ar X iv : a st ro - p h / 05 11 46 1 v 1 15 N ov 2 00 5 Spectroscopy of Four Cataclysmic Variables with Periods above 7 Hours 1

ar X iv : a st ro - p h / 05 11 46 1 v 1 1 5 N ov 2 00 5 Spectroscopy of Four Cataclysmic Variables with Periods above 7 Hours

We present spectroscopy of four cataclysmic variables. Using radial velocity measurements, we find orbital periods Porb for the first time. The stars and their periods are GY Hya, 0.347230(9) d; SDSS J204448-045929, 1.68(1) d; V392 Hya, 0.324952(5) d; and RX J1951.7+3716, 0.492(1) d. We also detect the spectra of the secondary stars, estimate their spectral types, and derive distances based on ...

ar X iv : a st ro - p h / 01 11 13 6 v 1 7 N ov 2 00 1 1 Active Optics in Modern , Large Optical Telescopes

ar X iv : a st ro - p h / 05 06 30 1 v 1 1 4 Ju n 20 05 Spectroscopic classification of cataclysmic variable candidates 1

We present low resolution optical spectroscopy for six cataclysmic variable candidates and the old nova V888Cen. We confirm the classification as cataclysmic variable for LB 9963 and FQMon, while the other four candidates turn out to be different type of stars. We discuss the individual spectra and pay special attention to the mass transfer rate and disc temperature and density of the three cat...

ar X iv : a st ro - p h / 05 11 83 5 v 1 3 0 N ov 2 00 5 Binaries with total eclipses in the LMC : potential targets for spectroscopy

35 Eclipsing binaries presenting unambiguous total eclipses were selected from a subsample of the list of Wyrzykowski et al. (2003). The photometric elements are given for the I curve in DiA photometry, as well as approximate Teff and masses of the components. The interest of these systems is stressed in view of future spectroscopic observations.

ar X iv : a st ro - p h / 97 11 16 3 v 1 1 4 N ov 1 99 7 Infrared observations of cataclysmic variables

We review infrared (1–2.5 µm) observations of cataclysmic variables, a relatively unexplored part of the spectrum in which the dominant sources of emission are the secondary star, the outer regions of the accretion disc and the accretion column in magnetic systems. We describe the advances that have been made in our understanding of cataclysmic variables based on infrared photometry and, more r...