Results 101 to 110 of about 5,915 (202)

The MACHO Project LMC Variable Star Inventory: XII. Three Cepheid Variables in Eclipsing Binaries

, 2002
We present a method for solving the lightcurve of an eclipsing binary system which contains a Cepheid variable as one of its components as well as the solutions for three eclipsing Cepheids in the Large Magellanic Cloud (LMC). A geometric model is constructed in which the component stars are assumed to be spherical and on circular orbits.
Alcock, C., Allsman, R. A., Alves, D. R., Becker, A. C., Bennett, D. P., Cook, K. H., Drake, A. J., Freeman, K. C., Griest, K., Hawley, S. L., Keller, S., Lehner, M. J., Lepischak, D., Marshall, S. L., Minniti, D., Nelson, C. A., Peterson, B. A., Popowski, P., Pratt, M. R., Quinn, P. J., Rodgers, A. W., Suntzeff, N., Sutherland, W., Vandehei, T., Welch, D. L.   +24 more
openaire   +2 more sources

Mining Sky Surveys for Astrophysically Interesting Variable Stars: The Cepheid Period Range

AIP Conference Proceedings, 2009
We have undertaken a project to discover new type II Cepheids in two large‐area sky surveys. However, most of the candidates from the surveys differ from type II Cepheids in their amplitude and period distributions and they form a separate, cooler sequence relative to the Cepheids in a temperature—gravity plot.
Edward G. Schmidt, Joyce Ann Guzik, Paul A. Bradley   +2 more
openaire   +2 more sources

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

OGLE-IV Period–Luminosity Relation of the LMC: An Analysis Using Mean and Median Magnitudes

The Astronomical Journal
The Period–Luminosity (PL) relation for Cepheid variable stars in the LMC is crucial for distance measurements in astronomy. This study analyzes the impact of using the median rather than the mean of the PL relation’s slope and zero-point.
Jaime Muñoz, Alejandro García-Varela, Santiago Henao-Castellanos, Beatriz Sabogal, Luis Felipe Giraldo, Jorge Martínez   +5 more
doaj   +1 more source

Converging on the Cepheid Metallicity Dependence: Implications of Nonstandard Gaia Parallax Recalibration on Distance Measures

The Astrophysical Journal
By comparing Cepheid brightnesses with geometric distance measures including Gaia EDR3 parallaxes, most recent analyses conclude metal-rich Cepheids are brighter, quantified as γ ∼ −0.2 mag dex ^−1 .
Louise Breuval, Gagandeep S. Anand, Richard I. Anderson, Rachael Beaton, Anupam Bhardwaj, Stefano Casertano, Gisella Clementini, Mauricio Cruz Reyes, Giulia De Somma, Martin A. T. Groenewegen, Caroline D. Huang, Pierre Kervella, Saniya Khan, Lucas M. Macri, Marcella Marconi, Javier H. Minniti, Adam G. Riess, Vincenzo Ripepi, Martino Romaniello, Daniel Scolnic, Erasmo Trentin, Piotr Wielgórski, Wenlong Yuan   +22 more
doaj   +1 more source

The Cepheid Distance Scale: A Novel Method for Obtaining Mean Magnitudes from Single-epoch Observations

The Astronomical Journal
We present a novel technique for mapping single-phase observations of Cepheids in any given band into their time-averaged values, using strong priors on the known interrelations of the multiwavelength widths of Cepheid period–luminosity (PL) relations ...
Barry F. Madore, Wendy L. Freedman, Kayla Owens   +2 more
doaj   +1 more source

IS POLARIS LEAVING THE CEPHEID INSTABILITY STRIP?

Odessa Astronomical Publications, 2017
Although Polaris is generally regarded as an overtone pulsator that may soon switch to pulsation in the fundamental mode, it is argued that the variable is actually crossing the instability strip for the first time and is in the process of leaving the ...
D. G. Turner
doaj   +1 more source

The MACHO Project LMC Variable Star Inventory: Classical Cepheids, AGB Variables, and the 9 Million Star Color-Magnitude Diagram

, 1998
This paper has been ...
Alves, D. R., Basu, A., Cook, K. H., Welch, D. L., Alcock, C., Marshall, S., Axelrod, T., Drake, A., Freeman, K., Peterson, B., Allsman, R., Becker, A., Tomaney, A., Griest, K., Vandehei, T., Lehner, M., Bennett, D., Minniti, D., Pratt, M., Sutherland, W., Quinn, P.   +20 more
openaire   +2 more sources

Stellar Variability and Distance Indicators in the Near-infrared in Nearby Galaxies. II. Pulsating Stars in the Carina Dwarf Spheroidal

The Astronomical Journal
We present homogeneous, near-infrared ( JHK _s bands) time-series observations of the classical Carina dwarf spheroidal (dSph) galaxy to determine accurate and precise distances using the pulsating stars as standard candles.
Chow-Choong Ngeow, Anupam Bhardwaj, Prashant Nishad, Susmita Das   +3 more
doaj   +1 more source

Type II Cepheids: period-luminosity-metallicity relations for the Population II distance scale

Frontiers in Astronomy and Space Sciences
Type II Cepheids are a class of pulsating variable stars that play a critical role in our understanding of stellar evolution, distance measurement and tracing the structure and kinematics of old stars in nearby galaxies.
Susmita Das, Susmita Das, Susmita Das, Anupam Bhardwaj, Marcella Marconi   +4 more
doaj   +1 more source