期刊
ASTRONOMICAL JOURNAL
卷 142, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/142/6/187
关键词
astrometry; stars: distances; stars: variables: RR Lyrae
资金
- NASA from the Space Telescope Science Institute [GO-11211, GO-11789]
- NASA [NAS5-26555]
- NSF
- NASA's Astrophysics Data System Abstract Service
- STFC
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
- Deutsche Forschungsgemeinschaft (DFG) [RE1664/7-1]
- Austrian FWF [T359, P19962]
- National Research Foundation (NRF) of South Africa
- Austrian Science Fund (FWF) [T359] Funding Source: Austrian Science Fund (FWF)
- STFC [PP/D000963/1, ST/G002533/1] Funding Source: UKRI
- Austrian Science Fund (FWF) [P 19962] Funding Source: researchfish
- Science and Technology Facilities Council [ST/G002533/1, PP/D000963/1] Funding Source: researchfish
We present new absolute trigonometric parallaxes and proper motions for seven Population II variable stars-five RR Lyr variables: RZ Cep, XZ Cyg, SU Dra, RR Lyr, and UV Oct; and two type 2 Cepheids: VY Pyx and kappa Pav. We obtained these results with astrometric data from Fine Guidance Sensors, white-light interferometers on Hubble Space Telescope. We find absolute parallaxes in milliseconds of arc: RZ Cep, 2.12 +/- 0.16 mas; XZ Cyg, 1.67 +/- 0.17 mas; SU Dra, 1.42 +/- 0.16 mas; RR Lyr, 3.77 +/- 0.13 mas; UV Oct, 1.71 +/- 0.10 mas; VY Pyx, 6.44 +/- 0.23 mas; and. Pav, 5.57 +/- 0.28 mas; an average sigma(pi)/pi = 5.4%. With these parallaxes, we compute absolute magnitudes in V and K bandpasses corrected for interstellar extinction and Lutz-Kelker-Hanson bias. Using these RR Lyrae variable star absolute magnitudes, we then derive zero points for M-V-[Fe/H] and M-K-[Fe/H]-log P relations. The technique of reduced parallaxes corroborates these results. We employ our new results to determine distances and ages of several Galactic globular clusters and the distance of the Large Magellanic Cloud. The latter is close to that previously derived from Classical Cepheids uncorrected for any metallicity effect, indicating that any such effect is small. We also discuss the somewhat puzzling results obtained for our two type 2 Cepheids.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据