J/A+A/689/A162 Astro-photometry of 23 LMC clusters (Niederhofer+, 2024)
Hubble Space Telescope proper motions of Large Magellanic Cloud star clusters.
I. Catalogues and results for NGC 1850.
Niederhofer F., Bellini A., Kozhurina-Platais V., Libralato M., Haeberle M,
Kacharov N., Kamann S., Bastian N., Cabrera-Ziri I., Cioni M.-R. L.,
Dresbach F., Martocchia S., Massari D., Saracino S.
<Astron. Astrophys. 689, A162 (2024)>
=2024A&A...689A.162N 2024A&A...689A.162N (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Clusters, globular ;
Photometry, HST ; Optical ; Proper motions
Keywords: techniques: photometric - proper motions -
Hertzsprung-Russell and C-M diagrams -
stars: kinematics and dynamics - Magellanic Clouds -
galaxies: star clusters: general
Abstract:
We present proper motion (PM) measurements for a sample of 23 massive
star clusters within the Large Magellanic Cloud using multi- epoch
data from the Hubble Space Telescope (HST). We combined archival data
from the ACS/WFC and WFC3/UVIS instruments with observations from a
dedicated HST programme, resulting in time baselines between 4.7 and
18.2yr available for PM determinations. For bright well-measured
stars, we achieved nominal PM precisions of 55muas/yr down to
11muas/yr. To demonstrate the potential and limitations of our PM data
set, we analysed the cluster NGC 1850 and showcase a selection of
different science applications. The precision of the PM measurements
allows us to disentangle the kinematics of the various stellar
populations that are present in the HST field. The cluster has a
centre-of-mass motion that is different from the surrounding old field
stars and also differs from the mean motion of a close-by group of
very young stars. We determined the velocity dispersion of field stars
to be 0.128±0.003mas/yr (corresponding to 30.3±0.7km/s). The
velocity dispersion of the cluster inferred from the PM data set most
probably overestimates the true value, suggesting that the precision
of the measurements at this stage is not sufficient for a reliable
analysis of the internal kinematics of extra-galactic star clusters.
Finally, we exploit the PM-cleaned catalogue of likely cluster members
to determine any radial segregation between fast and slowly-rotating
stars, finding that the former are more centrally concentrated. With
this paper, we also release the astro-photometric catalogues for each
cluster.
Description:
The survey presents astro-photometric catalogs for 23 massive star
clusters within the Large Magellanic Cloud using multi-epoch HST
observations. For each cluster, the provided catalogue is split into
an astrometric (proper motion) file and one individual photometric
file for each combination of filter and epoch. The catalogues for a
given cluster are all sorted in the same order such that the same line
in the different catalogs corresponds to the same source.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
clusters.dat 136 23 List of studied clusters
h11_pm.dat 211 54224 Hodge 11 astrometry
h11ai1.dat 83 54224 Hodge 11 epoch 1 ACS F814W photometry
h11ar1.dat 83 54224 Hodge 11 epoch 1 ACS F606W photometry
h11wi2.dat 83 54224 Hodge 11 epoch 2 WFC3 F814W photometry
h11wu1.dat 83 54224 Hodge 11 epoch 1 WFC3 F336W photometry
n1651_pm.dat 211 13960 NGC 1651 astrometry
n1651wb1.dat 83 13960 NGC 1651 epoch 1 WFC3 F475W photometry
n1651wi1.dat 83 13960 NGC 1651 epoch 1 WFC3 F814W photometry
n1651wi2.dat 83 13960 NGC 1651 epoch 2 WFC3 F814W photometry
n1718_pm.dat 211 21008 NGC 1718 astrometry
n1718wb1.dat 83 21008 NGC 1718 epoch 1 WFC3 F475W photometry
n1718wi1.dat 83 21008 NGC 1718 epoch 1 WFC3 F814W photometry
