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J/A+A/605/A100      VVV survey Galactic Bulge Pop. II Cepheids (Bhardwaj+, 2017)

Galactic Bulge Population II Cepheids in the VVV Survey: period-luminosity relations and a distance to the Galactic center. Bhardwaj A., Rejkuba M., Minniti D., Surot F., Valenti E., Zoccali M., Gonzalez O.A., Romaniello M., Kanbur S.M., Singh H.P. <Astron. Astrophys. 605, A100 (2017)> =2017A&A...605A.100B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable Keywords: stars: variables: Cepheids - Galaxy: bulge - Galaxy: structure - galaxies: Magellanic Clouds - distance scale Abstract: We present the near-infrared observations of population II Cepheids in the Galactic bulge from VVV survey. We identify 340 population II Cepheids in the Galactic bulge from VVV survey based on their match with OGLE-III Catalogue. The single-epoch JH and multi-epoch Ks observations complement the accurate periods and optical (VI) mean-magnitudes from OGLE. The sample consisting of BL Herculis and W Virginis subtypes is used to derive period-luminosity relations after correcting mean-magnitudes for the extinction. The absolute magnitudes for population II Cepheids and RR Lyraes calibrated using Gaia and Hubble Space Telescope parallaxes, together with calibrated magnitudes for Large Magellanic Cloud population II Cepheids, are used to obtain a distance to the Galactic center. The number density for population II Cepheids is more limited as compared to abundant RR Lyraes but they are bright and exhibit a wide range in period that provides a robust period-luminosity relation for an accurate estimate of the distance to the Galactic center. Description: We present a combined OGLE-III and VVV catalogue with periods, classification, mean magnitudes and extinction for 264 Galactic bulge population II Cepheids having good-quality Ks-band light curves. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 129 264 Properties of Type II Cepheids in the Galactic bulge
See also: J/AcA/61/285 : VI light curves of Galactic Bulge Cepheids (Soszynski+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- VVV-ID VVV Source Identification 16- 24 A9 --- --- [OGLE-BLG-] 25- 33 A9 --- OGLE-ID OGLE Identification (T2CEP-NNN, OGLE BLG-T2CEP-NNN in Simbad) (1) 37- 42 F6.3 d Period Period of Type II Cepheid 46- 48 A3 --- Class Subtype of Type II Cepheid 52- 57 F6.3 mag <Vmag> ?=99.999 V-band mean magnitude 61- 66 F6.3 mag <Imag> I-band mean magnitude 70- 75 F6.3 mag <Jmag> ?=99.999 J-band mean magnitude 79- 84 F6.3 mag <Hmag> ?=99.999 H-band mean magnitude 88- 93 F6.3 mag <Ksmag> ?=99.999 Ks-band mean magnitude 98-102 F5.3 mag e_<Jmag> ?=9.999 Error in J-band mean magnitude 107-111 F5.3 mag e_<Hmag> ?=9.999 Error in H-band mean magnitude 116-120 F5.3 mag e_<Ksmag> ?=9.999 Error in Ks-band mean magnitude 125-129 F5.3 mag E(J-Ks) Color excess E(J-Ks) (2)
Note (1): The OGLE identification, Period, subtype and optical mean magnitudes of Type II Cepheids are taken from OGLE-III (Soszynski et al., 2011, Cat. J/AcA/61/285). Note (2): E(J-Ks) values are taken from extinction maps of Gonzalez et al. (2011A&A...534A...3G).
Acknowledgements: Anupam Bhardwaj, anupam.bhardwajj(at)gmail.com
(End) Anupam Bhardwaj [Univ. Delhi, India], Patricia Vannier [CDS] 27-Jul-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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