Discovery of three new RS Canum Venaticorum-like counterparts to HEAO I X-ray sources

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165132· OSTI ID:6270669

Buckley, D A.H.; Tuohy, I R; Remillard, R A; Bradt, H V; Schwartz, D A

The identification of three high-latitude HEAO I Scanning Modulation Collimator X-ray sources with the chromospherically active RS CVn-like stars HD 113816, HD 146413, and HD 39576 is reported. Optical observations, including coude spectroscopy and broad-band and narrow band photoelectric photometry are presented. The Ca II emission strength of all three stars shows that they are chromospherically active. HD 146413 and HD 39576 exhibit variable X-ray emission in the 1-13 keV energy range, while HD 113816 is a softer and steadier source. The level of X-ray flux detected from these three stars is some one to two orders of magnitude higher than predicted empirically from the Ca II emission fluxes. It is proposed that this emission results from flarelike activity. 106 references.

• Research Organization: Mount Stromlo and Siding Spring Observatories, Canberra, Australia; MIT, Cambridge, MA; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA
• OSTI ID: 6270669
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 315; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BINARY STARS
CHROMOSPHERE
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
IONIZING RADIATIONS
MATHEMATICAL MODELS
RADIAL VELOCITY
RADIATIONS
SOLAR ATMOSPHERE
SPECTRA
STAR MODELS
STARS
STELLAR ACTIVITY
VARIABLE STARS
VARIATIONS
VELOCITY
X RADIATION