n1718wi2.dat 83 21008 NGC 1718 epoch 2 WFC3 F814W photometry
n1783_pm.dat 211 40904 NGC 1783 astrometry
n1783ab2.dat 83 40904 NGC 1783 epoch 2 ACS F435W photometry
n1783ai1.dat 83 40904 NGC 1783 epoch 1 ACS F814W photometry
n1783ai2.dat 83 40904 NGC 1783 epoch 2 ACS F814W photometry
n1783av1.dat 83 40904 NGC 1783 epoch 1 ACS F555W photometry
n1783av2.dat 83 40904 NGC 1783 epoch 2 ACS F555W photometry
n1783wb4.dat 83 40904 NGC 1783 epoch 4 WFC3 F438W photometry
n1783wu3.dat 83 40904 NGC 1783 epoch 3 WFC3 F336W photometry
n1805_pm.dat 211 7689 NGC 1805 astrometry
n1805wh2.dat 83 7689 NGC 1805 epoch 2 WFC3 F656N photometry
n1805wi2.dat 83 7689 NGC 1805 epoch 2 WFC3 F814W photometry
n1805wi3.dat 83 7689 NGC 1805 epoch 3 WFC3 F814W photometry
n1805wu1.dat 83 7689 NGC 1805 epoch 1 WFC3 F336W photometry
n1806_pm.dat 211 33852 NGC 1806 astrometry
n1806ab2.dat 83 33852 NGC 1806 epoch 2 ACS F435W photometry
n1806ai1.dat 83 33852 NGC 1806 epoch 1 ACS F814W photometry
n1806ai2.dat 83 33852 NGC 1806 epoch 2 ACS F814W photometry
n1806av1.dat 83 33852 NGC 1806 epoch 1 ACS F555W photometry
n1806av2.dat 83 33852 NGC 1806 epoch 2 ACS F555W photometry
n1806wu3.dat 83 33852 NGC 1806 epoch 3 WFC3 F336W photometry
n1831_pm.dat 211 17979 NGC 1831 astrometry
n1831wi1.dat 83 17979 NGC 1831 epoch 1 WFC3 F814W photometry
n1831wi2.dat 83 17979 NGC 1831 epoch 2 WFC3 F814W photometry
n1831wu1.dat 83 17979 NGC 1831 epoch 1 WFC3 F336W photometry
n1841_pm.dat 211 52015 NGC 1841 astrometry
n1841ai1.dat 83 52015 NGC 1841 epoch 1 ACS F814W photometry
n1841ar1.dat 83 52015 NGC 1841 epoch 1 ACS F606W photometry
n1841wi3.dat 83 52015 NGC 1841 epoch 3 WFC3 F814W photometry
n1841wu2.dat 83 52015 NGC 1841 epoch 2 WFC3 F336W photometry
n1846_pm.dat 211 29809 NGC 1846 astrometry
n1846ab2.dat 83 29809 NGC 1846 epoch 2 ACS F435W photometry
n1846ai1.dat 83 29809 NGC 1846 epoch 1 ACS F814W photometry
n1846ai2.dat 83 29809 NGC 1846 epoch 2 ACS F814W photometry
n1846av1.dat 83 29809 NGC 1846 epoch 1 ACS F555W photometry
n1846av2.dat 83 29809 NGC 1846 epoch 2 ACS F555W photometry
n1846wu3.dat 83 29809 NGC 1846 epoch 3 WFC3 F336W photometry
n1850_pm.dat 211 62984 NGC 1850 astrometry
n1850wb1.dat 83 62984 NGC 1850 epoch 1 WFC3 F467M photometry
n1850wb3.dat 83 62984 NGC 1850 epoch 3 WFC3 F438W photometry
n1850wi2.dat 83 62984 NGC 1850 epoch 2 WFC3 F814W photometry
n1850wi3.dat 83 62984 NGC 1850 epoch 3 WFC3 F814W photometry
n1850wi4.dat 83 62984 NGC 1850 epoch 4 WFC3 F814W photometry
n1850wu3.dat 83 62984 NGC 1850 epoch 3 WFC3 F336W photometry
n1850wv2.dat 83 62984 NGC 1850 epoch 2 WFC3 F555W photometry
n1856_pm.dat 211 80910 NGC 1856 astrometry
n1856wb1.dat 83 80910 NGC 1856 epoch 1 WFC3 F438W photometry
n1856wi1.dat 83 80910 NGC 1856 epoch 1 WFC3 F814W photometry
n1856wi2.dat 83 80910 NGC 1856 epoch 2 WFC3 F814W photometry
n1856wu1.dat 83 80910 NGC 1856 epoch 1 WFC3 F336W photometry
n1856wv1.dat 83 80910 NGC 1856 epoch 1 WFC3 F555W photometry
n1866_pm.dat 211 27737 NGC 1866 astrometry
n1866wb1.dat 83 27737 NGC 1866 epoch 1 WFC3 F438W photometry
n1866wi1.dat 83 27737 NGC 1866 epoch 1 WFC3 F814W photometry
n1866wi2.dat 83 27737 NGC 1866 epoch 2 WFC3 F814W photometry
n1866wu1.dat 83 27737 NGC 1866 epoch 1 WFC3 F336W photometry
n1866wv1.dat 83 27737 NGC 1866 epoch 1 WFC3 F555W photometry
n1868_pm.dat 211 8654 NGC 1868 astrometry
n1868wi1.dat 83 8654 NGC 1868 epoch 1 WFC3 F814W photometry
n1868wi2.dat 83 8654 NGC 1868 epoch 2 WFC3 F814W photometry
n1868wu1.dat 83 8654 NGC 1868 epoch 1 WFC3 F336W photometry
n1898_pm.dat 211 50988 NGC 1898 astrometry
n1898wb1.dat 83 50988 NGC 1898 epoch 1 WFC3 F438W photometry
n1898wi1.dat 83 50988 NGC 1898 epoch 1 WFC3 F814W photometry
