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Title:
Doppler imaging of stellar surface structure. IV. The rapidly-rotating G5III-IV star HD 112313 = IN Comae.
Authors:
Strassmeier, K. G.; Hubl, B.; Rice, J. B.
Publication:
Astronomy and Astrophysics, v.322, p.511-522 (A&A Homepage)
Publication Date:
06/1997
Origin:
A&A via CDS
A&A Keywords:
STARS: ACTIVITY, STARS: IMAGING, STARS: INDIVIDUAL: IN COM, STARS: CHROMOSPHERES, STARSPOTS, BINARIES: CLOSE
Bibliographic Code:
1997A&A...322..511S

Abstract

We present the first Doppler image of the rapidly-rotating G5 giant in the unusual IN Comae triple system. Our average image from three spectral regions and two continuum color indices shows mostly low to high latitude features but not a prominent polar cap-like spot. A parameter study of the stellar and atomic input quantities aims to better quantify the reliability of our Doppler image. A time series of 330 high-precision Stroemgren by and Johnson V measurements in 1996 show only one real photometric period (5.913+/-0.005days) that we interpret to be the rotation period of the G5 giant. We found no evidence for the 0.25-day period claimed earlier by Kuczawska & Mikolajewski (1993AcA....43..445K). Optical spectra of several activity indicators are presented and discussed. IN Comae exhibits an unusual broad Hα emission line and a central absorption feature. This profile shape is also seen for the CaII infrared-triplet lines as well as for the sodium doublet and the HeI D_3_ line. No LiI 6707.8 line is present. New radial velocity measurements from our red-wavelength spectra do not indicate a short-period binary but would be consistent with the G5 star being the outer, third component of this triple system.

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