBIVR-SR-1731	SPKS 08	17:31:06.0, -25:44:24.0
twil-ABCD-high-UBIVR-SR-1802	SPKS 09	18:02:01.0, -04:32:36.0
twil-ABCD-high-UBIVR-SR-1900	SPKS 10	19:00:48.0, -37:21:18.0
twil-ABCD-high-UBIVR-SR-1919	SPKS 13	19:19:09.0, +12:22:05.0
twil-ABCD-high-UBIVR-SR-2126	SPKS 14	21:26:54.4, -08:51:41.0
twil-ABCD-high-UBIVR-SR-2334	2335-40	23:34:34.6, -39:49:04.0
twil-ABCD-high-UBIVR-SR-2345	2345+007	23:45:45.9, +00:40:40.0

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.

Imaging and Spectropolarimetric Polarized Standard Stars

Template name	OB Total Execution Time (in min.)	Ra & Dec 2000	Comments
PMOS_NGC2024_5arcs IPOL_NGC2024	??	05:41:38 -01:54:37	none
PMOS_Vela1_95_5arc_high	??	09:06:00 -47:19:00	none
PMOS_Hiltner652_5arcs	??	17:43:20 -28:40:33	none
PMOS_HDE316232_5arcs IPOL_HDE316232	??	17:45:44 -29:13:18	none
PMOS_BD_14_51333_5arcs IPOL_BD_14_51333	??	18:11:58 -14:56:09	none
PMOS_BD12_5133_5arcs IPOL_BD12_5133	??	18:40:02 -12:24:07	none

The OB are prepared with high CCD gain. PMOS have 1-port readout (window with 400 pixels in y), IPOL 4-ports readout. There are 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg. The data for these stars are given on the FORS polarimetry page
 

  Unpolarized Spectropolarimetric Standard Stars

Template name	OB Total Execution Time (in min.)	Ra & Dec 2000	Comments
Zero_PMOS_HD10038	10	01:37:18.59 -40:10:38.46	Bright Am, plx=6.4 mas, no need for finding charts; slit width=1.0"
Zero_PMOS_HD13588	10	02:11:16.69 -46:35:06.16	Bright Am, plx=6.4 mas, no need for finding charts; slit width=1.0"
Zero_PMOS_HD42078	10	06:06:41.04 -42:17:55.69	Bright Am, plx=10.13, no need for finding charts; slit width=1.0"
Zero_PMOS_HD97689	10	11:13:50.74 -52:51:21.22	Bright Am, plx=12.13, no need for finding charts; slit width=1.0"
Zero_PMOS_WD1615-154	18	16:17:55.2  -15:35:51.2	White Dwarf, plx =?, high proper motion; see finding chart; slit width=2.5"
Zero_PMOS_WD1620-391	11	16:23:35.7  -39:13:21.8	White Dwarf, plx=78 mas, high proper motion; see finding chart; slit width=2.5"
Zero_PMOS_WD2039-202	18	20:42:34.7  -20:04:35.7	White Dwarf, plx=47 mas, high proper motion; see finding chart; slit width=2.5"
Zero_PMOS_WD2149+021	22	21:52:21.5  +02:23:07.2	White Dwarf, plx=40 mas, high proper motion; see finding chart; slit width=2.5"

The OB are prepared with high gain, 1-port readout (window with 500 pixels in y). We have 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg. Exposure times are set such as with 0.4 arcsec seeing we get a S/N=400 for each exposure. The coordinates are very doubtfull due to the high PM and we suggest to compare DSS1 and DSS2 to select the fastest star in the field. We'll fix this page later,... sorry!
 

 Unpolarized Imaging Polarimetric Standard Stars

Template name	OB Total Execution Time (in min.)	Ra & Dec 2000	Comments
Zero_IPOL_WD2359-434	??	00:02:10.7 -43:09:55.2	White dwarf, plx=120 mas
Zero_IPOL_WD0310-688	??	03:10:30.98 -68:36:02.2	White dwarf (EG 21), plx=120 mas
Zero_IPOL_WD0752-676	??	07:53:08.5 -67:47:33.2	White Dwarf, plx =?, high proper motion
Zero_IPOL_WD1344+106	??	13:47:24.3 +10:21:38.1	White Dwarf, plx =48, high proper motion, SE star of the binary
Zero_IPOL_WD1615-154	??	16:17:55.2 -15:35:51.2	White Dwarf, plx=60 mas, high proper motion
Zero_IPOL_WD1620-391	??	16:23:35.7 -39:13:21.8	White Dwarf, plx=78 mas, high proper motion star ~30 arcsecs SE of our coordinates?
Zero_IPOL_WD2039-202	??	20:42:34.7 -20:04:35.7	White Dwarf, plx=47 mas, high proper motion
Zero_IPOL_WD2149+021	??	21:52:21.5 +02:23:07.2	White Dwarf, plx=40 mas, high proper motion star ~1arcmin East or our coordinates?

The OB are prepared with high CCD gain, 4-ports readout. We have 4 exposures with the retarder waveplate at 0, 22.5, 45, and 67.5 deg. The links call 6.8'x6.8' images from the DSS2 database (red). The coordinates are very doubtfull due to the high PM and we suggest to compare DSS1 and DSS2 to select the fastest star in the field. We'll fix this page later,... sorry!