The distance to the Andromeda Galaxy from eclipsing binaries

Details The distance to the Andromeda Galaxy from eclipsing binaries The distance to the Andromeda Galaxy from eclipsing binaries

2009-11-17

arxiv.org/abs/0911.3391v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 3 figures, accepted for publication in A&A (Nov 6, 2009)

Scientific paper

The cosmic distance scale largely depends on distance determinations to Local Group galaxies. In this sense, the Andromeda Galaxy (M31) is a key rung to better constrain the cosmic distance ladder. A project was started in 1999 to firmly establish a direct and accurate distance to M31 using eclipsing binaries (EBs). After the determination of the first direct distance to M31 from EBs, the second direct distance to an EB system is presented: M31V_J00443610+4129194. Light and radial velocity curves were obtained and fitted to derive the masses and radii of the components. The acquired spectra were combined and disentangled to determine the temperature of the components. The analysis of the studied EB resulted in a distance determination to M31 of (m-M)o = 24.30 +/- 0.11 mag. This result, when combined with the previous distance determination to M31, results in a distance modulus of (m-M)o = 24.36 +/- 0.08 mag (744 +/- 33 kpc), fully compatible with other distance determinations to M31. With an error of only 4%, the obtained value firmly establishes the distance to this important galaxy and represents the fulfillment of the main goal of our project.

Affiliated with

Also associated with

No associations

Rating

The distance to the Andromeda Galaxy from eclipsing binaries does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The distance to the Andromeda Galaxy from eclipsing binaries, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The distance to the Andromeda Galaxy from eclipsing binaries will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-239886