n1898wi2.dat 83 50988 NGC 1898 epoch 2 WFC3 F814W photometry
n1898wu1.dat 83 50988 NGC 1898 epoch 1 WFC3 F336W photometry
n1978_pm.dat 211 59722 NGC 1978 astrometry
n1978ai1.dat 83 59722 NGC 1978 epoch 1 ACS F814W photometry
n1978av1.dat 83 59722 NGC 1978 epoch 1 ACS F555W photometry
n1978wb3.dat 83 59722 NGC 1978 epoch 3 WFC3 F438W photometry
n1978wi4.dat 83 59722 NGC 1978 epoch 4 WFC3 F814W photometry
n1978wu2.dat 83 59722 NGC 1978 epoch 2 WFC3 F336W photometry
n1978wu3.dat 83 59722 NGC 1978 epoch 3 WFC3 F336W photometry
n1978wv2.dat 83 59722 NGC 1978 epoch 2 WFC3 F555W photometry
n2005_pm.dat 211 112070 NGC 2005 astrometry
n2005wb1.dat 83 112070 NGC 2005 epoch 1 WFC3 F475W photometry
n2005wi1.dat 83 112070 NGC 2005 epoch 1 WFC3 F814W photometry
n2005wi2.dat 83 112070 NGC 2005 epoch 2 WFC3 F814W photometry
n2108_pm.dat 211 34742 NGC 2108 astrometry
n2108ab2.dat 83 34742 NGC 2108 epoch 2 ACS F435W photometry
n2108ai1.dat 83 34742 NGC 2108 epoch 1 ACS F814W photometry
n2108ai2.dat 83 34742 NGC 2108 epoch 2 ACS F814W photometry
n2108av1.dat 83 34742 NGC 2108 epoch 1 ACS F555W photometry
n2108av2.dat 83 34742 NGC 2108 epoch 2 ACS F555W photometry
n2108wi3.dat 83 34742 NGC 2108 epoch 3 WFC3 F814W photometry
n2173_pm.dat 211 12602 NGC 2173 astrometry
n2173wb1.dat 83 12602 NGC 2173 epoch 1 WFC3 F475W photometry
n2173wi1.dat 83 12602 NGC 2173 epoch 1 WFC3 F814W photometry
n2173wi2.dat 83 12602 NGC 2173 epoch 2 WFC3 F814W photometry
n2173wu1.dat 83 12602 NGC 2173 epoch 1 WFC3 F336W photometry
n2203_pm.dat 211 12783 NGC 2203 astrometry
n2203wb1.dat 83 12783 NGC 2203 WFC3 epoch 1 F475W photometry
n2203wi1.dat 83 12783 NGC 2203 WFC3 epoch 1 F814W photometry
n2203wi2.dat 83 12783 NGC 2203 WFC3 epoch 2 F814W photometry
n2203wu1.dat 83 12783 NGC 2203 WFC3 epoch 1 F336W photometry
n2209_pm.dat 211 6856 NGC 2209 astrometry
n2209wb1.dat 83 6856 NGC 2209 epoch 1 WFC3 F438W photometry
n2209wi1.dat 83 6856 NGC 2209 epoch 1 WFC3 F814W photometry
n2209wi2.dat 83 6856 NGC 2209 epoch 2 WFC3 F814W photometry
n2210_pm.dat 211 63217 NGC 2210 astrometry
n2210ai1.dat 83 63217 NGC 2210 epoch 1 ACS F814W photometry
n2210ar1.dat 83 63217 NGC 2210 epoch 1 ACS F606W photometry
n2210wi2.dat 83 63217 NGC 2210 epoch 2 WFC3 F814W photometry
n2210wu1.dat 83 63217 NGC 2210 epoch 1 WFC3 F336W photometry
n2213_pm.dat 211 9791 NGC 2213 astrometry
n2213wb1.dat 83 9791 NGC 2213 epoch 1 WFC3 F475W photometry
n2213wi1.dat 83 9791 NGC 2213 epoch 1 WFC3 F814W photometry
n2213wi2.dat 83 9791 NGC 2213 epoch 2 WFC3 F814W photometry
n2257_pm.dat 211 39611 NGC 2257 astrometry
n2257ai1.dat 83 39611 NGC 2257 epoch 1 ACS F814W photometry
n2257ar1.dat 83 39611 NGC 2257 epoch 1 ACS F606W photometry
n2257wi2.dat 83 39611 NGC 2257 epoch 2 WFC3 F814W photometry
n2257wu1.dat 83 39611 NGC 2257 epoch 1 WFC3 F336W photometry
--------------------------------------------------------------------------------
Byte-by-byte Description of file: clusters.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Cluster Cluster name
10- 11 I2 h RAh Simbad right ascension (J2000)
13- 14 I2 min RAm Simbad right ascension (J2000)
16- 20 F5.2 s RAs Simbad right ascension (J2000)
22 A1 --- DE- Simbad declination sign (J2000)
23- 24 I2 deg DEd Simbad declination (J2000)
26- 27 I2 arcmin DEm Simbad declination (J2000)
29- 32 F4.1 arcsec DEs Simbad declination (J2000)
34- 45 A12 --- FileName1 Name of table with pm data
47- 58 A12 --- FileName2 Name of table with photometric data
60- 71 A12 --- FileName3 Name of table with photometric data
73- 84 A12 --- FileName4 Name of table with photometric data
86- 97 A12 --- FileName5 Name of table with photometric data
