| PRUDIL, Zdeněk, István DÉKÁNY, Márcio CATELAN, Radoslaw SMOLEC, Eva GREBEL a Marek SKARKA. On the Oosterhoff dichotomy in the Galactic bulge: I. Spatial distribution. Monthly Notices of the Royal Astronomical Society. Oxford: OXFORD UNIV PRESS, 2019, roč. 484, č. 4, s. 4833-4848. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stz311. |
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@article{1512956,
author = {Prudil, Zdeněk and Dékány, István and Catelan, Márcio and Smolec, Radoslaw and Grebel, Eva and Skarka, Marek},
article_location = {Oxford},
article_number = {4},
doi = {http://dx.doi.org/10.1093/mnras/stz311},
keywords = {Galaxy: bulge; stars: variables: RR Lyrae; stars: variables: horizontalbranch},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {On the Oosterhoff dichotomy in the Galactic bulge: I. Spatial distribution},
url = {https://arxiv.org/pdf/1901.09726.pdf},
volume = {484},
year = {2019}
}
TY - JOUR
ID - 1512956
AU - Prudil, Zdeněk - Dékány, István - Catelan, Márcio - Smolec, Radoslaw - Grebel, Eva - Skarka, Marek
PY - 2019
TI - On the Oosterhoff dichotomy in the Galactic bulge: I. Spatial distribution
JF - Monthly Notices of the Royal Astronomical Society
VL - 484
IS - 4
SP - 4833-4848
EP - 4833-4848
PB - OXFORD UNIV PRESS
SN - 00358711
KW - Galaxy: bulge
KW - stars: variables: RR Lyrae
KW - stars: variables: horizontalbranch
UR - https://arxiv.org/pdf/1901.09726.pdf
L2 - https://arxiv.org/pdf/1901.09726.pdf
N2 - We present a study of the Oosterhoff (Oo) dichotomy in the Galactic bulge using 8 141 fundamental mode RR Lyrae stars. We used public photometric data from the Optical Gravitational Lensing Experiment (OGLE) and the Vista Variables in the VVV survey (VVV). We carefully selected fundamental mode stars without modulation and without association with any globular cluster located towards the Galactic bulge. Subsequently, we identified and separated the Oosterhoff groups I and II on the basis of their period-amplitude distribution and using a relation fitted to the Oosterhoff I locus. Both Oosterhoff groups were then compared to observations of two bulge globular clusters and with models of stellar pulsation and evolution. We found that some of the variables classified as Oo II belong to a third Oo group. The Oosterhoff II variables are more metal-poor on average, more massive, and cooler than their Oosterhoff I counterparts. The analysis of their spatial distribution shows a systematic difference between foreground, central and background regions in the occurrence of the Oosterhoff II group. The difference between the Oo I and II groups is also seen in their distance distributions with respect to the Galactic bar, but neither group is associated with the bar.
ER -
PRUDIL, Zdeněk, István DÉKÁNY, Márcio CATELAN, Radoslaw SMOLEC, Eva GREBEL a Marek SKARKA. On the Oosterhoff dichotomy in the Galactic bulge: I. Spatial distribution. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: OXFORD UNIV PRESS, 2019, roč.~484, č.~4, s.~4833-4848. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stz311.
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