J/AJ/145/106 M31 Cepheid disk sample of 1st year of PS1 (Kodric+, 2013)
Properties of M31.
II: A Cepheid disk sample derived from the first year of PS1 PAndromeda data.
Kodric M., Riffeser A., Hopp U., Seitz S., Koppenhoefer J., Bender R.,
Goessl C., Snigula J., Lee C.-H., Ngeow C.-C., Chambers K.C.,
Magnier E.A., Price P.A., Burgett W.S., Hodapp K.W., Kaiser N.,
Kudritzki R.-P.
<Astron. J. 145, 106 (2013)>
=2013AJ....145..106K 2013AJ....145..106K
ADC_Keywords: Cross identifications ; Photometry, ugriz ; Stars, variable ;
Surveys
Keywords: catalogs - distance scale - galaxies: individual (M31, NGC 224) -
galaxies: star formation - Local Group - stars: variables: Cepheids
Abstract:
We present a sample of Cepheid variable stars towards M31 based on the
first year of regular M31 observations of the PS1 survey in the r_P1
and i_P1 filters. We describe the selection procedure for Cepheid
variable stars from the overall variable source sample and develop an
automatic classification scheme using Fourier decomposition and the
location of the instability strip. We find 1440 fundamental mode
(classical δ) Cep stars, 126 Cepheids in the first overtone
mode, and 147 belonging to the Population II types. 296 Cepheids could
not be assigned to one of these classes and 354 Cepheids were found in
other surveys. These 2009 Cepheids constitute the largest Cepheid
sample in M31 known so far and the full catalog is presented in this
paper. We briefly describe the properties of our sample in its spatial
distribution throughout the M31 galaxy, in its age properties, and we
derive an apparent period-luminosity relation (PLR) in our two bands.
The Population I Cepheids nicely follow the dust pattern of the M31
disk, whereas the 147 Type II Cepheids are distributed throughout the
halo of M31. We outline the time evolution of the star formation in
the major ring found previously and find an age gradient. A comparison
of our PLR to previous results indicates a curvature term in the PLR.
Description:
Light curves and parameters for 2009 Cepheids in M31 in r_P1 and i_P1
(similar to the SDSS system) detected with the Pan-STARRS 1 1.8m
telescope in a field-of-view of 2x2° observed between 2010-07-23
and 2011-12-27 and between 2011-07-25 and 2011-08-12.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 632 2009 Cepheid parameters
crossdir.dat 95 216 *Cross identification with the DIRECT sample,
Lucas, 2004ASPC..310...33M 2004ASPC..310...33M
crossfli.dat 95 26 *Cross identification with the WeCAPP sample,
Fliri et al., 2006, Cat. J/A+A/445/423
crossvil.dat 97 225 *Cross identification with the Vilardell sample,
Vilardell et al., 2007A&A...473..847V 2007A&A...473..847V
crosscep.dat 47 2009 Light curve cross identification
lcr/* . 2009 Individual light curves in i-band
lci/* . 2009 Individual light curves in r-band
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Note on crossdir.dat, crossfli.dat, crossvil.dat:
Cepheids matched with a matching radius of 1arcsec.
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See also:
J/AJ/115/1894 : DIRECT M31A eclipsing binaries and Cepheids (Stanek+, 1998)
J/AJ/115/1016 : DIRECT M31B eclipsing binaries and Cepheids (Kaluzny+, 1998)
J/AJ/117/2810 : DIRECT M31C eclipsing binaries and Cepheids (Stanek+, 1999)
J/AJ/118/346 : DIRECT M31D eclipsing binaries and Cepheids (Kaluzny+, 1999)
J/AJ/118/2211 : DIRECT M31F eclipsing binaries and Cepheids (Mochejska+, 1999)
J/AJ/126/175 : DIRECT M31Y eclipsing binaries and Cepheids (Bonanos+, 2003)
J/A+A/445/423 : WeCAPP Survey. M31 variables (Fliri+, 2006)
J/A+A/459/321 : BV photometry of M31 eclipsing binaries (Vilardell+, 2006)
J/A+A/507/283 : Colors and extinction across the disk of M31 (Montalto+, 2009)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PSO]
5- 21 A17 --- PSO Cepheid identifier, PSO JDDD.dddd+DD.dddd
23- 30 F8.5 deg RAdeg Right ascension (J2000)
32- 39 F8.5 deg DEdeg Declination (J2000)
41- 43 I3 --- Nr [60/183] Number of epochs r-band
45- 47 I3 --- Ni [44/143] Number of epochs i-band
