Browsing Articles by Subject "Astronomy -- Observations"

Browsing Articles by Subject "Astronomy -- Observations"

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    The connection between stellar granulation and oscillation as seen by the Kepler mission 
    Kallinger, T.; De Ridder, J.; Hekker, S.; Mathur, S.; Mosser, B.; Gruberbauer, Michael; Garcia, R. A.; Karoff, C.; Ballot, J. (EDP Sciences, 2014-10)
    Context. The long and almost continuous observations by Kepler show clear evidence of a granulation background signal in a large sample of stars, which is interpreted as the surface manifestation of convection. It has been ...

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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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    Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey 
    Willott, Chris J.; Delorme, Philippe; Omont, Alain; Bergeron, Jacqueline; Delfosse, Xavier; Forveille, Thierry; Albert, Loic; Reyle, Celine; Hill, Gary J.; Gully-Santiago, Michael; Sawicki, Marcin, 1969- (American Astronomical SocietyIOP Publishing, 2007-12)
    The Canada-France High-z Quasar Survey (CFHQS) is an optical survey designed to locate quasars during the epoch of reionization. In this paper we present the discovery of the first four CFHQS quasars at redshifts greater ...

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    Modelling the extreme X-ray spectrum of IRAS 13224-3809 
    Chiang, Chia-Ying; Walton, D. J.; Fabian, A. C.; Wilkins, D. R.; Gallo, Luigi C. (Oxford University Press, 2015-01)
    The extreme narrow-line Seyfert 1 galaxy IRAS 13224-3809 shows significant variability, frequency depended time lags, and strong Fe K line and Fe L features in the long 2011 XMM-Newton observation. In this work we study ...

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    Observations of Cepheids with the MOST satellite: contrast between pulsation modes 
    Evans, N. R.; Szabo, R.; Derekas, A.; Szabados, L.; Cameron, C.; Matthews, J. M.; Sasselov, D.; Kuschnig, R.; Rowe, J. F.; Guenther, David B. (Oxford University Press, 2015-02)
    The quantity and quality of satellite photometric data strings is revealing details in Cepheid variation at very low levels. Specifically, we observed a Cepheid pulsating in the fundamental mode and one pulsating in the ...

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    On the existence of young embedded clusters at high Galactic latitude 
    Turner, David Gerald, 1945-; Carraro, G.; Panko, E. A. (Oxford University Press, 2017-05-24)
    Careful analyses of photometric and star count data available for the nine putative young clusters identified by Camargo et al. at high Galactic latitudes reveal that none of the groups contain early-type stars, and most ...

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    Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies 
    Foschini, L.; Berton, M.; Caccianiga, A.; Ciroi, S.; Cracco, V.; Peterson, B. M.; Angelakis, E.; Braito, V.; Fuhrmann, L.; Gallo, Luigi C. (EDP Sciences, 2015-03)
    We have conducted a multiwavelength survey of 42 radio loud narrow-line Seyfert 1 galaxies (RLNLS1s), selected by searching among all the known sources of this type and omitting those with steep radio spectra. We analyse ...

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    Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies (Corrigendum) 
    Foschini, L.; Berton, M.; Caccianiga, A.; Ciroi, S.; Cracco, V.; Peterson, B. M.; Angelakis, E.; Braito, V.; Fuhrmann, L.; Gallo, Luigi C.; Grupe, D.; Järvelä, E.; Kaufmann, S.; Komossa, S.; Kovalev, Y. Y.; Lähteenmäki, A.; Lisakov, M. M.; Lister, M. L.; Mathur, S.; Richards, J. L.; Romano, P.; Sievers, A.; Tagliaferri, G.; Tammi, J.; Tibolla, O.; Tornikoski, M.; Vercellone, S.; La Mura, G.; Maraschi, L.; Rafanelli, P. (EDP Sciences, 2017-07)
    This article is an erratum for: Properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies (Astronomy & Astrophysics vol 575, A13, 2015).

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    Suzaku observations of Mrk 335: confronting partial covering and relativistic reflection 
    Gallo, Luigi C.; Wilkins, D. R.; Bonson, K.; Chiang, C.-Y.; Grupe, D.; Parker, M. L.; Zoghbi, A.; Fabian, A. C.; Komossa, S.; Longinotti, A. L. (Oxford University Press, 2015-01)
    We report on the deepest X-ray observation of the narrow-line Seyfert 1 galaxy Mrk 335 in the low-flux state obtained with Suzaku. The data are compared to a 2006 high-flux Suzaku observation when the source was ∼10 times ...

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    Using MOST to reveal the secrets of the mischievous Wolf–Rayet binary CV Ser 
    Guenther, David B.; David-Uraz, Alexandre; Moffat, Anthony F. J.; Chene, Andre-Nicolas; Rowe, Jason F.; Lange, Nicholas; Kuschnig, Rainer; Matthews, Jaymie M.; Rucinski, Slavek M.; Sasselov, Dimitar (Royal Astronomical Society, 2012)
    The Wolf–Rayet (WR) binary CV Serpentis (= WR113, WC8d + O8-9IV) has been a source of mystery since it was shown that its atmospheric eclipses change with time over decades, in addition to its sporadic dust production. The ...

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    The VMC survey – V. First results for classical Cepheids 
    Ripepi, V.; Moretti, M. I.; Marconi, M.; Clementini, G.; Cioni, M.-R. L.; Marquette, J. B.; Girardi, L.; Rubele, S.; Groenewegen, M. A. T.; de Grijs, R.; Gibson, Brad K. (Oxford University Press, 2012-08)
    The VISTA Magellanic Cloud (VMC; PI: M.-R. L. Cioni) survey is collecting deep Ks-band time series photometry of the pulsating variable stars hosted by the system formed by the two Magellanic Clouds (MCs) and ...

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    VVV DR1: the first data release of the Milky Way bulge and southern plane from the near-infrared ESO public survey VISTA variables in the Vía Láctea 
    Majaess, Daniel J.; Saito, R. K.; Hempel, M.; Minniti, D.; Lucas, P. W.; Rejkuba, M.; Toledo, I.; Gonzalez, O. A.; Alonso-Garcia, J.; Irwin, M. J. (EDP Sciences for European Southern Observatory, 2012-01)
    Context. The ESO public survey VISTA variables in the Vía Láctea (VVV) started in 2010. VVV targets 562 sq. deg in the Galactic bulge and an adjacent plane region and is expected to run for about five years. Aims. We ...

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