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The eclipsing millisecond pulsar PSR J1740-5340 and its red straggler companion
Jerome A Orosz, Marten H. van Kerkwijk
We present a high-resolution echelle spectrum taken with the Very Large Telescope and analyse archival Hubble Space Telescope photometry of the recently identified companion of the…
A Probable Optical Counterpart for the Isolated Neutron Star RX J1308.6+2127
D. K. Kaplan, S. R. Kulkarni, M. H. van Kerkwijk
Using a very deep observation with HST/STIS, we have searched for an optical counterpart to the nearby radio-quiet isolated neutron star RX J1308.6+2127 (RBS 1223). We have identif…
Pulsating or not? A search for hidden pulsations below the red edge of the ZZ instability strip
Rubina Kotak, Marten H. van Kerkwijk, J. Christopher Clemens +1
The location of the red edge of the ZZ Ceti instability strip is defined observationally as being the lowest temperature for which a white dwarf with a H-rich atmosphere (DA) is kn…
Time-resolved optical spectroscopy of the pulsating DA white dwarf HS 0507+0434B: New constraints on mode identification and pulsation properties
Rubina Kotak, Marten H. van Kerkwijk, J. Christopher Clemens
We present a detailed analysis of time-resolved optical spectra of the ZZ Ceti white dwarf, HS 0507+0434B. Using the wavelength dependence of observed mode amplitudes, we deduce th…