The Remarkable Visual Binary System VW Ari: Chemical Composition of its Components
Abstract
We present results of a spectroscopic investigation of the A and B components of the visual binary VW Ari. Results are: 1) the atmospheric parameters for the stars are Teff = 7100 K, log g = 3.7 (A component), Teff = 7300 K, log g=4.3, V_t = 1.9 km s^-1 (B component); 2) the masses and radii are R_A ~ 3.5 R_sun, R_B ~ 1.6 R_sun; M_A ~2.2 M_sun, M_B ~ 1.8 M_sun; 3) abundances of 16 elements have been determined for VW Ari B. This star shows solar-like chemical composition for most of the elements. 4) Because of the complicated spectrum of VW Ari A (only a few very shallow lines are seen), we were able to estimate only Ca and Fe abundances in its atmosphere: [Ca/H] = -0.73, [Fe/H] = -0.46. The remarkable metallicity difference between the components strongly supports the hypothesis of stellar capture as most probable origin of the VW Ari system. (SECTION: Stars)
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- March 1995
- DOI:
- 10.1086/133542
- Bibcode:
- 1995PASP..107..219A
- Keywords:
-
- Abundance;
- Binary Stars;
- Size Determination;
- Stellar Atmospheres;
- Stellar Composition;
- Stellar Mass;
- Stellar Spectra;
- Stellar Temperature;
- Astronomical Spectroscopy;
- Atmospheric Composition;
- Calcium;
- Data Reduction;
- Iron;
- Metallicity;
- Spectrum Analysis;
- Astronomy;
- BINARIES: VISUAL;
- STARS: INDIVIDUAL: VW ARI;
- STARS: ABUNDANCES