1998A&AS..127..505B


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.26CET03:07:21

1998A&AS..127..505B - Astron. Astrophys., Suppl. Ser., 127, 505-519 (1998/February-1)

The photosphere and chromosphere of the RS Canum Venaticorum star, II Pegasi. II. A multi-wavelength campaign in August/September 1992.

BYRNE P.B., ABDUL-AZIZ H., AMADO P.J., AREVALO M.J., AVGOLOUPIS S., DOYLE J.G., EIBE M.T., ELLIOTT K.H., JEFFRIES R.D., LANZAFAME A.C., LAZARO C., MURPHY H.M., NEFF J.E., PANOV K.P., SARRO L.M., SEIRADAKIS J.H. and SPENCER R.E.

Abstract (from CDS):

We describe multi-wavelength, simultaneous observations of the RS CVn star, II Pegasi, most of which were obtained during the first three weeks of September 1992. These observations were made using optical and infra-red broad-band photometry, ultraviolet and optical spectroscopy and microwave monitoring. We have detected photospheric spots and chromospheric flares, as well as deriving a description of mean conditions in the quiet chromosphere. One of the flares, observed in optical photometry and ultraviolet spectroscopy is one of the most energetic ever observed on this star. We demonstrate that in its ``quiescent'' state II Peg is continually variable in most of its chromospheric emissions, as well as in its coronal output.

Abstract Copyright:

Journal keyword(s): stars: late-type - activity - chromosphere - II Peg - radio continuum: stars

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 224016 PM* 23 54 29.6898756218 +29 38 17.673806459       8.0   G5 18 0
2 HD 224084 * 23 55 01.3417730623 +29 27 01.769527270   9.48 8.23     K0 18 0
3 HD 224085 RS* 23 55 04.0516465022 +28 38 01.248194500 8.88 8.20   6.9   K2+IVeFe-1 675 0

    Equat.    Gal    SGal    Ecl

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2020.02.26-03:07:21

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