The Visual Orbit of ι Pegasi
Abstract
We have determined the visual orbit for the spectroscopic binary ι Pegasi with interferometric visibility data obtained by the Palomar Testbed Interferometer in 1997. ι Peg is a double-lined binary system whose minimum masses and spectral typing suggests the possibility of eclipses. Our orbital and component diameter determinations do not favor the eclipse hypothesis: the limb-to-limb separation of the two components is 0.151+/-0.069 mas at conjunction. Our conclusion that the ι Peg system does not eclipse is supported by high-precision photometric observations. The physical parameters implied by our visual orbit and the spectroscopic orbit of Fekel & Tomkin are in good agreement with those inferred by other means. In particular, the orbital parallax of the system is determined to be 86.9+/-1.0 mas, and masses of the two components are determined to be 1.326+/-0.016 and 0.819+/-0.009 Msolar, respectively.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1999
- DOI:
- 10.1086/307030
- arXiv:
- arXiv:astro-ph/9811029
- Bibcode:
- 1999ApJ...515..356B
- Keywords:
-
- STARS: BINARIES: SPECTROSCOPIC;
- STARS: FUNDAMENTAL PARAMETERS;
- STARS: INDIVIDUAL (IOTA PEGASI);
- TECHNIQUES: INTERFEROMETRIC;
- Stars: Binaries: Spectroscopic;
- Stars: Fundamental Parameters;
- stars: individual (ι Pegasi);
- techniques: interferometric;
- Astrophysics
- E-Print:
- ApJ in press. 23 pages, 4 figures &