Results 1 to 10 of about 164 (138)

Spectroscopic Determination of Radius Changes of Cepheid Variable Stars [PDF]

Publications of the Astronomical Society of the Pacific, 2007
We introduce a simple method for determining pulsation velocities of Cepheid variables; namely, the matching of observed spectral line profiles in both shape and absolute position with model profiles. This approach avoids the ambiguous meaning of radial velocity for asymmetric lines, and it avoids the awkward projection factor (the "p" factor) used to ...
David F. Gray, Kevin B. Stevenson
openaire   +1 more source

The period-luminosity relation for Cepheid variable stars

The Astrophysical Journal, 1989
Flux-constant, hydrostatic model stellar atmospheres have been calculated using effective temperatures, gravities, and abundances appropriate for Cepheid variable stars. These models have been used to compute synthetic spectra, which have been used to compute synthetic colors and the visual surface brightness parameter S(v). The Johnson system color (V-
R. B. Hindsley, R. A. Bell
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The dynamical mass of a classical Cepheid variable star in an eclipsing binary system [PDF]

Nature, 2010
Stellar pulsation theory provides a means of determining the masses of pulsating classical Cepheid supergiants-it is the pulsation that causes their luminosity to vary. Such pulsational masses are found to be smaller than the masses derived from stellar evolution theory: this is the Cepheid mass discrepancy problem, for which a solution is missing.
Pietrzyński, G, Thompson, I. B, Gieren, W, Graczyk, D, BONO, GIUSEPPE, Udalski, A, Soszyński, I, Minniti, D, Pilecki, B.   +8 more
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Three classical Cepheid variable stars in the nuclear bulge of the Milky Way [PDF]

Nature, 2011
The nuclear bulge is a region with a radius of about 200 parsecs around the centre of the Milky Way. It contains stars with ages ranging from a few million years to over a billion years, yet its star-formation history and the triggering process for star formation remain to be resolved.
Matsunaga, N., Kawadu, T., Nishiyama, S., Nagayama, T., Kobayashi, N., Tamura, M., Bono, G., Feast, M. W., Nagata, T.   +8 more
openaire   +3 more sources

NEW VARIABLE STARS AROUND THE CEPHEID VARIABLE TU CAS

Publications of The Korean Astronomical Society, 2005
Time-series observations were carried out using a 155mm refractor and a CCD camera at Bohyunsan Optical Astronomy Observatory. We found 38 new variable stars in the region around the Cepheid variable TU Cas: 22 eclipsing binary stars, 11 Scuti type stars and an RR Lyrae star, and 4 unclassified variables.
Young-Beom Jeon, Yoon-Ho Park, Ki-Hyung Nam, Kyung-Hoon Lee   +3 more
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Cepheids and other variable stars and the distance to the Galactic Centre [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractWe review and discuss results of our survey of variable stars towards the Galactic Centre and their distances. In our near-infrared monitoring survey using IRSF/SIRIUS, we detected a number of Miras and Cepheids (both classical and type II) within 20 arcmin of the Galactic Centre.
openaire   +1 more source

The detection of a companion star to the Cepheid variable Eta Aquilae

The Astrophysical Journal, 1980
Ultraviolet spectra have been obtained with IUE of the classical Cepheid Eta Aquilae at several phases in the 7.18 day period. Significant ultraviolet emission is detected at wavelengths less than 1600 A, where little flux is expected from classical Cepheids.
J. T. Mariska, G. A. Doschek, U. Feldman
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Chemotherapy‐Induced Nausea and Vomiting in Early Breast Cancer Patients Receiving Adjuvant Chemotherapy With Fluorouracil, Epirubicin, Cyclophosphamide Followed by Docetaxel Versus an Anthracycline‐Free Regimen With Docetaxel, Cyclophosphamide—Results From a Randomized Clinical Trial

International Journal of Cancer, EarlyView.
Chemotherapy‐induced nausea and vomiting (CINV) remains a significant clinical problem despite modern antiemetics. In particular, antiemetic strategies for emerging cancer therapies lack detailed evaluation. This randomized trial analyzed hourly CINV data for patients with early breast cancer who received either docetaxel plus cyclophosphamide (TC) or ...
Manuel Hörner, Henning Schäffler, Lothar Häberle, Chloë Goossens, Kerstin Pfister, Elena Leinert, Kristina Veselinovic, Sara Y. Brucker, Uwe Köhler, Georg Heinrich, Andreas Schneeweiss, Matthias W. Beckmann, Peter A. Fasching, Wolfgang Janni, Brigitte Rack, Sabine Heublein, Philipp Ziegler   +16 more
wiley   +1 more source

Clinical Validation of Four Point‐of‐Care High‐Risk HPV Assays, Including Two Reduced‐Valency Assays, for Cervical Cancer Screening in Low‐Resource Settings

International Journal of Cancer, EarlyView.
High‐risk human papillomavirus (hrHPV) testing improves cervical cancer screening by facilitating earlier detection and prevention. In low‐resource settings, however, cost and increased referrals limit its use. At the same time, many new and more affordable assays lack validation.
Neerja Bhatla, MaryLuz Rol, Seema Singhal, Showket Hussain, Anushree Patil, Pranay Tanwar, Shalini Singh, Vikrant M. Bhor, Kiran Munne, Richa Vashishtha, Shachi Vashist, Eric Lucas, Richard Muwonge, Arianis Tatiana Ramírez, Anju Singh, Vikas Khan, Jyoti Rani, Nasera Firdausi, Sandeep Sisodiya, Rutuja Wakchaure, María Alejandra Picconi, Alejandro Calderón, Margo Bell, Annemie De Smet, Alex Vorsters, Gary M. Clifford, Madhavi Chandra, Jitendra Kumar, Partha Basu   +28 more
wiley   +1 more source

Resource‐Adapted Triage Strategies for Women Testing HPV Positive With Self‐Collected Vaginal Samples in Cameroon

International Journal of Cancer, EarlyView.
Although human papillomavirus (HPV) testing is recommended for cervical cancer screening in low‐ and middle‐income countries, optimal management of HPV‐positive women remains undetermined, particularly in resource‐limited settings. Here, using data from the 3T study involving women in Cameroon, the authors evaluated the ability of extended HPV ...
Micol Murtas, Pierre Vassilakos, Ania Wisniak, Ketty Hu, Marc Arbyn, Gilles W. Tankeu Happi, Esther Abatsong, François Marcel Ndam Nsangou, Jean‐Christophe Tille, Essia Saiji, Bruno Kenfack, Patrick Petignat   +11 more
wiley   +1 more source