J/ApJ/864/111 HST/ACS one-year observations of M51 stars (Conroy+, 2018)
A complete census of luminous stellar variability on day to decade timescales.
Conroy C., Strader J., van Dokkum P., Dolphin A.E., Weisz D.R., Murphy J.W.,
Dotter A., Johnson B.D., Cargile P.
<Astrophys. J., 864, 111 (2018)>
=2018ApJ...864..111C 2018ApJ...864..111C
ADC_Keywords: Galaxies, nearby; Photometry, HST; Photometry, VRI;
Stars, variable
Keywords: galaxies: individual (NGC 5194) ; stars: variables: general
Abstract:
Stellar photometric variability offers a novel probe of the interior
structure and evolutionary state of stars. Here we present a census of
stellar variability on day to decade timescales across the
color-magnitude diagram (CMD) for 73000 stars brighter than MI,814=-5
in the Whirlpool Galaxy (M51). Our Cycle 24 Hubble Space Telescope
(HST) program acquired V606- and I814-band images over 34 epochs
spanning 1 year with pseudo-random cadences enabling sensitivity to
periods from days to months. We supplement these data with archival
V- and I-band HST data obtained in 1995 and 2005, providing
sensitivity to variability on decade timescales. At least 50% of stars
brighter than MI,814=-7 show strong evidence for variability within
our Cycle 24 data; among stars with V606-I814>2 the variability
fraction rises to ∼100%. Large amplitude variability (>0.3mag) on
decade timescales is restricted to red supergiants (RSGs) and very
luminous blue stars. Both populations display fairly smooth
variability on month-year timescales. The Cepheid instability strip is
clearly visible in our data, although the variability fraction within
this region never exceeds ∼10%. The location of variable stars across
the CMD broadly agrees with theoretical sources of variability,
including the instability strip, RSG pulsational instabilities,
long-period fundamental mode pulsations, and radiation-dominated
envelopes in massive stars. Our data can be used to place stringent
constraints on the precise onset of these various instabilities and
their lifetimes and growth rates.
Description:
The main data presented in this paper are our Cycle 24 observations,
collected in 34 epochs between 2016 October and 2017 September
(Proposal ID 14704, PI Conroy). The resulting cadence, shown in
Figure1, is pseudo-random with minimum/maximum separation between
visits of 4/24days. Only the HST Advanced Camera for Surveys (ACS)
data are discussed in this paper.
To enable sensitivity to variability on timescales longer than 1yr,
we supplement these new data with older HST observations. The most
important of these are the Cycle 13 data collected in 2005 January
(Proposal ID 10452, PI Beckwith) as part of the Hubble Heritage
project to obtain a six-pointing mosaic of the M51 system.
Finally, we also analyze Cycle 4 data obtained in 1995 January
(Proposal ID 5777, PI Kirshner) to follow up SN 1994I. These data were
collected with WFPC2.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 1419 72623 Catalog of stars and derived parameters
lcs.dat 62 2209854 *HST cycle 24 V- and I-band measurements
for the 72623 stars; table added by CDS
--------------------------------------------------------------------------------
Note on lcs.dat: This table is an extract from catalog.dat (ASCII version
of the original m51pcatv1.0.fits file) to list the 34 (or less)
measurements by star in single V- and I-band columns with the epochs
in MJD sent by the author.
--------------------------------------------------------------------------------
Description of file: m51pcatv1.0.fits.gz (available on the FTP) is
the original catalog in FITS format from the electronic version of the journal.
