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  On the RR Lyrae Stars in Globulars. V. The Complete Near-infrared (JHK s ) Census of ω Centauri RR Lyrae Variables

Braga, V. F., Stetson, P. B., Bono, G., Dall'Ora, M., Ferraro, I., Fiorentino, G., et al. (2018). On the RR Lyrae Stars in Globulars. V. The Complete Near-infrared (JHK s ) Census of ω Centauri RR Lyrae Variables. The Astronomical Journal, 155.

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Braga, V. F.1, Author
Stetson, P. B.1, Author
Bono, G.1, Author
Dall'Ora, M.1, Author
Ferraro, I.1, Author
Fiorentino, G.1, Author
Iannicola, G.1, Author
Marconi, M.1, Author
Marengo, M.1, Author
Monson, A. J.1, Author
Neeley, J.1, Author
Persson, S. E.1, Author
Beaton, R. L.1, Author
Buonanno, R.1, Author
Calamida, A.1, Author
Castellani, M.1, Author
Di Carlo, E.1, Author
Fabrizio, M.1, Author
Freedman, W. L.1, Author
Inno, L.1, Author
Madore, B. F.1, AuthorMagurno, D.1, AuthorMarchetti, E.1, AuthorMarinoni, S.1, AuthorMarrese, P.1, AuthorMatsunaga, N.1, AuthorMinniti, D.1, AuthorMonelli, M.1, AuthorNonino, M.1, AuthorPiersimoni, A. M.1, AuthorPietrinferni, A.1, AuthorPrada-Moroni, P.1, AuthorPulone, L.1, AuthorStellingwerf, R.1, AuthorTognelli, E.1, AuthorWalker, A. R.1, AuthorValenti, E.1, AuthorZoccali, M.1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: globular clusters: individual: ω Centauri stars: distances stars: horizontal-branch stars: variables: RR Lyrae Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
 Abstract: We present a new complete near-infrared (NIR, JHK s ) census of RR Lyrae stars (RRLs) in the globular ω Cen (NGC 5139). We collected 15,472 JHK s images with 4-8 m class telescopes over 15 years (2000-2015) covering a sky area around the cluster center of 60 × 34 arcmin2. These images provided calibrated photometry for 182 out of the 198 cluster RRL candidates with 10 to 60 measurements per band. We also provide new homogeneous estimates of the photometric amplitude for 180 (J), 176 (H) and 174 (K s ) RRLs. These data were supplemented with single-epoch JK s magnitudes from VHS and with single-epoch H magnitudes from 2MASS. Using proprietary optical and NIR data together with new optical light curves (ASAS-SN) we also updated pulsation periods for 59 candidate RRLs. As a whole, we provide JHK s magnitudes for 90 RRab (fundamentals), 103 RRc (first overtones) and one RRd (mixed-mode pulsator). We found that NIR/optical photometric amplitude ratios increase when moving from first overtone to fundamental and to long- period (P > 0.7 days) fundamental RRLs. Using predicted period- luminosity-metallicity relations, we derive a true distance modulus of 13.674 ± 0.008 ± 0.038 mag (statistical error and standard deviation of the median) based on spectroscopic iron abundances, and of 13.698 ± 0.004 ± 0.048 mag based on photometric iron abundances. We also found evidence of possible systematics at the 5%-10% level in the zero-point of the period-luminosity relations based on the five calibrating RRLs whose parallaxes had been determined with the HST. This publication makes use of data gathered with the Magellan/Baade Telescope at Las Campanas Observatory, the Blanco Telescope at Cerro Tololo Inter- American Observatory, NTT at La Silla (ESO Program IDs: 64.N-0038(A), 66.D-0557(A), 68.D-0545(A), 073.D-0313(A), ID 073.D-0313(A) and 59.A-9004(D)), VISTA at Paranal (ESO Program ID: 179.A-2010) and VLT at Paranal (ESO Program ID: ID96406).

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 Dates: 2018
 Publication Status: Published in print
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Title: The Astronomical Journal
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Pages: - Volume / Issue: 155 Sequence Number: - Start / End Page: - Identifier: -