AG Persei: Absolute dimensions and membership of Perseus OB2

Details AG Persei: Absolute dimensions and membership of Perseus OB2 AG Persei: Absolute dimensions and membership of Perseus OB2

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..795g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 795-804

Astronomy and Astrophysics

Astrophysics

37

B Stars, Eclipsing Binary Stars, Radii, Star Clusters, Stellar Evolution, Stellar Mass, Stellar Models, Stellar Temperature, Distance, Ephemerides, Light Curve, Orbital Elements, Relativistic Effects, Stellar Composition, Stellar Spectrophotometry

Scientific paper

Accurate physical parameters for the B-type eclipsing binary AG Per (HD 25833; B4 V, V = 6.7, P = 2.03 days) have been determined for a complete re-analysis of available light curves and recent spectrscopic elements (Popper & Hill 1991). The components have masses of 5.36 +/- 0.16 and 4.90 +/- 0.13 solar mass and radii of 2.99 +/- 0.07 and 2.60 +/- 0.07 solar radii, respectively, and they are among the least evolved B stars with well-determined dimensions. Effective temperatures of 18 200 +/- 800 K and 17b 400 +/- 800 K are derived. The orbit is slightly eccentric (e = 0.0710 +/- 0.0010) and shows apsidal motion with a well-established period of U = 75.6 +/- 0.6 yr. Comparison with stellar evolution models based on the latest opacity library by Rogers & Iglesias (1992) and including a moderate amount of convective overshooting (Claret & Gimenez 1992) shows AG Per to be young; an age of about 4-6 107 yr is derived from the scale independent masses and radii. AG Per is too little evolved to provide any constraints on the amount of convective overshooting. The mean density concentration coefficient determined from the apsidal motion parameters, log k2 = -2.14 +/- 0.04, agrees well with that computed for the models, provided a relativistic correction based on the general relativity theory is included. In its present formulation and calibration the alternative non-symmetric gravitational theory proposed by Moffat (1989) is not supported. AG Per is generally accepted as a member of Per OB2. We find a distance of 355 +/- 30 pc for the binary, compared to 330-420 pc given by various authors for the association. New stellar models and calibrations indicate a photometric age of about 1-1.5 107 yr for Per OB2, larger than previously obtained but still well below that of AG Per (4-6 107 yr. This weakens the status of AG as a member. New observations of (potential Per OB2 members, including fainter stars, are clearly needed.

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