Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasp..107.1034s&link_type=abstract
Publications of the Astronomical Society of the Pacific, v.107, p.1034
Astronomy and Astrophysics
Astronomy
47
X-Rays: Stars, Stars: Rotation, Kinematics And Dynamics
Scientific paper
From X-ray images in the ROSAT public archives, we determine soft X-ray fluxes, or flux upper limits, for 74 A-type stars, which have been observed during deep integrations with the PSPC. Nine supposedly single, late A stars (0.20 < B-V < 0.35) are found to coincide with X-ray sources. The X-ray luminosities we infer for these stars range from levels comparable to the Active Sun, at log L_x ~27.6, to much brighter emission levels similar to those observed for active late-type binary systems, near log L_x ~30.1. Another 10 sources are identified with early A stars (0.0 < B-V < 0.2). Five of these are confirmed double stars, the rest are ostensibly single. The maximum luminosity we detect in the early A stars, log L_x = 30.1, is 3.5 orders of magnitude brighter than the X-ray upper limits for the nondetected stars. Additional study, including radial velocity monitoring and/or optical interferometry, will be needed to determine whether the putatively single X-ray emitting stars are in fact single, or whether their emission is produced entirely or in part by unknown or unresolved binary companions. The level of X-ray emission associated with chemically normal, single A stars thus far appears to be uncorrelated with any obvious stellar property, including the rotation rate, which is known to greatly influence the dynamo activity and the X-ray emission levels of lower mass stars. (SECTION: Stars)
Drake Stephen Alan
Kim Philip D.
Simon Theodore
No associations
LandOfFree
The X-Ray Emission of A-Type Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The X-Ray Emission of A-Type Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The X-Ray Emission of A-Type Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1182095