Browsing by Author "Gieren, W."

Browsing by Author "Gieren, W."

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    Anchoring the distance scale via X-ray/infrared data for Cepheid clusters: SU Cas 
    Gallo, Luigi C.; Turner, David Gerald, 1945-; Majaess, Daniel J.; Lane, D. J.; Gieren, W.; Bonatto, C.; Balam, D.; Berdnikov, L. (American Astronomical SocietyIOP Publishing, 2012-07-10)
    New X-ray (XMM-Newton) and JHK[subscript s] (Observatoire du Mont-Megantic) observations for members of the star cluster Alessi 95, which Turner et al. discovered hosts the classical Cepheid SU Cas, were used in tandem ...

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    A cluster of class I/f/II young stellar objects discovered near the Cepheid SU Cas 
    Majaess, Daniel J.; Turner, David Gerald, 1945-; Gieren, W. (Oxford Academic, 2012-04)
    Preliminary constraints are placed on a cluster of young stellar objects (J2000 02:54:31.4 +69:20:32.5) discovered in the field of the classical Cepheid SU Cas. The Wide-field Infrared Survey Explorer (WISE) 3.4-, 4.6-, ...

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    Concerning the classical Cepheid VI[subscript C] Wesenheit function's strong metallicity dependence 
    Majaess, Daniel J.; Turner, David Gerald, 1945-; Gieren, W. (IOP Publishing, 2011-11-10)
    Evidence is presented which supports findings that the classical Cepheid VIC period Wesenheit function is relatively insensitive to metallicity. The viability of a recently advocated strong metallicity dependence ...

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    Constraining dust extinction properties via the VVV survey 
    Majaess, Daniel J.; Turner, David Gerald, 1945-; Dékány, I.; Minniti, D.; Gieren, W. (EDP Sciences, 2016-10)
    Near-infrared color-excess and extinction ratios are essential for establishing the cosmic distance scale and probing the Galaxy, particularly when analyzing targets attenuated by significant dust. A robust determination ...

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    Discovery of a pair of classical Cepheids in an invisible cluster beyond the Galactic bulge 
    Majaess, Daniel J.; Dekany, I.; Minniti, D.; Hajdu, G.; Alonso-Garcia, J.; Hempel, M.; Palma, T.; Catelan, M.; Gieren, W. (American Astronomical Society, 2015-01-20)
    We report the discovery of a pair of extremely reddened classical Cepheid variable stars located in the Galactic plane behind the bulge, using near-infrared (NIR) time-series photometry from the VISTA Variables in the Vía ...

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    Discovery of the host cluster for the fundamental Cepheid calibrator Zeta Geminorum 
    Majaess, Daniel J.; Turner, David Gerald, 1945-; Gieren, W.; Balam, D.; Lane, D. J. (IOP Publishing Limited, 2012-03-20)
    New and existing CORAVEL, UBVJHKs, HST, HIP/Tycho, ARO, KPNO, and DAO observations imply that the fundamental Cepheid calibrator ζ Gem is a cluster member. The following parameters were inferred for ζ ...

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    Evidence for photometric contamination in key observations of Cepheids in the benchmark galaxy IC 1613 
    Majaess, Daniel J.; Turner, David Gerald, 1945-; Gieren, W.; Ngeow, C. (EDP Sciences, 2014-12)
    This study helps increase awareness of the pernicious effects of photometric contamination (crowding/blending), since it can propagate an undesirable systematic offset into the cosmic distance scale. The latest Galactic ...

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    New evidence supporting cluster membership for the keystone calibrator Delta Cephei 
    Majaess, Daniel J.; Turner, David Gerald, 1945-; Gieren, W. (IOP Publishing Limited, 2012-03-10)
    New and existing UBVJHKs, spectroscopic, NOMAD, Hubble Space Telescope, and revised Hipparcos observations are employed to determine properties for δ Cep and its host star cluster. The multi-faceted approach ...

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    On the form of the Spitzer Leavitt Law and its dependence on metallicity 
    Majaess, Daniel J.; Turner, David Gerald, 1945-; Gieren, W. (American Astronomical Society, 2013-08-01)
    The form and metallicity dependence of Spitzer mid-infrared Cepheid relations are a source of debate. Consequently, Spitzer 3.6 and 4.5 [mu]m period–magnitude and period–color diagrams were re-examined via robust routines, ...

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    Strengthening the open cluster distance scale via VVV photometry 
    Majaess, Daniel J.; Turner, David Gerald, 1945-; Bidin, C. Moni; Geisler, D.; Borissova, J.; Minniti, D.; Bonatto, C.; Gieren, W.; Carraro, G.; Kurtev, R. (EDP Sciences, 2012-01)
    Approximately 14% of known Galactic open clusters possess absolute errors ≤20% as evaluated from n ≥ 3 independent distance estimates, and the statistics for age estimates are markedly worse. That impedes such diverse ...

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    The VVV Survey reveals classical Cepheids tracing a young and thin stellar disk across the Galaxy's bulge 
    Dekany, I.; Minniti, D.; Majaess, Daniel J.; Zoccali, M.; Hajdu, G.; Alonso-Garcia, J.; Catelan, M.; Gieren, W.; Borissova, J. (American Astronomical Society, 2015-10-20)
    Solid insight into the physics of the inner Milky Way is key to understanding our Galaxy’s evolution, but extreme dust obscuration has historically hindered efforts to map the area along the Galactic mid-plane. New ...