Discovery of three new RS Canum Venaticorum-like counterparts to HEAO I X-ray sources
1987; IOP Publishing; Volume: 315; Linguagem: Inglês
10.1086/165132
ISSN1538-4357
AutoresD. A. H. Buckley, I. R. Tuohy, R. A. Remillard, H. Bradt, D. A. Schwartz,
Tópico(s)Astronomical Observations and Instrumentation
Resumoview Abstract Citations (12) References (96) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discovery of Three New RS Canum Venaticorum--like Counterparts to HEAO 1 X-Ray Sources Buckley, D. A. H. ; Tuohy, I. R. ; Remillard, R. A. ; Bradt, H. V. ; Schwartz, D. A. Abstract The authors report the identification of three high galactic latitude X-ray sources, detected by the HEAO 1 MC experiment, with the bright stars HD 113816, HD 146413 (= ADS 9982) and HD 39576. The authors have found all three stars to be chromospherically active by virtue of their Ca II emission strength. The latter two stars exhibit variable X-ray emission in the 1 - 13 keV energy range, while HD 113816 is a softer (0.9 - 2.5 keV) and steadier source. The optical spectroscopic observations reveal small radial velocity variations over months for HD 113816 and insignificant variations for HD 146413. 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 the X-ray emission results from flarelike activity. Publication: The Astrophysical Journal Pub Date: April 1987 DOI: 10.1086/165132 Bibcode: 1987ApJ...315..273B Keywords: Emission Spectra; Heao 1; Stellar Activity; X Ray Binaries; Chromosphere; Radial Velocity; Stellar Luminosity; Stellar Models; Stellar Spectra; Variable Stars; Astrophysics; CA II EMISSION; STARS: BINARIES; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 39576; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 113816; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 146413; X-RAYS: BINARIES full text sources ADS | data products SIMBAD (9)
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