See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
J/AJ/128/1761 : HATNET variability survey (Hartman+, 2004)
J/ApJ/633/871 : Positions and photometry of HII knots in M51 (Calzetti+, 2005)
J/MNRAS/371/1405 : Variables in M33 (Hartman+, 2006)
J/AJ/134/2474 : Hα emission-line stars in 7 dwarfs gal. (Massey+, 2007)
J/ApJ/703/420 : Red supergiants in M31 (Massey+, 2009)
J/AcA/59/239 : VI LCs of LMC long-period variables (Soszynski+, 2009)
J/ApJ/752/95 : PHAT stellar cluster survey. I. Year 1 (Johnson+, 2012)
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
J/A+A/566/A43 : EPOCH Project. EROS-2 LMC periodic variables (Kim+, 2014)
J/A+A/562/A125 : OGLE-III SMC massive stars VI light curves (Kourniotis+, 2014)
J/MNRAS/442/2381 : Variable stars in M4 primary field (Nascimbeni+, 2014)
J/ApJS/215/9 : PHAT X. UV-IR photometry of M31 stars (Williams+, 2014)
J/AcA/65/297 : OGLE4 LMC and SMC Cepheids (Soszynski+, 2015)
J/ApJ/844/40 : Var. stars in M31 and M33. V. HR diagram (Humphreys+, 2017)
J/AJ/154/81 : BVRI photom. of luminous stars in M31 and M33 (Martin+, 2017)
J/ApJ/859/73 : Var. of RSGs in M31 from the iPTF survey (Soraisam+, 2018)
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg [202.44/202.55] Right ascension (J2000) (RA)
13- 22 F10.7 deg DEdeg [47.1/47.3] Declination (J2000) (DEC)
24- 30 F7.4 mag Vmag [18.7/33.6]?=99.9 HST/ACS V606 magnitude of
combined Cycle 24 data (MAGV0_C24)
32- 37 F6.4 mag e_Vmag [0.0001/8]?=9.999 Vmag error (ERRV0_C24)
39- 42 F4.2 --- chiV [0.9/4.3] V606 χ parameter of
combined Cycle 24 data (CHIV0_C24)
44- 49 F6.3 --- sharpV [-2.6/9.2]?=9.999 V606 sharpness parameter
of combined Cycle 24 data (SHARPV0_C24)
51- 55 F5.3 --- crowdV [0/3.8] V606 crowding parameter of
combined Cycle 24 data (CROWDV0_C24)
57- 62 F6.3 mag Imag [18.1/24.7] HST/ACS I814 magnitude of
combined Cycle 24 data (MAGI0_C24)
64- 69 F6.4 mag e_Imag [0.0001/0.04] Imag error (ERRI0_C24)
71- 74 F4.2 --- chiI [0.9/2] I814 χ parameter of combined
Cycle 24 data (CHII0_C24)
76- 81 F6.3 --- sharpI [-0.2/0.2] I814 sharpness parameter of
combined Cycle 24 data (SHARPI0_C24)
83- 87 F5.3 --- crowdI [0/0.5] I814 crowding parameter of combined
Cycle 24 data (CROWDI0_C24)
89- 95 F7.4 mag VmagEp1 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 1 (MAGV_C24)
97- 103 F7.4 mag VmagEp2 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 2
105- 111 F7.4 mag VmagEp3 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 3
113- 119 F7.4 mag VmagEp4 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 4
121- 127 F7.4 mag VmagEp5 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 5
129- 135 F7.4 mag VmagEp6 [18.8/36.5]?=99.9 V606 magnitude
for Cycle 24 data at Epoch 6
137- 143 F7.4 mag VmagEp7 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 7
145- 151 F7.4 mag VmagEp8 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 8
153- 159 F7.4 mag VmagEp9 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 9
161- 167 F7.4 mag VmagEp10 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 10
169- 175 F7.4 mag VmagEp11 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 11
