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Exploring the Virgo Stellar Stream with SEKBO Survey RR Lyrae Stars
Sayuri L Prior, G S Da Costa, Stefan C Keller +1
A subset of the RR Lyrae (RRL) candidates identified from the Southern Edgeworth-Kuiper Belt Object (SEKBO) survey data has been followed up photometrically (n=106) and spectroscop…
The Extragalactic Distance Scale without Cepheids
Jeremy Mould, Shoko Sakai
Distances of galaxies in the Hubble Space Telescope Key Project are based on the Cepheid period-luminosity relation. An alternative basis is the tip of the red giant branch. Using…
Cepheid Mass-loss and the Pulsation -- Evolutionary Mass Discrepancy
Stefan C. Keller
I investigate the discrepancy between the evolution and pulsation masses for Cepheid variables. A number of recent works have proposed that non-canonical mass-loss can account for…
Revealing Substructure in the Galactic Halo - The SEKBO RR Lyrae Survey
Stefan C. Keller, Simon Murphy, Sayuri Prior +2
We present a search for RR Lyrae variable stars from archival observations of the Southern Edgeworth-Kuiper Belt Object survey. The survey covers 1675 square degrees along the ecli…
Ultra-Low Amplitude Cepheids in the Large Magellanic Cloud
J. Robert Buchler, Peter R. Wood, Stefan Keller +1
The MACHO variables of LMC Field 77 that lie in the vicinity of the Cepheid instability strip are reexamined. Among the 144 variables that we identify as Cepheids we find 14 that h…
Long Period Variables in the LMC: Results from MACHO and 2MASS
Oliver J. Fraser, Suzanne L. Hawley, Kem H. Cook +1
We use the eight year light-curve database from the MACHO (MAssive Compact Halo Objects) project together with infrared colors and magnitudes from 2MASS (the Two Micron All Sky Sur…