SIMBAD references

2004AJ....127..477C - Astron. J., 127, 477-480 (2004/January-0)

Hard X-ray emission associated with white dwarfs. II.


Abstract (from CDS):

We have previously conducted a search for X-ray sources coincident with white dwarfs using the white dwarf catalog compiled by McCook & Sion and the ROSAT sources in the WGA Catalog (Paper I). To include the white dwarfs discovered since 1999 and to include the X-ray sources detected in ROSAT Position Sensitive Proportional Counter (PSPC) observations made with a boron filter, we have carried out another search using an updated list of white dwarfs and the final catalogs of the ROSAT PSPC observations with and without a boron filter. Forty-seven new X-ray sources convincingly coincident with white dwarfs are found and reported in this paper. Among these, only five show hard X-ray emission: three possess confirmed or suggested late-type companions, one is apparently single, and the other is likely a misclassified BL Lac object. The apparently single white dwarf with hard X-ray emission, KPD 0005+5106, was discussed extensively in Paper I. Photospheric origin for the hard X-ray emission from hot DO and DQZO white dwarfs remains a tantalizing possibility, but high-quality near-IR spectroscopic observations and monitoring of the Hα emission line are needed to rule out the existence of a faint dMe companion.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: General - Stars: Coronae - Stars: Late-Type - Stars: White Dwarfs - X-Rays

VizieR on-line data: <Available at CDS (J/AJ/127/477): table1.dat>

Nomenclature: Table 1: 2RXF JHHMMSS.s+DDMMSS N=22.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 67

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