1999A&A...349..169D


Query : 1999A&A...349..169D

1999A&A...349..169D - Astronomy and Astrophysics, volume 349, 169-176 (1999/9-1)

Circumstellar matter around M-giants in symbiotic binaries: SY Muscae and RW Hydrae.

DUMM T., SCHMUTZ W., SCHILD H. and NUSSBAUMER H.

Abstract (from CDS):

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)≃5x10–7M/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 FeII. 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.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: binaries: symbiotic - stars: late-type - stars: mass-loss - stars: individual: SY Mus - stars: individual: RW Hya

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* EG And Sy* 00 44 37.1873792808 +40 40 45.704829252 10.54 8.93 7.22     M2.4III 275 0
2 V* SY Mus Sy* 11 32 09.9955543536 -65 25 11.458124364   11.97 10.20     M4 159 0
3 V* RW Hya Sy* 13 34 18.1289607744 -25 22 48.881433972   11.51 10.00     M1/2IIIe 191 0
4 V* BF Cyg Sy* 19 23 53.5006095432 +29 40 29.177024952   10.52 9.30     Bep+M5III 269 0
5 EM* AS 373 Sy* 19 57 05.0166505224 +39 49 36.076143036     11.50   10.592 M6/8e 575 0
6 V* PU Vul Sy* 20 21 13.3111130136 +21 34 18.697391652   11.13 10.87 11.697   M3+F2Ib 298 0

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2022.07.03-07:30:45

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