Results 31 to 40 of about 1,216 (137)

Variable Blue Straggler Stars in the Open Cluster NGC 6819 Observed in the Kepler “Superstamp” Field

The Astronomical Journal, 2023
NGC 6819 is an open cluster of age 2.4 Gyr that was in the NASA Kepler spacecraft’s field of view from 2009 to 2013. The central part of the cluster was observed in a 200 × 200 pixel “superstamp” during these four years in 30 minute cadence photometry ...
Joyce A. Guzik, Andrzej S. Baran, Sachu Sanjayan, Péter Németh, Anne M. Hedlund, Jason Jackiewicz, Lori R. Dauelsberg   +6 more
doaj   +1 more source

Photometry of Variable Stars from Dome A, Antarctica [PDF]

, 2011
Dome A on the Antarctic plateau is likely one of the best observing sites on Earth thanks to the excellent atmospheric conditions present at the site during the long polar winter night.
Alcock, Baglin, Boisnard, Breger, Buchler, Carl R. Pennypacker, Daniel Luong-Van, Donald G. York, Huigen Yang, Ji Yang, John W. V. Storey, Jon S. Lawrence, Kaluzny, Kevin Krisciunas, Lasker, Lifan Wang, Lingzhi Wang, Long-Long Feng, Lucas M. Macri, Michael C. B. Ashley, Monet, Pojmanski, Qiang Liu, Riaz, Samus, Saunders, Smith, Storey, Wright, Xiangqun Cui, Xiangyan Yuan, Xu Zhou, Xuefei Gong, Zhaohui Shang, Zhenxi Zhu, Zhou, Zonghong Zhu, Zou   +37 more
core   +3 more sources

A delta Scuti distance to the Large Magellanic Cloud

, 2007
We present results from a well studied delta Scuti star discovered in the LMC. The absolute magnitude of the variable was determined from the PL relation for Galactic delta Scuti stars and from the theoretical modeling of the observed B,V,I light curves.
Alibert Y., Caldwell J. A. R., Caputo F., Cousins A. W. J., D. Harold McNamara, Gisella Clementini, Laney C. D., Marcella Marconi, Petersen J. O., Petersen J. O., Poretti E., Poretti E., Rodriguez E., Udalski A., Udalski A.   +14 more
core   +1 more source

Variable Point Sources in Sloan Digital Sky Survey Stripe 82. I. Project Description and Initial Catalog (0 h < R.A. < 4 h) [PDF]

, 2009
We report the first results of a study of variable point sources identified using multi-color time-series photometry from Sloan Digital Sky Survey (SDSS) Stripe 82 over a span of nearly 10 years (1998-2007).
Alcock, Alonso, Blake, de Lee, de Vries, Dworetsky, Eisenstein, Frieman, Gunn, Hogg, Holland C. Ford, Ivezić, Ivezić, Kowalski, Larry D. Petro, Lupton, McCullough, Michael W. Richmond, Newberg, Pojmanski, Schneider, Schwarzenberg-Czerny, Sesar, Skrutskie, Stoughton, Sullivan, Udalski, Vanden Berk, Waqas A. Bhatti, West, Yanny, York   +31 more
core   +1 more source

The Effects of Metallicity on Convective Overshoot Behavior in Models of δ Scuti Variable Stars

The Astrophysical Journal, 2022
Abstract δ Scuti variables are stars which exhibit periodic changes in their luminosity through radial and nonradial pulsations. Internally, these stars have relatively small convective cores, and convective overshoot can significantly affect the size.
V. Dornan, C. C. Lovekin
openaire   +2 more sources

Measuring mean densities of delta Scuti stars with asteroseismology. Theoretical properties of large separations using TOUCAN

, 2014
We aim at studying the theoretical properties of the regular spacings found in the oscillation spectra of delta Scuti stars. We performed a multi-variable analysis covering a wide range of stellar structure and seismic properties and model parameters ...
A. García Hernández, A. Moya, Antoci, Baglin, Breger, Breger, Breger, C. Rodrigo, Catala, Christensen-Dalsgaard, Dupret, Dziembowski, Dziembowski, E. Solano, García Hernández, García Hernández, Gilliland, Gough, Goupil, Handler, J. C. Suárez, J. R. Rodón, Jackson, Kallinger, Kjeldsen, Lebreton, Lignières, Lignières, MacGregor, Mantegazza, Matthews, Metcalfe, Morel, Morel, Moya, Moya, Moya, Moya, Moya, Paxton, Perryman, Poretti, Poretti, Poretti, R. Garrido, Reese, Reese, Reese, Reese, Soufi, Suárez, Suárez, Suárez, Suárez, Tassoul, Tingley, Uytterhoeven, Uytterhoeven, Walker, Winn, Wright, Zahn, Zwintz   +62 more
core   +1 more source

Hidden Companions Detected by Asteroseismology. II. A Long-period Noneclipsing Binary System Revealed by Kepler and TESS

The Astrophysical Journal Letters, 2023
The detection of long-period binary stars containing a δ Scuti variable is helpful to study the formation and evolution of binaries in the intermediate-mass region.
Xin Lyu, Ming Yang
doaj   +1 more source

The study of short orbital period delta Scuti pulsating variable star

, 2019
In this contribution, we pointed out the applicability of Modified binarogram in detecting low orbit Kepler binaries.
Mohammed, Yasin Abduselam, Feleke Getinet   +1 more
openaire   +1 more source

TIC 5724661: A Long-period Binary with a Pulsating sdB Star and δ Scuti Variable

The Astrophysical Journal, 2022
Abstract Using TESS 20 s cadence data, we have discovered an unusual combination of pulsating stars in what we infer to be a binary system. The binary consists of a standard δ Scuti star with pulsations over the range 32–41 day−1; this is in a likely wide orbit with a hot subdwarf-B (sdB) star, which itself has a large-amplitude p-mode ...
Rahul Jayaraman, Saul A. Rappaport, Lorne Nelson, Donald W. Kurtz, George Dufresne, Gerald Handler, Abdel Senhadji, David W. Latham, George Zhou, Allyson Bieryla, George R. Ricker   +10 more
openaire   +3 more sources

MOST discovers a multimode delta Scuti star in a triple system: HD 61199

, 2008
A field star, HD 61199 (V ~ 8), simultaneously observed with Procyon by the MOST (Microvariability & Oscillations of STars) satellite in continuous runs of 34, 17, and 34 days in 2004, 2005, and 2007, was found to pulsate in 11 frequencies in the delta ...
A. F. J. Moffat, A. Scholtz, Balona, Breger, Böhm-Vitense, D. B. Guenther, D. Huber, D. Sasselov, Daszynska-Daszkiewicz, Donati, Dziemblowski, Dziembowski, Frémat, G. A. H. Walker, Gatewood, H. Lehmann, Hadrava, Hauck, Heiter, Huber, J. F. Rowe, J. M. Matthews, Kupka, Kupka, Lenz, M. Hareter, Matthews, Matthews, Moon, Napiwotzki, O. Kochukhov, P. Lenz, Piskunov, R. Kuschnig, Reegen, Reegen, Ribas, Rowe, Ryabchikova, S. Rucinski, Schaller, Stellingwerf, V. Tsymbal, W. W. Weiss, Walker   +44 more
core   +2 more sources