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gravitation microlensing event TCP_J05074264+2447555

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Robin Leadbeater
gravitation microlensing event TCP_J05074264+2447555

An R~500 spectrum of this object taken near maximum light using an ALPY 600 spectrograph.  A significantly reddened F5v star. If this is as predicted a gravitational microlensing event, the spectrum should not change as the brightness returns to normal.

Blue - measured spectrum 

Red - F5v Pickles reference spectrum

Green - measured/reference (smoothed)

Interestingly  I also recorded an early spectrum of  the similar event in 2006 (Var 06 Cas)  using a Star Analyser, confirming from the spectrum that it  was not a typical variable.

http://www.threehillsobservatory.co.uk/astro/spectra_30.htm

Cheers

Robin

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484