Studies of early-type variable stars XII. Spectroscopic orbit and absolute parameters of AT Pegasi

Details Studies of early-type variable stars XII. Spectroscopic orbit and absolute parameters of AT Pegasi Studies of early-type variable stars XII. Spectroscopic orbit and absolute parameters of AT Pegasi

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..535m&link_type=abstract

Astronomy and Astrophysics 285, 535-540 (1994)

Astronomy and Astrophysics

Astrophysics

10

Stars: Binaries: Eclipsing, Techniques: Image Processing, Stars: At Peg, Stars: Fundamental Parameters

Scientific paper

A new spectroscopic orbit is presented for the Algol system AT Peg (HD 210892, P=1.146 days, α(2000.0)=22h13.4m, δ=+8deg25.5', A4V+G). We find : m_p_ sin ^3^i=2.04+/-0.06Msun_, m_s_ sin ^3^i=0.96+/-0.025Msun_, (a_p_+a_s_)sin i=4.62 +/-0.06 x 10^6^km, m_p_/m_s_=2.115+/-0.04. This is the first direct measure of the mass ratio for this system. The new mass ratio is used to solve the single colour light curve of Cristaldi & Walter (1963). We find the following absolute parameters: m_p_=2.22+/-0.065 Msun_, m_s_=1.05+/-0.025Msun_, =1.86+/-0.025Rsun_, =2.15+/- 0.03R , = 8400+/-100K, < T_s_ >=4900+/-200 K. The spectral type of the primary was established from a spectrum of the primary reconstructed from the spectroscopic data set using tomography. AT Peg is slightly reddened (E(B-V)=0.03+/-0.03) at a distance of 360+/-20parsecs.

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