177- 183 F7.4 mag VmagEp12 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 12
185- 191 F7.4 mag VmagEp13 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 13
193- 199 F7.4 mag VmagEp14 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 14
201- 207 F7.4 mag VmagEp15 [18.7/36]?=99.9 V606 magnitude for Cycle 24
data at Epoch 15
209- 215 F7.4 mag VmagEp16 [18.7/41.1]?=99.9 V606 magnitude for
Cycle 24 data at Epoch 16
217- 223 F7.4 mag VmagEp17 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 17
225- 231 F7.4 mag VmagEp18 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 18
233- 239 F7.4 mag VmagEp19 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 19
241- 247 F7.4 mag VmagEp20 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 20
249- 255 F7.4 mag VmagEp21 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 21
257- 263 F7.4 mag VmagEp22 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 22
265- 271 F7.4 mag VmagEp23 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 23
273- 279 F7.4 mag VmagEp24 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 24
281- 287 F7.4 mag VmagEp25 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 25
289- 295 F7.4 mag VmagEp26 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 26
297- 303 F7.4 mag VmagEp27 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 27
305- 311 F7.4 mag VmagEp28 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 28
313- 319 F7.4 mag VmagEp29 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 29
321- 327 F7.4 mag VmagEp30 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 30
329- 335 F7.4 mag VmagEp31 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 31
337- 343 F7.4 mag VmagEp32 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 32
345- 351 F7.4 mag VmagEp33 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 33
353- 359 F7.4 mag VmagEp34 ?=99.9 V606 magnitude for Cycle 24 data
at Epoch 34
361- 367 F7.4 mag e_VmagEp1 [0.001/23]?=99.9 VmagEp1 error (ERRV_C24)
369- 375 F7.4 mag e_VmagEp2 ?=99.9 VmagEp2 error ( ERRV_C24)
377- 383 F7.4 mag e_VmagEp3 ?=99.9 VmagEp3 error ( ERRV_C24)
385- 391 F7.4 mag e_VmagEp4 ?=99.9 VmagEp4 error ( ERRV_C24)
393- 399 F7.4 mag e_VmagEp5 ?=99.9 VmagEp5 error ( ERRV_C24)
401- 407 F7.4 mag e_VmagEp6 [0.001/30]?=99.9 VmagEp6 error ( ERRV_C24)
409- 415 F7.4 mag e_VmagEp7 ?=99.9 VmagEp7 error ( ERRV_C24)
417- 423 F7.4 mag e_VmagEp8 ?=99.9 VmagEp8 error ( ERRV_C24)
425- 431 F7.4 mag e_VmagEp9 ?=99.9 VmagEp9 error ( ERRV_C24)
433- 439 F7.4 mag e_VmagEp10 ?=99.9 VmagEp10 error ( ERRV_C24)
441- 447 F7.4 mag e_VmagEp11 ?=99.9 VmagEp11 error ( ERRV_C24)
449- 455 F7.4 mag e_VmagEp12 ?=99.9 VmagEp12 error ( ERRV_C24)
457- 463 F7.4 mag e_VmagEp13 ?=99.9 VmagEp13 error ( ERRV_C24)
465- 471 F7.4 mag e_VmagEp14 ?=99.9 VmagEp14 error ( ERRV_C24)
473- 479 F7.4 mag e_VmagEp15 [0.002/21]?=99.9 VmagEp15 error ( ERRV_C24)
481- 487 F7.4 mag e_VmagEp16 [0.001/29]?=99.9 VmagEp16 error ( ERRV_C24)
489- 495 F7.4 mag e_VmagEp17 ?=99.9 VmagEp17 error ( ERRV_C24)
497- 503 F7.4 mag e_VmagEp18 ?=99.9 VmagEp18 error ( ERRV_C24)
