Radii and masses for young star AR Aurigae

Details Radii and masses for young star AR Aurigae Radii and masses for young star AR Aurigae

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..787n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. 787-800

Astronomy and Astrophysics

Astrophysics

34

B Stars, Eclipsing Binary Stars, Light Curve, Radii, Stellar Composition, Stellar Evolution, Stellar Mass, Stellar Models, Abundance, Mathematical Models, Metallicity, Radial Velocity, Solar Neighborhood, Stellar Luminosity, Stellar Spectrophotometry, Stellar Temperature

Scientific paper

Improved radii, masses and temperatures of the unevolved B-type binary AR Aurigae are determined by analyzing available light and radial velocity curves, in particular the previously neglected B, V light curves by O'Connell. New times of minimum are used to improve the light-time orbit of AR Aur AB around the centre of gravity of this triple system, and the period variations are taken into account in the photometric analysis. A new spectroscopic determination of the luminosity ratio is used to constrain the ratio of the radii, k = rB/rA, which is indeterminate from the photometric light curves; we find k = 1.020 +/- 0.015. The resulting physical parameters of the eclipsing stars are: masses: MA = 2.48 solar mass, MB = 2.29 solar mass; radii: RA = 1.78 solar radius, RB = 1.82 solar radius; effective temperatures: TA = 10 950K, TB = 10 350K; log gA = 4.33, log gB = 4.28. Our revised value of k implies, with high probability, that log gA greater than log gB, suggesting that AR Aur B is in the final stage of contraction towards the zero-age main sequence (ZAMS). The measured rotational velocities correspond to synchronous rotation in the circular orbit. Comparison with new stellar evolution models indicates that AR Aur has a metal abundance no larger than the much older Sun, in agreement with recent spectroscopic investigations of young B and F stars in the solar neighborhood. This implies that the galactic disk in the solar has not been uniformly enriched in metals over the last approximate 5 Gyr.

Affiliated with

Also associated with

No associations

Rating

Radii and masses for young star AR Aurigae 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 Radii and masses for young star AR Aurigae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radii and masses for young star AR Aurigae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1013182