Query : 1999A&A...347..932B

1999A&A...347..932B - Astronomy and Astrophysics, volume 347, 932-936 (1999/7-3)

The long-period RS Canum Venaticorum binary IM Pegasi. I. Orbital and stellar parameters.


Abstract (from CDS):

New high-resolution and high signal-to-noise ratio spectroscopic observations carried out in 1996-1997 are analysed. A total of 85 new high quality radial velocity measurements are used for determining the new orbital parameters: Tconj=HJD2450342.883+24.64880E, e=0.0, γ=-14.09km/s, K1=34.39km/s. A model atmosphere analysis of the averaged spectrum of the star has yielded a self-consistent set of fundamental parameters of the primary component: Teff=4450K, logg=2.4, [M/H]=0.0, ξt=1.6km/s, vsini=26.5km/s. The primary is found to be a typical K2 III giant with the mass of about 1.5M which has undergone the first convective mixing on the Red Giant Branch ([C/H]=-0.32, [N/H]=0.30, C/N=1.15). The unspotted V magnitude of the star of 5.55mag is estimated from the observed variations of the TiO band and quasi-simultaneous photometry. Combining all parameters, the radius and inclination of the primary as well as a probable spectral class of the secondary are estimated.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: activity - stars: binaries: spectroscopic - stars: fundamental parameters - stars: individual: IM Peg - stars: late-type

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1075 1
2 V* IM Peg RS* 22 53 02.2663977960 +16 50 28.300547040   7.024 5.890     K2III 324 1

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