The Metallicity Of The Hypervelocity Star HE 0437-5439 Is Half-solar: Evidence For A Massive Black Hole In The LMC

Details The Metallicity Of The Hypervelocity Star HE 0437-5439 Is Half-solar: Evidence For A Massive Black Hole In The LMC The Metallicity Of The Hypervelocity Star HE 0437-5439 Is Half-solar: Evidence For A Massive Black Hole In The LMC

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21116301l&link_type=abstract

American Astronomical Society, AAS Meeting #211, #163.01

Astronomy and Astrophysics

Astronomy

Scientific paper

We measure the metallicity of the unusual hypervelocity star HE 0437-5439 to be half-solar, establishing its origin in the Large Magellanic Cloud. We find the star to be a B2 III-IV with a temperature of Teff = 22000 +/- 1000K and surface gravity of log(g) = 4.00 +/- 0.25 dex. We also present BV time series photometry showing that the star is not variable at the 0.02 mag level. We refine the magnitude to V= 16.36 +/- 0.04 mag, with a color B-V= -0.23 +/- 0.03 mag, confirming the early-type nature of the star and implying a greater distance from our Galaxy. The fact that HE 0437-5439 originated in the LMC implies the existence of an intermediate mass black hole somewhere in this galaxy.

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