505- 511 F7.4 mag e_VmagEp19 ?=99.9 VmagEp19 error ( ERRV_C24)
513- 519 F7.4 mag e_VmagEp20 ?=99.9 VmagEp20 error ( ERRV_C24)
521- 527 F7.4 mag e_VmagEp21 ?=99.9 VmagEp21 error ( ERRV_C24)
529- 535 F7.4 mag e_VmagEp22 ?=99.9 VmagEp22 error ( ERRV_C24)
537- 543 F7.4 mag e_VmagEp23 ?=99.9 VmagEp23 error ( ERRV_C24)
545- 551 F7.4 mag e_VmagEp24 ?=99.9 VmagEp24 error ( ERRV_C24)
553- 559 F7.4 mag e_VmagEp25 ?=99.9 VmagEp25 error ( ERRV_C24)
561- 567 F7.4 mag e_VmagEp26 ?=99.9 VmagEp26 error ( ERRV_C24)
569- 575 F7.4 mag e_VmagEp27 ?=99.9 VmagEp27 error ( ERRV_C24)
577- 583 F7.4 mag e_VmagEp28 ?=99.9 VmagEp28 error ( ERRV_C24)
585- 591 F7.4 mag e_VmagEp29 ?=99.9 VmagEp29 error ( ERRV_C24)
593- 599 F7.4 mag e_VmagEp30 ?=99.9 VmagEp30 error ( ERRV_C24)
601- 607 F7.4 mag e_VmagEp31 ?=99.9 VmagEp31 error ( ERRV_C24)
609- 615 F7.4 mag e_VmagEp32 ?=99.9 VmagEp32 error ( ERRV_C24)
617- 623 F7.4 mag e_VmagEp33 ?=99.9 VmagEp33 error ( ERRV_C24)
625- 631 F7.4 mag e_VmagEp34 ?=99.9 VmagEp34 error ( ERRV_C24)
633- 639 F7.4 mag ImagEp1 [18.1/27.5]?=99.9 I814 magnitude for
cycle 24 data at epoch 1 (MAGI_C24)
641- 647 F7.4 mag ImagEp2 ?=99.9 I814 magnitude for cycle 24 data
at epoch 2
649- 655 F7.4 mag ImagEp3 ?=99.9 I814 magnitude for cycle 24 data
at epoch 3
657- 663 F7.4 mag ImagEp4 ?=99.9 I814 magnitude for cycle 24 data
at epoch 4
665- 671 F7.4 mag ImagEp5 ?=99.9 I814 magnitude for cycle 24 data
at epoch 5
673- 679 F7.4 mag ImagEp6 [18.1/26.3]?=99.9 I814 magnitude for
cycle 24 data at epoch 6
681- 687 F7.4 mag ImagEp7 ?=99.9 I814 magnitude for cycle 24 data
at epoch 7
689- 695 F7.4 mag ImagEp8 ?=99.9 I814 magnitude for cycle 24 data
at epoch 8
697- 703 F7.4 mag ImagEp9 ?=99.9 I814 magnitude for cycle 24 data
at epoch 9
705- 711 F7.4 mag ImagEp10 ?=99.9 I814 magnitude for cycle 24 data
at epoch 10
713- 719 F7.4 mag ImagEp11 ?=99.9 I814 magnitude for cycle 24 data
at epoch 11
721- 727 F7.4 mag ImagEp12 ?=99.9 I814 magnitude for cycle 24 data
at epoch 12
729- 735 F7.4 mag ImagEp13 ?=99.9 I814 magnitude for cycle 24 data
at epoch 13
737- 743 F7.4 mag ImagEp14 ?=99.9 I814 magnitude for cycle 24 data
at epoch 14
745- 751 F7.4 mag ImagEp15 [18.1/30.1]?=99.9 I814 magnitude for
cycle 24 data at epoch 15
753- 759 F7.4 mag ImagEp16 [18.1/28.4]?=99.9 I814 magnitude for
cycle 24 data at epoch 16
761- 767 F7.4 mag ImagEp17 ?=99.9 I814 magnitude for cycle 24 data
at epoch 17
769- 775 F7.4 mag ImagEp18 ?=99.9 I814 magnitude for cycle 24 data
at epoch 18
777- 783 F7.4 mag ImagEp19 ?=99.9 I814 magnitude for cycle 24 data
at epoch 19
785- 791 F7.4 mag ImagEp20 ?=99.9 I814 magnitude for cycle 24 data
at epoch 20
793- 799 F7.4 mag ImagEp21 ?=99.9 I814 magnitude for cycle 24 data
at epoch 21
801- 807 F7.4 mag ImagEp22 ?=99.9 I814 magnitude for cycle 24 data
at epoch 22
809- 815 F7.4 mag ImagEp23 ?=99.9 I814 magnitude for cycle 24 data
at epoch 23
817- 823 F7.4 mag ImagEp24 ?=99.9 I814 magnitude for cycle 24 data
at epoch 24
825- 831 F7.4 mag ImagEp25 ?=99.9 I814 magnitude for cycle 24 data
at epoch 25
833- 839 F7.4 mag ImagEp26 ?=99.9 I814 magnitude for cycle 24 data