99-110 A12 --- FileName6 Name of table with photometric data
112-123 A12 --- FileName7 Name of table with photometric data
125-136 A12 --- FileName8 Name of table with photometric data
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *_pm.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
3- 13 F11.8 deg RAdeg Right ascension (ICRS) at 2016.0
16- 27 F12.8 deg DEdeg Declination (ICRS) at 2016.0
30- 39 F10.4 pix X X master-frame position
42- 51 F10.4 pix Y Y master-frame position
56- 63 F8.4 mas/yr pmRAc Corrected RA*cos(Dec) proper motion
69- 75 F7.4 mas/yr e_pmRAc Error on corrected RA*cos(Dec) proper motion
80- 87 F8.4 mas/yr pmDEc Corrected Dec proper motion
93- 99 F7.4 mas/yr e_pmDEc Error on corrected Dec proper motion
104-111 F8.4 --- chi2rx Reduced chi2 of RA*cos(Dec) proper-motion fit
116-123 F8.4 --- chi2ry Reduced chi2 of Dec proper-motion fit
129-130 I2 --- Nf Initial number of images for proper-motion fit
136-137 I2 --- Nu Final number of images for proper-motion fit
141-148 F8.5 yr Time Time baseline for the proper-motion fit
153-160 F8.4 mas/yr pmRAr Raw RA*cos(Dec) proper motion
166-172 F7.4 mas/yr e_pmRAr Error on raw RA cos(Dec) proper motion
177-184 F8.4 mas/yr pmDEr Raw Dec proper motion
190-196 F7.4 mas/yr e_pmDEr Error on raw Dec proper motion
202 I1 --- cflag [0/1] Correction flag
206-211 I6 --- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *ab2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F435W ?=0 Calibrated HST/ACS F435W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *av[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F555W ?=0 Calibrated HST/ACS F555W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *ar1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F606W ?=0 Calibrated HST/ACS F606W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *ai[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F814W ?=0 Calibrated HST/ACS F814W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *wu[123].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F336W ?=0 Calibrated HST/WFC3 F336W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: n1783wb4* n1[89]?[68]wb?.* n1850wb3* n2209wb1*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F438W ?=0 Calibrated HST/WFC3 F438W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: n1850wb1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F467M ?=0 Calibrated HST/WFC3 F467M magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: n1[67]*wb1.dat n2[01]*wb1.dat n22?3wb1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F475W ?=0 Calibrated HST/WFC3 F475W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *wv[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F555W ?=0 Calibrated HST/WFC3 F555W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: n1805wh2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F656N ?=0 Calibrated HST/WFC3 F656N magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *wi[1234].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 11 F7.4 mag F814W ?=0 Calibrated HST/WFC3 F814W magnitude (Vega)
17- 22 F6.4 -- rms ?=0 Photometric rms
29- 34 F6.4 -- qfit ?=0 Quality-of-PSF-fit (QFIT) parameter
39- 46 F8.4 -- radxs ?=0 Radial excess parameter
49- 59 F11.5 -- o ?=0 Proximity parameter
63- 64 I2 -- Nf ?=0 Number of exposures a source was found in
68- 69 I2 -- Nu ?=0 Number of exposures used to measure flux
74 I1 -- sat ?=0 Saturation flag
78- 83 I6 -- Id ID number of the source within the cluster
--------------------------------------------------------------------------------
Acknowledgements:
Florian Niederhofer, fniederhofer(at)aip.de
(End) Patricia Vannier [CDS] 24-Jun-2024