* Astronomy

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...

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...

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...

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...

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...

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...

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

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...

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...

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...

	Forum	Replies	Views	Last Post
Cepheids Ultra Long Period Cepheids (Preview)	Stars/galaxy News	0	1705	Aug 1 09:19 2008 by Blobrana
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...
Cepheids Variable Variable Stars (Preview)	Stars/galaxy News	8	6106	Dec 23 17:19 2011 by Blobrana
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...
Cepheids Cepheid Envelopes (Preview)	Stars/galaxy News	3	4327	Jan 25 09:38 2011 by Blobrana
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...
Cepheids Distance Cepheids (Preview)	Stars/galaxy News	8	7079	Aug 28 06:11 2014 by Blobrana
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...
Cepheids Type II Cepheids (Preview)	Stars/galaxy News	2	1944	Jun 15 11:29 2007 by Blobrana
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...
Cepheids Metal-rich Galactic Cepheids (Preview)	Stars/galaxy News	0	1731	Mar 22 01:29 2010 by Blobrana
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...
Cepheids Delta Cephei ( 1 2 3 4 5 … 26 ) (Preview)	Stars/galaxy News	256	53090	Jun 10 15:10 2018 by Blobrana
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
Cepheids HDE 344787 (Preview)	Stars	0	1631	Feb 25 13:40 2011 by Blobrana
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...
Cepheids OGLE-LMC-CEP0227 (Preview)	Stars	3	4126	Apr 4 10:09 2013 by Blobrana
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...
Star Cepheids Polaris system ( 1 2 ) (Preview)	Astronomy News	13	8274	Feb 24 02:33 2015 by Blobrana
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...