First spectroscopic confirmation of a microlensing event towards the galactic bulge

Details First spectroscopic confirmation of a microlensing event towards the galactic bulge First spectroscopic confirmation of a microlensing event towards the galactic bulge

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294l..37b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 294, no. 2, p. L37-L40

Astronomy and Astrophysics

Astrophysics

25

Astronomical Spectroscopy, Galactic Bulge, Gravitational Lenses, Stellar Spectra, Subgiant Stars, Visible Spectrum, Distance, Galactic Halos, Galactic Structure, Interstellar Extinction, Radial Velocity, Variable Stars

Scientific paper

We present low resolution spectra (3800-7000 A; approximately 13 A) of a 20-mag star in the direction of the galactic bulge that presumably underwent a microlensing event in early September 1994. Thanks to the immediate alert, for the first time it was possible to observe the star near the moment of maximum intensity. The comparison with a spectrum obtained after the fading shows no spectral variations. This is a compelling evidence that the brightening was indeed caused by gravitational lensing, excluding the possibility that the event was due to some class of variable star. We conclude that the lensed star is a late G/early K subgiant (spectral class most probably K0 IV), moderately reddened (E(B-V) approximately 0.75) at a distance of 8.5-4+6 kpc and with a relatively high radial velocity (-400 +/- 50 km/sec), i.e., the star is probably located quite close to the galactic center.

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