The First DIRECT Distance Determination to a Detached Eclipsing Binary in M33 | Zendy

A. Z. Bonanos | Zendy; K. Z. Stanek | Zendy; R. P. Kudritzki | Zendy; Lucas M. Macri | Zendy; Dimitar Sasselov | Zendy; J. Kałużny | Zendy; P. B. Stetson | Zendy; D. Bersier | Zendy; Fabio Bresolin | Zendy; T. Matheson | Zendy; B. J. Mochejska | Zendy; N. Przybilla | Zendy; Á. Szentgyörgyi | Zendy; J. Tonry | Zendy; Guillermo Torres | Zendy

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The First DIRECT Distance Determination to a Detached Eclipsing Binary in M33

Author(s) -

A. Z. Bonanos,

K. Z. Stanek,

R. P. Kudritzki,

Lucas M. Macri,

Dimitar Sasselov,

J. Kałużny,

P. B. Stetson,

D. Bersier,

Fabio Bresolin,

T. Matheson,

B. J. Mochejska,

N. Przybilla,

Á. Szentgyörgyi,

J. Tonry,

Guillermo Torres

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/508140

Subject(s) - photometry (optics) , distance modulus , physics , astrophysics , binary number , stars , spectroscopy , light curve , galaxy , astronomy , mathematics , arithmetic

We present the first direct distance determination to a detached eclipsingbinary in M33, which was found by the DIRECT Project. Located in the OB 66association at coordinates (alpha, delta)=(01:33:46.17,+30:44:39.9) forJ2000.0, it was one of the most suitable detached eclipsing binaries found byDIRECT for distance determination, given its apparent magnitude and orbitalperiod. We obtained follow-up BV time series photometry, JHKs photometry andoptical spectroscopy from which we determined the parameters of the system. Itcontains two O7 main sequence stars with masses of 33.4+/-3.5 Mo and 30.0+/-3.3Mo and radii of 12.3+/-0.4 Ro and 8.8+/-0.3 Ro, respectively. We derivetemperatures of 37000+/-1500 K and 35600+/-1500 K. Using BVRJHKs photometry forthe flux calibration, we obtain a distance modulus of 24.92+/-0.12 mag(964+/-54 kpc), which is ~0.3 mag longer than the Key Project distance to M33.We discuss the implications of our result and the importance of establishingM33 as an independent rung on the cosmological distance ladder.Comment: 36 pages, 12 figures, accepted for publication in Ap

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