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Ultra Long Period Cepheids
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Stars/galaxy News
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0
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2153
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Title: Using Ultra Long Period Cepheids to Extend the Cosmic Distance Ladder to 100 Mpc and Beyond Authors: Jonathan C. Bird, K. Z. Stanek, Jose L. Prieto We examine the properties of 17 long period (80-180 days) and very luminous (median absolute magnitude of M_I= -7.93 and M_V= -7.03) Cepheids to s...
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Variable Stars
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Stars/galaxy News
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8
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8508
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Title: The Exciting Star of the Berkeley 59/Cepheus OB4 Complex and Other Chance Variable Star Discoveries Authors: Daniel J. Majaess, David G. Turner, David J. Lane, Kathleen E. Moncrieff A study is presented regarding the nature of several variable stars sampled during a campaign of photometr...
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Cepheid Envelopes
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Stars/galaxy News
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3
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5566
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Using ESO's Very Large Telescope Interferometer (VLTI) at Cerro Paranal, Chile, and the CHARA Interferometer at Mount Wilson, California, a team of French and North American astronomers has discovered envelopes around three Cepheids, including the [url=http://www.activeboard.com/forum...
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Cepheids
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Stars/galaxy News
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8
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10438
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Title: The Cepheid Period-Luminosity Relation (The Leavitt Law) at Mid-Infrared Wavelengths: III. Cepheids in NGC 6822 Authors: Barry F. Madore, Jane Rigby, Wendy L. Freedman, S. E. Persson, Laura Sturch, Violet Mager We present the first application of mid-infrared Period-Luminosity relat...
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Type II Cepheids
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Stars/galaxy News
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2
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2409
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Title: The Chemical Compositions of the Type II Cepheids -- The BL Her and W Vir Variables Authors: Thomas Maas (1), Sunetra Giridhar (2), David L. Lambert (1) ((1) The W.J. McDonald Observatory (2) Indian Institute of Astrophysics) Abundance analyses from high-resolution optical spectra are pr...
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Metal-rich Galactic Cepheids
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Stars/galaxy News
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0
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2159
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Title: New Baade-Wesselink distances and radii for four metal-rich Galactic Cepheids Authors: S. Pedicelli, B. Lemasle, M. Groenewegen, M. Romaniello, G. Bono, C. D. Laney, P. Francois, R. Buonanno, F. Caputo, J. Lub, J. W. Pel, F. Primas, J. Pritchard We provided accurate estimates of distance...
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Delta Cephei
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Stars/galaxy News
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256
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72551
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Minimum of Delta Cephei variable star at 3.1h, 28th May 2010 Magnitude=4.4mag Max=3.5mag Period= 5.4days RA=22h29.2m Dec=+58°25'UT
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HDE 344787
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Stars
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0
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2109
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Title: HDE 344787, the Polaris Analogue that is Even More Interesting than Polaris Authors: David G. Turner, Daniel J. Majaess, David J. Lane, J. R. Percy, D. English, Richard Huziak A collection of active photometric observations over the last half decade, archival data from the past 120 years, r...
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OGLE-LMC-CEP0227
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Stars
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3
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5499
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By discovering the first double star where a pulsating Cepheid variable and another star pass in front of one another, an international team of astronomers has solved a decades-old mystery. The rare alignment of the orbits of the two stars in the double star system has allowed a measurement of the Ce...
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Polaris system
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1 2
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Astronomy News
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13
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10241
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Astronomers using the Hubble Space Telescope have photographed the close companion to Polaris, known also as the North Star, for the first time.
"Hubble's exceptional pointing capabilities combined with the wonderful performance of its instruments allow scientists to see the...
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