J/AJ/126/1996 100 brightest X-ray stars within 50pc of the Sun (Makarov+, 2003)
The 100 brightest X-ray stars within 50 parsecs of the Sun.
Makarov V.V.
<Astron. J., 126, 1996-2008 (2003)>
=2003AJ....126.1996M 2003AJ....126.1996M
ADC_Keywords: X-ray sources ; Stars, bright ; Stars, nearby ; Space velocities
Keywords: binaries: general - stars: activity - stars: kinematics -
stars: statistics - X-rays
Abstract:
Based on the Hipparcos and Tycho-2 astrometric catalogs and the ROSAT
surveys, a sample of ∼100 stars most luminous in X-rays within or
around a distance of 50 pc is culled. The smallest X-ray luminosity in
the sample is LX=9.8x1029erg/s; the strongest source in the solar
neighborhood is II Peg, a RS CVn star, at LX=175.8x1029erg/s. With
respect to the origin of X-ray emission, the sample is divided into
partly overlapping classes of pre-main-sequence, post-T Tauri, and
very young ZAMS objects (type XY), RS CVn-type binary stars (type RS),
other active short-period binaries, including binary BY Dra-type
objects (type XO), apparently single or long-period binary active
evolved stars (type XG), contact binaries of WU UMa kind (type WU),
apparently single or long-period binary variable stars of BY Dra kind
(type BY), and objects of unknown nature (type X?). Chromospherically
active, short-period binaries (RS and XO) make up 40% of the brightest
X-ray emitters, followed by young stars (XY) at 30% and unknown
sources (X?) at 15%.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 139 101 The 101 Brightest X-Ray Stars within 50 Parsecs
table4.dat 39 69 Kinematics of nearby X-ray stars
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)
J/A+AS/135/319 : ROSAT data of Nearby Stars (Huensch+ 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- 1RXS ROSAT name (JHHMMSS.s+DDMMSS)
18- 23 I6 --- HIP Hipparcos number
25- 30 I6 --- HD ? HD number
32- 44 A13 --- Name Alternative name
46- 52 A7 --- AType Type of activity (G1)
54- 74 A21 --- SpType Spectral type and class
76- 80 F5.2 mag Vmag Hipparcos V-band magnitude
82- 86 F5.2 mag B-V Hipparcos (B-V) color
88- 91 F4.1 mas plx Hipparcos parallax
93- 95 F3.1 mas e_plx Formal standard error in plx
97-102 F6.2 10+22W LX X-ray luminosity in units of 1029ergs/s
104-108 F5.2 --- HR1 ROSAT hardness ratio
110-118 A9 --- BType Type of binarity (2)
120-125 F6.1 mas/yr pmRA Right ascension component of proper motion
127-132 F6.1 mas/yr pmDE Declination component of proper motion
134-138 F5.1 km/s RV ? Radial velocity
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Note (2): Type of binarity is coded as follows:
SB = Spectroscopic binary;
O = Astrometric binary with orbital solution;
A = Other astrometric binary;
E = Eclipsing binary;
V = Resolved visual.
Uncertain entries are marked with a colon
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- AType Type of activity (G1)
4- 9 I6 --- HIP Hipparcos number
12- 16 F5.1 km/s Uvel U velocity
20- 24 F5.1 km/s Vvel V velocity
28- 32 F5.1 km/s Wvel W velocity
35- 39 F5.1 km/s Vlsr LSR velocity
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Global Notes:
Note (G1): Type of activity is coded as follows:
RS = RS CVn type star;
XO = Other type of short-period active binary;
XG = Active evolved star without spectroscopic binarity;
XY = Young star;
BY = Apparently single BY Draconis type variable star;
WU = WU UMa type binary;
X? = Unknown type.
Uncertain entries are marked with a colon.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 02-Dec-2003