at epoch 26
841- 847 F7.4 mag ImagEp27 ?=99.9 I814 magnitude for cycle 24 data
at epoch 27
849- 855 F7.4 mag ImagEp28 ?=99.9 I814 magnitude for cycle 24 data
at epoch 28
857- 863 F7.4 mag ImagEp29 ?=99.9 I814 magnitude for cycle 24 data
at epoch 29
865- 871 F7.4 mag ImagEp30 ?=99.9 I814 magnitude for cycle 24 data
at epoch 30
873- 879 F7.4 mag ImagEp31 ?=99.9 I814 magnitude for cycle 24 data
at epoch 31
881- 887 F7.4 mag ImagEp32 ?=99.9 I814 magnitude for cycle 24 data
at epoch 32
889- 895 F7.4 mag ImagEp33 ?=99.9 I814 magnitude for cycle 24 data
at epoch 33
897- 903 F7.4 mag ImagEp34 ?=99.9 I814 magnitude for cycle 24 data
at epoch 34
905- 911 F7.4 mag e_ImagEp1 [0.001/1]?=99.9 ImagEp1 error (ERRI_C24)
913- 919 F7.4 mag e_ImagEp2 ?=99.9 ImagEp2 error ( ERRI_C24)
921- 927 F7.4 mag e_ImagEp3 ?=99.9 ImagEp3 error ( ERRI_C24)
929- 935 F7.4 mag e_ImagEp4 ?=99.9 ImagEp4 error ( ERRI_C24)
937- 943 F7.4 mag e_ImagEp5 ?=99.9 ImagEp5 error ( ERRI_C24)
945- 951 F7.4 mag e_ImagEp6 [0.001/0.6]?=99.9 ImagEp6 error ( ERRI_C24)
953- 959 F7.4 mag e_ImagEp7 ?=99.9 ImagEp7 error ( ERRI_C24)
961- 967 F7.4 mag e_ImagEp8 ?=99.9 ImagEp8 error ( ERRI_C24)
969- 975 F7.4 mag e_ImagEp9 ?=99.9 ImagEp9 error ( ERRI_C24)
977- 983 F7.4 mag e_ImagEp10 ?=99.9 ImagEp10 error ( ERRI_C24)
985- 991 F7.4 mag e_ImagEp11 ?=99.9 ImagEp11 error ( ERRI_C24)
993- 999 F7.4 mag e_ImagEp12 ?=99.9 ImagEp12 error ( ERRI_C24)
1001-1007 F7.4 mag e_ImagEp13 ?=99.9 ImagEp13 error ( ERRI_C24)
1009-1015 F7.4 mag e_ImagEp14 ?=99.9 ImagEp14 error ( ERRI_C24)
1017-1023 F7.4 mag e_ImagEp15 [0.002/37]?=99.9 ImagEp15 error ( ERRI_C24)
1025-1031 F7.4 mag e_ImagEp16 [0.001/4]?=99.9 ImagEp16 error ( ERRI_C24)
1033-1039 F7.4 mag e_ImagEp17 ?=99.9 ImagEp17 error ( ERRI_C24)
1041-1047 F7.4 mag e_ImagEp18 ?=99.9 ImagEp18 error ( ERRI_C24)
1049-1055 F7.4 mag e_ImagEp19 ?=99.9 ImagEp19 error ( ERRI_C24)
1057-1063 F7.4 mag e_ImagEp20 ?=99.9 ImagEp20 error ( ERRI_C24)
1065-1071 F7.4 mag e_ImagEp21 ?=99.9 ImagEp21 error ( ERRI_C24)
1073-1079 F7.4 mag e_ImagEp22 ?=99.9 ImagEp22 error ( ERRI_C24)
1081-1087 F7.4 mag e_ImagEp23 ?=99.9 ImagEp23 error ( ERRI_C24)
1089-1095 F7.4 mag e_ImagEp24 ?=99.9 ImagEp24 error ( ERRI_C24)
1097-1103 F7.4 mag e_ImagEp25 ?=99.9 ImagEp25 error ( ERRI_C24)
1105-1111 F7.4 mag e_ImagEp26 ?=99.9 ImagEp26 error ( ERRI_C24)
1113-1119 F7.4 mag e_ImagEp27 ?=99.9 ImagEp27 error ( ERRI_C24)
1121-1127 F7.4 mag e_ImagEp28 ?=99.9 ImagEp28 error ( ERRI_C24)
1129-1135 F7.4 mag e_ImagEp29 ?=99.9 ImagEp29 error ( ERRI_C24)
1137-1143 F7.4 mag e_ImagEp30 ?=99.9 ImagEp30 error ( ERRI_C24)
1145-1151 F7.4 mag e_ImagEp31 ?=99.9 ImagEp31 error ( ERRI_C24)
1153-1159 F7.4 mag e_ImagEp32 ?=99.9 ImagEp32 error ( ERRI_C24)
1161-1167 F7.4 mag e_ImagEp33 ?=99.9 ImagEp33 error ( ERRI_C24)
1169-1175 F7.4 mag e_ImagEp34 ?=99.9 ImagEp34 error ( ERRI_C24)
1177-1183 F7.4 mag Vmag05 [19/39.1]?=99.9 HST V505 magnitude of
2005 data (MAG_HH)
1185-1191 F7.4 mag Imag05 [18/29]?=99.9 HST I814 magnitude of
2005 data
1193-1199 F7.4 mag e_Vmag05 [0.003/10]?=99.9 Vmag05 error (ERR_HH)
