J/AJ/127/477 Hard X-ray emissions of white dwarfs (Chu+, 2004)
Hard X-ray emission associated with white dwarfs. II.
Chu Y.-H., Guerrero M.A., Gruendl R.A., Webbink R.F.
<Astron. J., 127, 477-480 (2004)>
=2004AJ....127..477C 2004AJ....127..477C
ADC_Keywords: Stars, white dwarf ; X-ray sources
Keywords: binaries: general - stars: coronae - stars: late-type - white dwarfs -
X-rays
Abstract:
We have previously conducted a search for X-ray sources coincident
with white dwarfs using the white dwarf catalog compiled by McCook &
Sion (1999, Cat. III/210, III/235) and the ROSAT sources in the
WGA (IX/31) Catalog (Paper I, O'Dwyer et al., 2003AJ....125.2239O 2003AJ....125.2239O).
To include the white dwarfs discovered since 1999 and to include the
X-ray sources detected in ROSAT Position Sensitive Proportional
Counter (PSPC, IX/30) 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 58 White dwarfs coincident with ROSAT PSPC X-ray sources
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See also:
IX/31 : The WGACAT version of ROSAT sources (White+ 2000)
IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)
IX/38 : ROSAT Sources for the PSPC with filter (2RXF) (ROSAT Team, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WD White dwarf designation
12- 18 A7 --- WDType White dwarf type
20- 40 A21 --- Name Common name
41- 61 A21 --- ROSAT ROSAT PSPC source number
63- 68 I6 --- ObsNo ROSAT observation number
70- 73 F4.1 ks ExpTime Exposition time
75- 78 A4 --- Com1 Comment (1)
79 A1 -- --- [,]
81 A1 --- Com2 [S?] S: detected in the soft 0.1-0.4keV band
82 A1 -- --- [,]
84 A1 --- Com3 [H?] H: detected in the hard 0.9-2.0keV band
86- 89 I4 ct Scount 0.10-0.40keV X-ray counts reported in 2RXP/2 RXF
91- 92 I2 ct e_Scount rms uncertainty on Scount
94- 96 I3 ct Mcount 0.41-0.90keV X-ray counts reported in 2RXP/2 RXF
98- 99 I2 ct e_Mcount rms uncertainty on Mcount
101 A1 --- l_Hcount [~] Limit flag on Hcount
102-104 I3 ct Hcount 0.10-0.40keV X-ray counts reported in 2RXP/2 RXF
106-107 I2 ct e_Hcount rms uncertainty on Hcount
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Note (1): Comments as follows:
Good = convincing coincidence
U1 = the white dwarf is outside the point-spread function of the
X-ray source or the X-ray source is centered closer to a bright
star whose spectral type is commonly associated with coronal activity
U2 = the X-ray source is just a weak peak on a bright background
and thus the source identification is ambiguous
U3 = a large number of candidates for optical counterpart are present
within the PSPC's point-spread function
U4 = the X-ray source is too faint to be credible
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History:
From electronic version of the journal
References:
O'Dwyer et al., Paper I 2003AJ....125.2239O 2003AJ....125.2239O
(End) James Marcout, Patricia Vannier [CDS] 06-Apr-2004