Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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 pmRA Right ascension component of proper motion 127-132 F6.1 mas pmDE Declination component of proper motion 134-138 F5.1 km/s RV ? Radial velocity
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
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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
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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service