49- 53 F5.2 --- sigr Significance of period determination in r-band
55- 59 F5.2 --- sigi Significance of period determination in i-band
61- 66 F6.3 d Perr Period r-band
68- 73 F6.3 d Peri Period i-band
75- 81 E7.2 d e_Per Period error (1)
84- 90 F7.4 mag a-5r r-band fit parameter a-5 (2)
94- 99 F6.4 mag e_a-5r r-band fit parameter a-5 error (2)
102-108 F7.4 mag a-4r r-band fit parameter a-4 (2)
112-117 F6.4 mag e_a-4r r-band fit parameter a-4 error (2)
120-126 F7.4 mag a-3r r-band fit parameter a-3 (2)
130-135 F6.4 mag e_a-3r r-band fit parameter a-3 error (2)
138-144 F7.4 mag a-2r r-band fit parameter a-2 (2)
148-153 F6.4 mag e_a-2r r-band fit parameter a-2 error (2)
156-162 F7.4 mag a-1r r-band fit parameter a-1 (2)
166-171 F6.4 mag e_a-1r r-band fit parameter a-1 error (2)
174-180 F7.4 mag a0r r-band fit parameter a0 (2)
184-189 F6.4 mag e_a0r r-band fit parameter a0 error (2)
192-198 F7.4 mag a1r r-band fit parameter a1 (2)
202-207 F6.4 mag e_a1r r-band fit parameter a1 error (2)
210-216 F7.4 mag a2r r-band fit parameter a2 (2)
220-225 F6.4 mag e_a2r r-band fit parameter a2 error (2)
228-234 F7.4 mag a3r r-band fit parameter a3 (2)
238-243 F6.4 mag e_a3r r-band fit parameter a3 error (2)
246-252 F7.4 mag a4r r-band fit parameter a4 (2)
256-261 F6.4 mag e_a4r r-band fit parameter a4 error (2)
264-270 F7.4 mag a5r r-band fit parameter a5 (2)
274-279 F6.4 mag e_a5r r-band fit parameter a5 error (2)
282-288 F7.4 mag a-5i i-band fit parameter a-5 (2)
292-297 F6.4 mag e_a-5i i-band fit parameter a-5 error (2)
300-306 F7.4 mag a-4i i-band fit parameter a-4 (2)
310-315 F6.4 mag e_a-4i i-band fit parameter a-4 error (2)
318-324 F7.4 mag a-3i i-band fit parameter a-3 (2)
328-333 F6.4 mag e_a-3i i-band fit parameter a-3 error (2)
336-342 F7.4 mag a-2i i-band fit parameter a-2 (2)
346-351 F6.4 mag e_a-2i i-band fit parameter a-2 error (2)
354-360 F7.4 mag a-1i i-band fit parameter a-1 (2)
364-369 F6.4 mag e_a-1i i-band fit parameter a-1 error (2)
372-378 F7.4 mag a0i i-band fit parameter a0 (2)
382-387 F6.4 mag e_a0i i-band fit parameter a0 error (2)
390-396 F7.4 mag a1i i-band fit parameter a1 (2)
400-405 F6.4 mag e_a1i i-band fit parameter a1 error (2)
408-414 F7.4 mag a2i i-band fit parameter a2 (2)
418-423 F6.4 mag e_a2i i-band fit parameter a2 error (2)
426-432 F7.4 mag a3i i-band fit parameter a3 (2)
436-441 F6.4 mag e_a3i i-band fit parameter a3 error (2)
444-450 F7.4 mag a4i i-band fit parameter a4 (2)
454-459 F6.4 mag e_a4i i-band fit parameter a4 error (2)
462-468 F7.4 mag a5i i-band fit parameter a5 (2)
472-477 F6.4 mag e_a5i i-band fit parameter a5 error (2)
479-484 F6.3 --- fitQr r-band fit quality factor (3)
486-491 F6.3 --- fitQi i-band fit quality factor (3)
494-498 F5.3 mag noFacr r-band noise factor (4)
501-505 F5.3 mag noFaci i-band noise factor (4)
508-511 F4.2 --- decriser r-band decline/rise factor (5)
514-517 F4.2 --- decrisei i-band decline/rise factor (5)
519-524 F6.4 mag E(B-V) ?=0.0000 B-V color excess (6)
526-530 F5.2 mag rP1 r-band magnitude
533-536 F4.2 mag e_rP1 r-band magnitude error
538-542 F5.2 mag iP1 i-band magnitude
545-548 F4.2 mag e_iP1 i-band magnitude error
550-554 F5.2 mag r0P1 Extinction corrected r-band magnitude (7)
556-560 F5.2 mag i0P1 Extinction corrected i-band magnitude (7)
563-567 F5.2 mag WI The reddening-independent Wesenheit index
570-573 F4.2 mag e_WI Wesenheit index error
576-580 F5.3 mag A21r Amplitude ratio in the r-band (8)
583-587 F5.3 mag e_A21r Amplitude ratio error in the r-band (8)
590-594 F5.3 rad P21r Phase difference in the r-band (8)
597-601 F5.3 rad e_P21r Phase difference error in the r-band (8)
604-608 F5.3 mag A21i Amplitude ratio in the i-band (8)
611-615 F5.3 mag e_A21i Amplitude ratio error in the i-band (8)
618-622 F5.3 rad P21i Phase difference in the i-band (8)
624-629 F6.3 rad e_P21i Phase difference error in the i-band (8)
631-632 A2 --- Type Cepheid type (G1)
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Note (1): Period error determined with bootstrap method in r-band as
described in Section 3.
