Multiwavelength observations of two moderate rotation RS CVn systems

V815 Herculis and IM Pegasi

Robert C. Dempsey, James E. Neff, Douglas O'Neal, K. Oláh

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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
Volume111
Issue number3
DOIs
Publication statusPublished - Mar 1996

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photometry
chromosphere
ultraviolet spectroscopy
photosphere
inhomogeneity
radial velocity
temperature
spectroscopy
probe
wavelength
cycles
probes
estimates
wavelengths
indicator

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Multiwavelength observations of two moderate rotation RS CVn systems : V815 Herculis and IM Pegasi. / Dempsey, Robert C.; Neff, James E.; O'Neal, Douglas; Oláh, K.

In: Astronomical Journal, Vol. 111, No. 3, 03.1996, p. 1356-1367.

Research output: Contribution to journalArticle

Dempsey, Robert C. ; Neff, James E. ; O'Neal, Douglas ; Oláh, K. / Multiwavelength observations of two moderate rotation RS CVn systems : V815 Herculis and IM Pegasi. In: Astronomical Journal. 1996 ; Vol. 111, No. 3. pp. 1356-1367.
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