The Pre-Main-Sequence Eclipsing Binary TY Coronae Australis: Precise Stellar Dimensions and Tests of Evolutionary Models

Details The Pre-Main-Sequence Eclipsing Binary TY Coronae Australis: Precise Stellar Dimensions and Tests of Evolutionary Models The Pre-Main-Sequence Eclipsing Binary TY Coronae Australis: Precise Stellar Dimensions and Tests of Evolutionary Models

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115.1617c&link_type=abstract

The Astronomical Journal, Volume 115, Issue 4, pp. 1617-1633.

Astronomy and Astrophysics

Astronomy

68

Binaries: Eclipsing, Stars: Evolution, Stars: Individual: Ty Coronae Australis

Scientific paper

We analyze new photometric data for the Herbig Be eclipsing binary TY CrA, which securely reveal the secondary eclipse, ~0.03 mag deep in y. From the light-curve solution and our previous spectroscopic data, absolute dimensions of the primary and secondary stars are derived. The masses are found to be M_1 = 3.16 +/- 0.02 M_&sun; and M_2 = 1.64 +/- 0.01 M_&sun;, the radii are R_1 = 1.80 +/- 0.10 R_&sun; and R_2 = 2.08 +/- 0.14 R_&sun;, the luminosities are L_1 = 67 +/- 12 L_&sun; and L_2 = 2.4 +/- 0.8 L_&sun;, and the effective temperatures are T_1 = 12,000 +/- 500 K and T_2 = 4900 +/- 400 K. Here the uncertainties represent high-confidence limits, not standard deviations. The secondary star is a pre-main-sequence star located at the base of the Hayashi tracks. As such, it is the least evolved star with a dynamically measured mass. Given higher effective temperatures for the primary (e.g., 12,500 K), the solar-composition 1.64 M_&sun; evolutionary tracks of Swenson et al., Claret, and D'Antona & Mazzitelli are all consistent with the properties of the TY CrA secondary and suggest an age of order 3 Myr. The radius and projected rotational velocity of the secondary star are consistent with synchronous rotation. The primary star is located near the zero-age main sequence, which, for solar compositions, is consistent with an age of 3 Myr. However, the primary star is not well represented by any of the 3.16 M_&sun; evolutionary models, which predict somewhat higher effective temperatures than observed.

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