Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436..807d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 436, no. 2, p. 807-817
Astronomy and Astrophysics
Astronomy
41
A Stars, B Stars, Emission Spectra, Pre-Main Sequence Stars, Stellar Luminosity, Stellar Spectra, X Ray Astronomy, X Ray Spectra, Astronomical Spectroscopy, Heao 2, Line Spectra, Maximum Likelihood Estimates, Proportional Counters, Stellar Models, Stellar Structure
Scientific paper
We have investigated the X-ray emission from Herbig Ae/Be stars, using the full set of Einstein Imaging Proportional Counter (IPC) observations. Of a total of 31 observed Herbig stars, 11 are confidently identified with X-ray sources, with four additonal dubious identifications. We have used maximum likelihood luminosity functions to study the distribution of X-ray luminosity, and we find that Be stars are significantly brighter in X-rays than Ae stars and that their X-ray luminosity is independent of projected rotational velocity v sin i. The X-ray emission is instead correlated with stellar bolometric luminosity and with effective temperature, and also with the kinetic luminosity of the stellar wind. These results seem to exclude a solar-like origin for the X-ray emission, a possibility suggested by the most recent models of Herbig stars' structure, and suggest an analogy with the X-ray emission of O (and early B) stars. We also observe correlations between X-ray luminosity and the emission at 2.2 microns (K band) and 25 microns, which strengthen the case for X-ray emission of Herbig stars originating in their circumstellar envelopes.
Damiani Ferruccio
Harnden Frank R. Jr.
Micela Giuseppina
Sciortino Salvatore
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