The strange evolution of the Large Magellanic Cloud Cepheid OGLE-LMC-CEP1812 [PDF]
, 2015 Classical Cepheids are key probes of both stellar astrophysics and cosmology as standard candles and pulsating variable stars. It is important to understand Cepheids in unprecedented detail in preparation for upcoming GAIA, JWST and extremely-large ...
Ignace, Richard +3 more
core +3 more sources
First detection of CO emission from Cepheid Variable stars
, 2023 We present IRAM 30~m Telescope observations of the CO(1-0) and CO(2-1) emission lines in a sample of eight Cepheid variable stars. The CO(1-0) line is detected in four of the eight targets at a signal-to-noise of $>$3.5 confirming the presence of CO in Cepheid atmospheres.
Hamer, S. L., Ardern, S., Scowcroft, V.
openaire +2 more sources
Equidistant frequency triplets in pulsating stars: The Combination Mode Hypothesis [PDF]
, 2006 Multiplet structures are a common feature in pulsating stars, and can be the consequence of rotational splitting, mode interaction or sinusoidal amplitude variations.
Breger, M., Kolenberg, K.
core +3 more sources
M33 Cepheids from CFHT/MegaCam Survey
The Astronomical Journal, 2022 In this paper we analyze Sloan g, r, i archival imaging data of M33 taken by Hartman et al. using MegaCam at the Canada–France–Hawaii Telescope. To determine the distance to the M33 galaxy, we performed several analytical steps to identify its Cepheid ...
Samuel Adair, Chien-Hsiu Lee
doaj +1 more source
The MACHO Project LMC Variable Star Inventory: Classical Cepheids, AGB Variables, and the Nine Million Star Color-Magnitude Diagram [PDF]
Symposium - International Astronomical Union, 1999 We measure the ratio of ~ 5M⊙ blue and red LMC supergiants (representative of classical Cepheids) using the MACHO Project's 9 million star color-magnitude diagram (9M CMD) of the LMC bar. We find b/r = 0.39, which favors the Z=0.008, 5M⊙ theoretical model of Schaerer et al. (1993) over that of Fagatto et al. (1994).
Alves, DR, Basu, A, Cook, KH, Welch, DL
openaire +5 more sources
Double-Mode Radial Pulsations among RR Lyrae Stars [PDF]
, 2014 Double-mode RR Lyr type stars are important for studies of properties of horizontal-branch stars. In particular, two periods coupled with spectral properties give a mass estimate that is independent of evolutionary models.
Poleski, R.
core +1 more source
ULTRA-LOW AMPLITUDE VARIABLES IN THE LARGE MAGELLANIC CLOUD—CLASSICAL CEPHEIDS, POP. II CEPHEIDS, RV TAU STARS, AND BINARY VARIABLES [PDF]
The Astrophysical Journal, 2009 A search for variable stars with ultra-low amplitudes (ULAs), in the millimagnitude range, has been made in the combined MACHO and OGLE databases in the broad vicinity of the Cepheid instability strip in the HR diagram. A total of 25 singly periodic and 4 multiply periodic ULA objects have been uncovered.
Buchler, Robert +2 more
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Period–Luminosity Relations for Galactic Classical Cepheids in the Sloan Bands
The Astrophysical Journal, 2023 We present the first period–luminosity (PL) and period–Wesenheit (PW) relations in the Sloan–Pan-STARRS g _P _1 r _P _1 i _P _1 bands for classical fundamental-mode Cepheids in the Milky Way.
Weronika Narloch +8 more
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A Search for Distant Galactic Cepheids Toward l=60 [PDF]
, 1997 We present results of a survey of a 6-square-degree region near l=60, b=0 to search for distant Milky Way Cepheids. Few MW Cepheids are known at distances >~ R_0, limiting large-scale MW disk models derived from Cepheid kinematics; this work was designed
Burke E. W. +6 more
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Highlights on eclipsing binary variables from Araucaria Project
EPJ Web of Conferences, 2015 The Araucaria Project, which main goal is to provide precise determination of the cosmic distance scale, has recently made a set of discoveries involving variable stars in binary systems. Among these discoveries we highlight three: 1% precise measurement
Karczmarek Paulina +10 more
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