Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...349..169d&link_type=abstract
Astronomy and Astrophysics, v.349, p.169-176 (1999)
Astronomy and Astrophysics
Astrophysics
19
Stars: Circumstellar Matter, Stars: Binaries: Symbiotic, Stars: Late-Type, Stars: Mass-Loss, Stars: Individual: Sy Mus, Stars: Individual: Rw Hya
Scientific paper
For the eclipsing symbiotic binary system SY Mus we present evidence for an asymmetric density distribution around the M-giant. We obtain this result from an improved orbital solution. We determine a revised orbital period of P=625.0+/- 0.5 d from UV eclipse observations and a re-analysis of the visual light curve. Based on new radial velocity observations, we measure the epoch of mid-eclipse accurately to within +/- 6 days, or 1/100 of the period. At ingress the eclipse curve is steeper and closer to mid-eclipse than at egress. From measured column densities of neutral hydrogen during egress we conclude that the mass loss rate of the M-giant is of the order of dot {M} ~5*10(-7) Msun/yr. The eclipse of the UV light in SY Mus and RW Hya can be partially explained by Rayleigh scattering but there is also an additional source of opacity. HST high resolution UV observations of RW Hya during egress reveal that this additional flux attenuation is due to blanketing by numerous absorption lines, predominantly Fe ii. Line blanketing is an important effect that has to be taken into account to explain the eclipse of SY Mus and of other symbiotic binaries. Based on observations made with IUE, HST and at the European Southern Observatory at La Silla (Chile). ESO observations were granted for the proposals 47.7-081, 48.7-083, 49.7-041, 50.7-129, 51.7-093, 52.7-068, 53.7-083, 54.E-061, 55.E-446, 56.E-526 57.D-684, 58.D-248, 59.D-700, 60.D-714. The visual brightness estimates were done by the RASNZ.
Dumm Th.
Nussbaumer Harry
Schild Hans
Schmutz Werner
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