The Absolute Parallaxes of Four Magnetic CVs

Details The Absolute Parallaxes of Four Magnetic CVs The Absolute Parallaxes of Four Magnetic CVs

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop...31h&link_type=abstract

NOAO Proposal ID #2001A-0031

Physics

Scientific paper

We have an HST Cycle 9 and 10 program to measure the parallaxes of three magnetic cataclysmic variables (V1223 Sgr, EF Eri, and EX Hya). In addition, we had a Cycle 8 program that has successfully measured the relative parallax of TV Col. In our previous HST parallax program on three dwarf novae (Harrison et al. 1999), we found that the indirect distance estimation techniques failed to produce useful results. When we combined new infrared spectroscopy obtained using CRSP (on the KPNO 2.1 m) with the parallaxes and published optical/IR photometry, we found that the secondary stars in these three systems appeared to be too luminous for their observed spectral types. Our new program is designed to both determine if the secondary stars in magnetic systems are similarly unusual, as well as calorimeter the accretion rates in these four systems. To obtain accurate parallaxes, however, requires that we obtain the mean parallaxes of the reference frames. We request CTIO time to observe the reference stars of these four CV fields to obtain the necessary spectroscopy and photometry to determine the spectroscopic parallax of each reference star. We request two nights on the 0.9 m to obtain UBVRI photometry, and three nights on the 1.5 m to obtain optical spectroscopy for MK classification. We must know the mean parallaxes of the reference frames to determine the absolute parallaxes for these four CVs.

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