Results 61 to 70 of about 267 (119)

Color–Magnitude Diagram of NGC 205 and Its RR Lyrae Variables

The Astronomical Journal
We present the deepest color–magnitude diagram (CMD) for NGC 205 in the F606W (≈ V ) and F814W (≈ I ) filters. Our archival Hubble Space Telescope/Advanced Camera for Surveys field is centered ∼3 $\mathop{.}\limits^{{\rm{^{\prime} }}}$ 8 northwest of the
Ata Sarajedini
doaj   +1 more source

CHEMICAL INHOMOGENEITY IN RED GIANT BRANCH STARS AND RR LYRAE VARIABLES IN NGC 1851: TWO SUBPOPULATIONS IN RED GIANT BRANCH [PDF]

, 2009
Jae-Woo Lee, Jina Lee, Young-Woon Kang, Young‐Wook Lee, Sang-Il Han, Seok‐Joo Joo, Soo‐Chang Rey, David Yong   +7 more
openalex   +1 more source

The Evolutionary Status of M3 RR Lyrae Variable Stars: Breakdown of the Canonical Framework? [PDF]

, 2004
M. Catelan
openalex   +1 more source

The Lack of RR Lyrae Variables in Ultrafaint Dwarf Galaxy Sextans II

The Astronomical Journal
RR Lyrae in ultrafaint dwarf (UFD) galaxies, if found, would be valuable to constrain the distances of these UFD. In this work, we report our search of RR Lyrae in a recently discovered UFD—Sextans II. Based on multiband (griz) time-series archival DECam
Chow-Choong Ngeow, Anupam Bhardwaj
doaj   +1 more source

RR Lyrae Variables in the Globular Cluster M55. The First Evidence for Nonradial Pulsations in RR Lyr Stars [PDF]

, 2000
A. Olech, J. Kałużny, I. B. Thompson, W. Pych, W. Krzemiński, A. Schwarzenberg‐Czerny   +5 more
openalex   +1 more source

Variable stars in the Gaia era: Mira, RR Lyrae, δ and Type-II Cepheids [PDF]

, 2017
Martin A T Groenewegen, Martin A T Groenewegen   +1 more
openalex   +1 more source

First Detection of Shock Waves in RRc Stars

The Astrophysical Journal
Although shock waves have been well documented in fundamental-mode RRab stars, their existence in first-overtone pulsator stars, RRc stars, has remained uncertain. Building upon the spectroscopic frameworks established by M. Chadid et al., we present the
Junzhang Li, Merieme Chadid
doaj   +1 more source

Population II Distance Indicators: RR Lyrae Variables, Tip of the Red Giant Branch (TRGB) Stars and J-Branch Asymptotic Giant Branch (JAGB/Carbon) Stars [PDF]

, 2023
Barry F. Madore, Wendy L. Freedman
openalex   +1 more source

Long-term investigation of an open cluster Berkeley 65

Frontiers in Astronomy and Space Sciences
We present a decade-long investigation of a poorly studied cluster, Berkeley 65 (Be 65), using deep optical data from the telescopes of ARIES, Nainital Observatory.
Tarak Chand, Tarak Chand, Saurabh Sharma, Koshvendra Singh, Jeewan Pandey, Aayushi Verma, Aayushi Verma, Harmeen Kaur, Mamta, Mamta, Manojit Chakraborty, Manojit Chakraborty, Devendra K. Ojha, Ajay Kumar Singh   +13 more
doaj   +1 more source

The MACHO Project Large Magellanic Cloud Variable Star Inventory. III. Multimode RR Lyrae Stars, Distance to the Large Magellanic Cloud, and Age of the Oldest Stars [PDF]

, 1997
C. Alcock, R. A. Allsman, D. R. Alves, T. S. Axelrod, A. C. Becker, D. P. Bennett, K. H. Cook, K. C. Freeman, K. Griest, J. Guern, M. J. Lehner, S. L. Marshall, D. Minniti, B. A. Peterson, M. R. Pratt, Peter J. Quinn, A. W. Rodgers, William J. Sutherland, D. L. Welch   +18 more
openalex   +1 more source