J/MNRAS/413/223 Magellanic clouds Cepheids JHKs photometry (Matsunaga+, 2011)
Period-luminosity relations of type II Cepheids in the Magellanic clouds.
Matsunaga N., Feast M.W., Soszynski I.
<Mon. Not. R. Astron. Soc., 413, 223-234 (2011)>
=2011MNRAS.413..223M 2011MNRAS.413..223M (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry, infrared
Keywords: stars: distances - stars: variables: Cepheids - Magellanic Clouds -
infrared: stars
Abstract:
Period-luminosity relations (PLRs) of type II Cepheids (T2Cs) in the
Small Magellanic Cloud (SMC) are derived based on OGLE-III,
IRSF/SIRIUS and other data, and these are compared with results for
the Large Magellanic Cloud (LMC) and Galactic globular clusters.
Evidence is found for a change of the PLR slopes from system to
system. Treating the longer period T2Cs (W Vir stars) separately gives
an SMC-LMC modulus difference of 0.39±0.05mag without any
metallicity corrections being applied. This agrees well with the
difference in moduli based on different distance indicators, in
particular the PLRs of classical Cepheids. The shorter period T2Cs (BL
Her stars) give a smaller SMC-LMC difference suggesting that their
absolute magnitudes might be affected either by metallicity or by age
effects. It is shown that the frequency distribution of T2C periods
also changes from system to system.
Description:
Soszynski et al. (2010, Cat. J/AcA/60/91), catalogued 43 T2Cs in the
SMC: 17 BLs, 10 WVs, seven pWs and nine RVs. We searched for near-IR
counterparts of these stars in the catalogue of Kato et al.
(2007PASJ...59..615K 2007PASJ...59..615K, Cat. II/288). This point-source catalogue is
based on simultaneous images in JHKs obtained with the 1.4-m Infrared
Survey Facility (IRSF) located at South African Astronomical
Observatory (SAAO), Sutherland, South Africa. The catalogue covers
40deg2 of the LMC, 11 deg2of the SMC and 4deg2 of the Magellanic
Bridge.
For comparison with the T2Cs, PLRs have been derived for the classical
Cepheids in both Clouds found in the OGLE III survey (Soszynski et al.
2008, Cat. J/AcA/58/163; Soszynski et al. 2010, Cat. J/AcA/60/17).
Choosing fundamental mode pulsators only there are 1849 stars in the
LMC and 2626 in the SMC. Of these, there are matches within 0.5arcsec,
for 1797 and 2436 stars in the IRSF catalogue (Table A1).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 41 The catalogue of OGLE-III T2Cs in the SMC
with IRSF counterparts
tablea1.dat 96 4560 The catalogue of OGLE-III classical Cepheids,
pulsating in the fundamental mode,
with IRSF counterparts
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See also:
II/288 : IRSF Magellanic Clouds Point Source Catalog (Kato+ 2007)
J/AcA/58/163 : VI light curves of LMC classical Cepheids (Soszynski+, 2008)
J/AcA/60/17 : VI light curves of SMC classical Cepheids (Soszynski+, 2010)
J/AcA/60/91 : VI light curves of SMC type II Cepheids (Soszynski+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I02 -- OGLE [1/41] OGLE ID (OGLE-III T2CNN)
4- 8 A5 --- Type Variable type
10- 16 F7.5 [d] logP Period
18- 30 A13 --- IRSF-Field IRSF counterpart
32- 40 F9.3 d MJD Observation modified Julian date
42- 46 F5.3 --- Phase Pulsation phase
48- 52 F5.2 mag Jmag IRSF J magnitude
54- 57 F4.2 mag e_Jmag rms uncertainty on Jmag
59- 63 F5.2 mag Hmag IRSF H magnitude
65- 68 F4.2 mag e_Hmag rms uncertainty on Hmag
70- 74 F5.2 mag Ksmag ?=- IRSF Ks magnitude
76- 79 F4.2 mag e_Ksmag ?=- rms uncertainty on Ksmag
81- 86 F6.3 --- dphi Shift for the phase correction (1)
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Note (1): obtained from the I-band light curves.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name OGLE name,
OGLE-LMC-CEP-NNNN or OGLE-SMC-CEP-NNNN
19- 26 F8.5 [d] logP Period
28- 40 A13 --- IRSF-Field IRSF counterpart
42- 50 F9.3 d MJD Observation modified Julian date
52- 56 F5.3 --- Phase Pulsation phase
58- 62 F5.2 mag Jmag ?=99.99 IRSF J magnitude
64- 67 F4.2 mag e_Jmag ?=9.99 rms uncertainty on Jmag
69- 73 F5.2 mag Hmag ?=99.99 IRSF H magnitude
75- 78 F4.2 mag e_Hmag ?=9.99 rms uncertainty on Hmag
80- 84 F5.2 mag Ksmag ?=99.99 IRSF Ks magnitude
86- 89 F4.2 mag e_Ksmag ?=9.99 rms uncertainty on Ksmag
91- 96 F6.3 --- dphi ?=99.990 Shift for the phase correction (1)
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Note (1): obtained from the I-band light curves.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Feb-2019