Rotational Velocities of S-Type Symbiotic Stars
نویسندگان
چکیده
منابع مشابه
Rotational velocities of A - type stars ⋆ , ⋆ ⋆
Within the scope of a Key Programme determining fundamental parameters of stars observed by HIPPARCOS, spectra of 525 B8 to F2-type stars brighter than V = 8 have been collected at ESO. Fourier transforms of several line profiles in the range 4200–4500 Å are used to derive v sin i from the frequency of the first zero. Statistical analysis of the sample indicates that measurement error is a func...
متن کاملRotational velocities of A - type stars ⋆ III . Velocity distributions
Aims. In this work, a sample of v sin i of B9 to F2-type main sequence single stars has been built from highly homogeneous v sin i parameters determined for a large sample cleansed from objects presenting the Am and Ap phenomenon as well as from all known binaries. The aim is to study the distributions of rotational velocities in the mass range of A-type stars for normal single objects. Methods...
متن کاملRotational velocities of the giants in symbiotic stars : II . Are they synchronized ? ⋆
We have measured the rotational velocities (v sin i) of the mass donors for 36 symbiotic stars using the cross-correlation function (CCF) method. We got a meaningful CCF for 29 objects and we derived only upper limits for 7 objects (v sin i< 3.5 km s, 6 out of these 7 are symbiotic Miras). In a sub-sample of 16 S–type symbiotic stars (with known orbital periods and well measured v sin i) 15 hav...
متن کاملSpectropolarimetric orbits of symbiotic stars: five S-type systems
We present multi-epoch, high signal-to-noise spectropolarimetry of the Raman-scattered emission lines of five S-type symbiotic binaries: CD−43◦14304, Hen 1242, M1-21, SY Mus, and V455 Sco. The Raman-line polarizations and magnitudes are used to estimate orbital parameters for these systems. Two of the five systems (CD−43◦14304 and SY Mus) have published radial-velocity orbits, which agree with ...
متن کاملIrradiated red giant atmospheres in S-type symbiotic stars
We present non-LTE calculations for an expanding red giant’s atmosphere ionized from the outside by the radiation of a nearby hot radiation source. We show that the hydrogen emission lines emerge from a narrow transition zone where hydrogen changes from ionized to neutral. In this region the Balmer lines are optically thick, and their profiles crucially depend on the magnitude of optical thickn...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2004
ISSN: 0074-1809
DOI: 10.1017/s007418090019549x