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pro vyhledávání: '"Turner, David G."'
The classical Cepheid KQ Sco is a valuable anchor for the distance scale because of its long pulsation period ($28^{\rm d}.7$) and evidence implying membership in the open cluster UBC 1558. Analyses tied to Gaia DR3 astrometry, photometry, spectrosco
Externí odkaz:
http://arxiv.org/abs/2408.03371
Autor:
Majaess, Daniel, Turner, David G.
The classical Cepheids CE Cas A, CE Cas B, CF Cas, and CG Cas are likely members of the binary open cluster comprising NGC 7790 and Berkeley 58. The clusters are of comparable age and in close proximity, as deduced from differentially dereddened $UuB
Externí odkaz:
http://arxiv.org/abs/2406.08483
Autor:
Turner, David G.
Field reddenings are summarized for 68 Cepheids from published studies and updated results presented here. The compilation forms the basis for a comparison with other published reddening scales of Cepheids, including those established from reddening-
Externí odkaz:
http://arxiv.org/abs/1603.02276
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Multi-color photometry of the stellar populations in five fields in the third Galactic quadrant centred on the clusters NGC 2215, NGC 2354, Haffner 22, Ruprecht 11, and ESO489SC01 is interpreted in terms of a warped and flared Galactic disk, without
Externí odkaz:
http://arxiv.org/abs/1511.03182
The nature of Galactic interstellar extinction is tested using reddening line parameters for several fields in conjunction with equivalent widths $W(\lambda4430)$ for the diffuse interstellar band at $4430$ \AA. The Cardelli et al.$\;$relations [29]
Externí odkaz:
http://arxiv.org/abs/1406.6073
Autor:
Turner, David G.
A new compilation of UBV data for stars near the Cepheid S Vul incorporates BV observations from APASS and NOMAD to augment UBV observations published previously. A reddening analysis yields mean colour excesses and distance moduli for two main group
Externí odkaz:
http://arxiv.org/abs/1403.1968
Autor:
Turner, David G.
The nature of our Milky Way Galaxy is reexamined from an eclectic point of view. Evidence for a central bar, for example, is not reflected in the distribution of RR Lyrae variables in the central bulge [4,5], and it is not clear if either a 2-armed o
Externí odkaz:
http://arxiv.org/abs/1310.0014
A previously-derived photometric parallax of 10.10+-0.20 mas, d=99+-2 pc, is confirmed for Polaris by a spectroscopic parallax derived using line ratios in high dispersion spectra for the Cepheid. The resulting estimates for the mean luminosity of
Externí odkaz:
http://arxiv.org/abs/1211.6103
Autor:
Majaess, Daniel J., Turner, David G., Gieren, Wolfgang P., Berdnikov, Leonid N., Lane, David J.
Classical Cepheids remain a cornerstone of the cosmic distance scale, and thus characterizing the dependence of their light amplitude on metallicity is important. Period-amplitude diagrams constructed for longer-period classical Cepheids in IC 1613,
Externí odkaz:
http://arxiv.org/abs/1211.4026