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Astron. Astrophys. 354, 1014-1020 (2000)

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2. UV observations

RW Hya has been observed at various orbital phases with IUE. It has also been observed at three orbital phases with the Goddard High Resolution Spectrograph (GHRS) of the Hubble Space Telescope (HST). A log of all IUE low resolution large aperture observations is given in Kenyon & Mikolajewska (1995). For this work, we employ all available, non-saturated IUE low resolution large aperture spectra. In Table 1 we give the average continuum flux in the interval between [FORMULA] and [FORMULA], hereafter called [FORMULA].


Table 1. RW Hya continuum flux variation at [FORMULA] as measured in the 10 IUE low resolution spectra and the 3 HST low resolution spectra after convolving them down to IUE low resolution. Flux in units of [FORMULA].

A log of the available HST GHRS observations is given in Dumm et al. (1999). Here we use all the GHRS low resolution spectra and we analyze the medium resolution spectrum of N V [FORMULA] for signatures of a stellar wind (Sect. 4).

The orbital phase [FORMULA] for a given Julian date is taken from the ephemeris of Kenyon & Mikolajewska (1995) and Schild et al. (1996). Both ephemeris are based on radial velocity measurements derived from M-star spectra, and are in very good agreement. We take the average of the two solutions:


The phase [FORMULA] corresponds to mid-eclipse of the white dwarf by the M-giant.

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© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000