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The ELM Survey. II. Twelve Binary White Dwarf Merger Systems
Mukremin Kilic, Warren R. Brown, Carlos Allende Prieto +3
We describe new radial velocity and X-ray observations of extremely low-mass white dwarfs (ELM WDs, ~0.2 Msol) in the Sloan Digital Sky Survey Data Release 4 and the MMT Hyperveloc…
The ELM Survey. I. A Complete Sample of Extremely Low Mass White Dwarfs
Warren R. Brown, Mukremin Kilic, Carlos Allende Prieto +1
We analyze radial velocity observations of the 12 extremely low-mass <0.25 Msol white dwarfs (WDs) in the MMT Hypervelocity Star Survey. Eleven of the 12 WDs are binaries with orbi…
The Merger Rate of Extremely Low Mass White Dwarf Binaries: Links to the Formation of AM CVn Stars and Underluminous Supernovae
Warren R. Brown, Mukremin Kilic, Carlos Allende Prieto +1
We study a complete, colour-selected sample of double-degenerate binary systems containing extremely low mass (ELM) <0.25 Msol white dwarfs (WDs). We show, for the first time, that…
The SEGUE Stellar Parameter Pipeline. V. Estimation of Alpha-Element Abundance Ratios From Low-Resolution SDSS/SEGUE Stellar Spectra
Young Sun Lee, Timothy C. Beers, Carlos Allende Prieto +7
We present a method for the determination of [alpha/Fe] ratios from low-resolution (R = 2000) SDSS/SEGUE stellar spectra. By means of a star-by-star comparison with degraded spectr…
Bridging Model and Observed Stellar Spectra
Carlos Allende Prieto
Accurate model stellar fluxes are key for the analysis of observations of individual stars or stellar populations. Model spectra differ from real stellar spectra due to limitations…
Spectroscopy from Photometry Using Sparsity. The SDSS Case Study
A. Asensio Ramos, C. Allende Prieto
We explore whether medium-resolution stellar spectra can be reconstructed from photometric observations, taking advantage of the highly compressible nature of the spectra. We formu…