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Towards an Accurate Determination of Parameters for Very Massive Stars: the Eclipsing Binary LMC-SC1-105
Alceste Z. Bonanos
This paper presents a photometric and spectroscopic study of the bright blue eclipsing binary LMC-SC1-105, selected from the OGLE catalog as a candidate host of very massive stars…
'Slow' and Fast Rotators among Hypervelocity Stars
Mercedes Lopez-Morales, Alceste Z. Bonanos
We measure the projected rotational velocities of the late B-type hypervelocity stars HVS7 and HVS8 from high resolution spectroscopy to be 60 +/- 17 km/s and 260 +/- 70 km/s. The…
Low Metallicity Indicates that the Hypervelocity Star HE 0437-5439 was Ejected from the LMC
Alceste Z. Bonanos, Mercedes Lopez-Morales, Ian Hunter +1
We measure the metallicity of the unusual hypervelocity star HE 0437-5439 from high resolution spectroscopy to be half-solar. We determine a spectral type of B2 IV-III for the star…
Detection of a Variable Infrared Excess Around SDSS 121209.31+013627.7
J. H. Debes, M. Lopez-Morales, A. Z. Bonanos +1
We present near-infrared photometry and light curves of the candidate magnetic white dwarf+brown dwarf binary SDSS J121209.31+013627.7 and report on the detection of near-i…