Note (2): Fourier series fit parameter according to Section 4.1
Note (3): According to criterion V in Section 4.5
Note (4): According to criterion VII in Section 4.5
Note (5): decline/rise factor as introduced in Section 5
Note (6): Color excess from Montalto et al., 2009, Cat. J/A+A/507/283.
For cepheids outside the Montalto et al. (J/A+A/507/283) map the
color excess value is given as 0.0000
Note (7): Extinction correction according to Section 4.2
Note (8): Fourier decomposition as described in Section 4.1
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Byte-by-byte Description of file: crossdir.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PSO]
5- 21 A17 --- PSO Cepheid identifier, PSO JDDD.dddd+DD.dddd (1)
23- 42 A20 --- DIRECT Cepheid identifier DIRECT project (2)
44- 45 A2 --- Type Cepheid type (G1)
47- 52 F6.3 d Per Period derived from r-band data
54- 59 F6.3 d PerD Period DIRECT project
61- 68 F8.5 deg RAdeg Right ascension (J2000)
70- 77 F8.5 deg RADdeg Right ascension (J2000) DIRECT project
79- 86 F8.5 deg DEdeg Declination (J2000)
88- 95 F8.5 deg DEDdeg Declination (J2000) DIRECT project
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Note (1): 18 Cepheids match more than one DIRECT Cepheid, i.e. 18 identifiers
appear more than once.
Note (2): Names as
* VNNNNN for DIRECT fields M31A-M31F, in Simbad
* JHHMMSS.s+DDMMSS.s (from DIRECT field M31Y),
<D31 JHHMMSS.s+DDMMSS.s> in Simbad.
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Byte-by-byte Description of file: crossfli.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PSO]
5- 21 A17 --- PSO Cepheid identifier, PSO JDDD.dddd+DD.dddd
23- 25 A3 --- --- [TMP]
26- 30 I5 --- WeCAPP Cepheid identifier in WeCAPP project,
(Wendelstein Calar Alto Pixellensing Project),
<[FRS2006] WeCAPP VNNNNN> in Simbad
44- 45 A2 --- Type Cepheid type (G1)
47- 52 F6.3 d Per Period derived from r-band data
54- 59 F6.3 d PerF Period WeCAPP project
61- 68 F8.5 deg RAdeg Right ascension (J2000)
70- 77 F8.5 deg RAFdeg Right ascension (J2000) WeCAPP project
79- 86 F8.5 deg DEdeg Declination (J2000)
88- 95 F8.5 deg DEFdeg Declination (J2000) WeCAPP project
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Byte-by-byte Description of file: crossvil.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PSO]
5- 21 A17 --- PSO Cepheid identifier, PSO JDDD.dddd+DD.dddd
23- 27 A5 --- --- [M31V_]
28- 44 A17 --- M31V Cepheid identifier in Vilardell sample,
(Cat. J/A+A/459/321)
46- 47 A2 --- Type Cepheid type (G1)
49- 54 F6.3 d Per Period derived from r-band data
56- 61 F6.3 d PerV Period Vilardell sample
63- 70 F8.5 deg RAdeg Right ascension (J2000)
72- 79 F8.5 deg RAVdeg Right ascension (J2000) Vilardell sample
81- 88 F8.5 deg DEdeg Declination (J2000)
90- 97 F8.5 deg DEVdeg Declination (J2000) Vilardell sample
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Byte-by-byte Description of file: crosscep.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [PSO]
5- 21 A17 --- PSO Cepheid identifier, PSO JDDD.dddd+DD.dddd
23- 34 A12 --- LCr Cepheid light curve filename for the r-band,
in subdirectory lcr
36- 47 A12 --- LCi Cepheid light curve filename for the i-band,
in subdirectory lci
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Byte-by-byte Description of file: lcr/* lci/*
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Bytes Format Units Label Explanations
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1- 9 F9.4 d JD Julian Date (JD-2450000)
11- 16 F6.3 mag mag Pan-STARRS i or r-band magnitude
18- 23 F6.3 mag e_mag Pan-STARRS i or R-BAND MAgnitude error
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Global notes:
Note (G1): Cepheid type as follows:
FM = Fundamental mode Cepheid
FO = First overtone Cepheid
T2 = Type II Cepheid
UN = Unclassifies Cepheid
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Acknowledgements:
Mihael Kodric, kodric(at)usm.lmu.de
(End) Mihael Kodric [Univ. Obs. Munich], Patricia Vannier [CDS] 18-Mar-2013