Multiwavelength observations of two moderate rotation RS CVn systems: V815 Herculis and IM Pegasi

Robert C. Dempsey, James E. Neff, Douglas O'Neal, Katalin Olah

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Near-to-simultaneous ultraviolet and visual spectroscopy of two moderate v sin i RS CVn systems, V815 Herculis (v sin i=27 kms-1) and IM Pegasi (v sin i=24 kms-1), are presented along with contemporaneous UBV(RI)c photometry. These data were used to probe inhomogeneities in the chromospheres and photospheres, and the possible relationship between them. Variability is observed at all wavelengths, some indicators showing rotationally modulated fluctuations. We use UBVRI photometry and TiO spectra to estimate temperatures, area, and locations of photospheric spots on IM Peg. Evidence is presented that the spot temperature in IM Peg has changed over a possible solar-like spot cycle. Radial velocities of V815 Her indicates that the system is actually triple.

Original languageEnglish
Pages (from-to)1356-1367
Number of pages12
JournalAstronomical Journal
Issue number3
Publication statusPublished - Mar 1 1996


ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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