X-rays from Hot Subdwarfs

Abstract

Thanks to the high sensitivity of the instruments on board the XMM-Newton and Chandra satellites, it has become possible to explore the properties of the X-ray emission from hot subdwarfs. The small but growing sample of hot subdwarfs detected in X-rays includes binary systems, in which the X-rays result from wind accretion onto a compact companion (white dwarf or neutron star), as well as isolated sdO stars in which X-rays are probably due to shock instabilities in the wind. X-ray observations of these low mass stars provide information which can be useful also for our understanding of the winds of more luminous and massive early-type stars and can lead to the discovery of particularly interesting binary systems.

Review paper to be published in Advances in Space Research (special issue on "X-ray emission from hot stars and their winds")

References in corpus (9)

• An ultra-massive fast-spinning white dwarf in a peculiar binary system
• Mass-loss and diffusion in subdwarf B stars and hot white dwarfs: do weak winds exist?
• A NLTE analysis of the hot subdwarf O star BD+28 4211. II. The optical spectrum
• Three new X-ray emitting sdO stars discovered with Chandra
• Is the X-ray pulsating companion of HD 49798 a possible type Ia supernova progenitor?
• Constraints on the winds of hot subdwarf stars from X-ray observations of two sdB binaries with compact companions: CD -30 11223 and PG 1232-136
• Follow-up observations of X-ray emitting hot subdwarf star: the He-rich sdO BD +37° 1977
• NLTE wind models of hot subdwarf stars
• Stellar wind signatures in sdB stars?

Cited by in corpus (7)

• The first ultracompact Roche lobe-filling hot subdwarf binary
• The OmegaWhite survey for short-period variable stars - V. Discovery of an ultracompact hot subdwarf binary with a compact companion in a 44 minute orbit
• The X-ray emission of Be+stripped star binaries
• New X-ray observations of the hot subdwarf binary HD49798 / RXJ0648.0-4418
• Hot subdwarf wind models with accurate abundances I. Hydrogen dominated stars HD 49798 and BD+18${}^{\circ }$2647
• The lack of X-ray pulsations in the extreme helium star BD+37${}^{\circ }$442 and its possible stellar wind X-ray emission
• Chandra's X-ray study confirms that the magnetic standard Ap star KQ Vel hosts a neutron star companion