Seismology of delta Scuti stars in the Praesepe cluster. II. Identification of radial modes and their associated stellar parameters

Details Seismology of delta Scuti stars in the Praesepe cluster. II. Identification of radial modes and their associated stellar parameters Seismology of delta Scuti stars in the Praesepe cluster. II. Identification of radial modes and their associated stellar parameters

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...338..511h&link_type=abstract

Astronomy and Astrophysics, v.338, p.511-520 (1998)

Astronomy and Astrophysics

Astrophysics

12

Stars: Oscillations, Delta Scu, Open Clusters And Associations: Individual: Praesepe

Scientific paper

An analysis based on a comparison between observations and stellar models has been carried out to identify radial modes of oscillations in several multi-periodic delta Scuti stars of the Praesepe cluster (BU, BN, BW and BS Cnc). The assumption that all the stars considered have common parameters, such as metallicity, distance or age, is imposed as a constraint. Even so, there is a large number of possible solutions, partially caused by the rotational effects on the pulsation frequencies and on the stars' positions in the HR diagram, which need to be parameterized. When pairs of radial modes are assumed to be present in every star, only a few similar identifications are found to be possible, corresponding to a metallicity of Z ~ 0.030 and an amount of overshooting of alpha_ov ~ 0.20. They are associated with a distance modulus of ~ 6.43 and an age of ~ 650 Myr. Estimates of mass and rotation rates for each star are also deduced.

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