PARALLACTIC VARIATION OF GRAVITATIONAL LENSING AND MEASUREMENT OF STELLAR MASS

Authors
HOSOKAWA M OHNISHI K FUKUSHIMA T TAKEUTI M
Citation
M. Hosokawa et al., PARALLACTIC VARIATION OF GRAVITATIONAL LENSING AND MEASUREMENT OF STELLAR MASS, Astronomy and astrophysics, 278(2), 1993, pp. 27-30
Citations number
18
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
278
Issue
2
Year of publication
1993
Pages
27 - 30
Database
ISI
SICI code
0004-6361(1993)278:2<27:PVOGLA>2.0.ZU;2-#
Abstract
An application of the gravitational lensing is proposed for measuring the mass of a single star. It is shown that the mass and distance of a star are determined from the observation of parallactic variation of separation angles between the star and background point sources suffer ing the gravitational deflection by the star. In the case of annual pa rallax, this change will amount to the order of 10 micro-arc seconds f or a star with 5M. mass at a distance of 60 pc and background sources with an angular separation of 1 arc second from the star. This effect will be detectable in the near future by some observation plans now be ing developed.