Studies of Early Type Variable Stars - Part Nine - the Orbit and Physical Parameters of V1425-CYGNI

Details Studies of Early Type Variable Stars - Part Nine - the Orbit and Physical Parameters of V1425-CYGNI Studies of Early Type Variable Stars - Part Nine - the Orbit and Physical Parameters of V1425-CYGNI

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276...57h&link_type=abstract

Astronomy and Astrophysics, Vol.276, NO. 1/SEPI, P. 57, 1993

Astronomy and Astrophysics

Astrophysics

8

Binaries: Eclipsing, Stars: Individual V1425 Cyg, Stars: Fundamental Parameters, Stars: Early-Type

Scientific paper

From a new spectroscopic orbit of the early-type binary system V1425 Cygni we find mP sin3 i = 3.82±0.07Msun, mSsin3i = 2.45±0.05Msun, (aP + aS) sin i = 9.01±0.07Rsun and mP/mS = 1.56±0.03. The velocity measures were determined iteratively by fitting each cross-correlation function with a digital profile generated from an observation at conjunction. These measures were then used as the basis for a tomographic reconstruction of the mean primary and secondary spectra. In turn digital masks generated from cross-correlation functions (ccf's) of these spectra yielded revised velocities and better orbits with systemic velocities in close accord.
A spectrophotometric analysis indicates that the light ratio (p/s) is 1.72±0.15 which value in turn constrains the light-curve solution to that of a semi-detached system. V1425 Cygni had been thought to be a reverse Algol but our results rule conclusively against this interpretation. However the primary is well-evolved, occupying 92% of the inner Lagrangian lobe. Absolute dimensions have been determined for the system which is reddened [E(B - V) = 0.m16±0.m01] at a distance of 510i35 pc.

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