1201-1207 F7.4 mag e_Imag05 [0.001/10]?=99.9 Imag05 error ( ERR_HH)
1209-1213 F5.2 --- chiV05 [0.6/9]?=99.9 V505 χ parameter of
2005 data (CHI_HH)
1215-1219 F5.2 --- chiI05 [0.6/5]?=99.9 I814 χ parameter of
2005 data ( CHI_HH)
1221-1226 F6.3 --- sharpV05 [-10/10]?=99.9 V505 sharpness parameter
of 2005 data (SHARP_HH)
1228-1233 F6.3 --- sharpI05 [-8/6]?=99.9 I814 sharpness parameter
of 2005 data ( SHARP_HH)
1235-1240 F6.3 --- crowdV05 [0/7]?=99.9 V505 crowding parameter
of 2005 data (CROWD_HH)
1242-1247 F6.3 --- crowdI05 [0/6]?=99.9 I814 crowding parameter
of 2005 data ( CROWD_HH)
1249-1254 F6.3 mag Vmag95 [19/36]?=99.9 HST/WFPC2 V505 magnitude of
1995 data (MAG_95)
1256-1261 F6.3 mag Imag95 [18/32]?=99.9 HST/WFPC2 I814 magnitude of
1995 data
1263-1268 F6.3 mag e_Vmag95 [0.006/10]?=99.9 Vmag95 eror (ERR_95)
1270-1275 F6.3 mag e_Imag95 [0.004/10]?=99.9 Imag95 error ( ERR_95)
1277-1281 F5.2 --- chiV95 [0/18]?=99.9 V505 χ parameter of
1995 data (CHI_95)
1283-1287 F5.2 --- chiI95 [0/21]?=99.9 I814 χ parameter of
1995 data ( CHI_95)
1289-1294 F6.3 --- sharpV95 [-10/10]?=99.9 V505 sharpness parameter
of 1995 data (SHARP_95)
1296-1301 F6.3 --- sharpI95 [-10/10]?=99.9 I814 sharpness parameter
of 1995 data ( SHARP_95)
1303-1308 F6.3 --- crowdV95 [0/10]?=99.9 V505 crowding parameter
of 1995 data (CROWD_95)
1310-1315 F6.3 --- crowdI95 [0/9]?=99.9 I814 crowding parameter
of 1995 data ( CROWD_95)
1317-1325 F9.6 pix C24-Arch [0/13] Matched separation between the C24
and archival catalogs (MATCHTOHH_95)
1327-1333 F7.4 mag VmagC95 [18.9/34.2]?=99.9 Converted V606 magnitude
for 1995 data (MAG95F606W)
1335-1341 F7.4 mag VmagC05 [18.8/38]?=99.9 Converted V606 magnitude
for 2005 data (MAGHHF606W)
1343-1351 F9.6 d PerV [0/90]?=99.9 Lomb-Scargle period at maximum
power in V606 (LSPERIODV)
1353-1361 F9.6 --- PwrV [0/16.4] Lomb-Scargle maximum power in V606
(LSMAXPOWERV)
1363-1371 F9.6 d PerI [0.5/90]?=99.9 Lomb-Scargle period at
maximum power in I814 (LSPERIODI)
1373-1380 F8.5 --- PwrI [1/16.3] Lomb-Scargle maximum power in I814
(LSMAXPOWERI)
1382-1390 F9.6 --- Vrms [0.007/3]?=99.9 rms of V606 light curve
(RMS_V)
1392-1399 F8.6 --- Irms [0.008/1.5] rms of I814 light curve (RMS_I)
1401-1409 F9.6 --- VrmsN [0/73] Error-normalized rms of V606
light curve (RMSNORM_V)
1411-1419 F9.6 --- IrmsN [0.2/63] Error-normalized rms of I814
light curve (RMSNORM_I)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lcs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg [202.44/202.55] Right ascension (J2000)
13- 22 F10.7 deg DEdeg [47.1/47.3] Declination (J2000)
24- 30 F7.1 d MJD Modified Julian Date
32- 38 F7.4 mag Vmag ?=99.9 HST/ACS V606 magnitude for Cycle 24 data
40- 46 F7.4 mag e_Vmag ?=99.9 Vmag error
48- 54 F7.4 mag Imag ?=99.9 HST/ACS I814 magnitude for cycle 24 data
56- 62 F7.4 mag e_Imag ?=99.9 Imag error
--------------------------------------------------------------------------------
Acknowledgements:
Charlie Conroy [CfA; Harvard University];
for the Modified Julian Dates.
History:
From electronic version of the journal (m51pcatv1.0.fits file)
(End) Emmanuelle Perret [CDS] 19-Aug-2019