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J/ApJS/102/75 ROSAT Observations of the Pleiades (Micela+ 1996)
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ROSAT Observations of the Pleiades. I. X-Ray Characteristics of a Coeval
Stellar Population
Micela G., Sciortino S., Kashyap V., Harnden F.R., Rosner R.
<Astrophys. J. Suppl. 102, 75 (1996)>
=1996ApJS..102...75M
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ADC_Keywords: Clusters, open; X-ray sources; Rotational velocities
Abstract:
Of 214 stars in the core of the Pleiades, 99 were detected in X-rays
with the ROSAT PSPC. This catalog lists the characteristics of the
stars taken from the literature, in table1.dat and the rotational and
X-ray characteristics in table5.dat.
Introduction:
The nucleus of the composite catalog used in this study is the catalog
compiled from the published literature for the Einstein investigations
of the Pleiades (Micela et al. 1990). This list has been extended by
the results of recent surveys to a completeness limit of visual
magnitude about 18.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 214 Basic data
table5.dat 68 214 Rotation and X-ray characteristics
refs.dat 80 44 References
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See also:
I/90 : Positions of 502 Stars in Pleiades Region (Eichhorn+ 1970)
I/163 : US Naval Observatory Pleiades Catalog (Van Flandern 1969)
J/A+A/341/751 : ROSAT HRI observations of the Pleiades (Micela+ 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Micela number
5-11 A7 --- name Name
13-14 I2 h RAh Right Ascension hours (J2000)
16-17 I2 min RAm Right Ascension minutes (J2000)
19-22 F4.1 s RAs Right Ascension seconds (J2000)
23 A1 --- DE- Declination sign (J2000)
24-25 I2 deg DEd Declination degrees (J2000)
27-28 I2 arcmin DEm Declination minutes (J2000)
30-33 F4.1 arcsec DEs Declination seconds (J2000)
35-39 F5.2 mag Vmag ? V magnitude
41-42 I2 --- r_Vmag ? Reference for Vmag
44-47 F4.2 mag B-V ? B-V color
49-54 A6 --- Sp Spectral type
55-56 I2 --- r_Sp ? Reference for spectral type
57 A1 --- l_vsini < indicates upper limit for vsin(i)
58-60 I3 km/s vsini *? Rotation velocity * sin(inclination)
62-72 A11 --- rem Notes
73-75 A3 --- r_vsini Reference
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Note on vsini:
From Soderblom et al. (1993ApJS...85..315S; Cat. <J/ApJS/85/315>)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Micela number
4 A1 --- rem [*] "*" indicates E(B-V) > 0.1
5-12 A8 --- name Name
13-17 F5.1 arcsec oRA *? Difference in right ascension
19-24 F6.1 arcsec oDE *? Difference in declination
26-29 F4.1 arcmin off_axis *Off axis value
31 A1 --- l_CtRate < indicates upper limit for CtRate
32-37 F6.2 ct/ks CtRate Count rate
39-43 F5.2 --- S/N ? Signal/noise ratio
45-48 F4.2 --- HR *? Hardness ratio
50-53 F4.2 --- e_HR ? Mean error on HR
55-58 F4.2 10-14W/ct cecf Counts-to-energy conversion factor
60 A1 --- l_log_Lx < indicates upper limit for log(Lx)
61-65 F5.2 [10-7W] log_Lx *? Log of X-ray luminosity
67-68 I2 --- mcpt *? Multiple counterparts
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Note on oRA and oDE:
The difference between the position derived from the ROSAT image and
the catalog position of the suggested identification for sources not
in complexes of overlapping sources.
Note on off_axis:
The spatial resolution of ROSAT degrades with distance from the axis.
The accuracy radius for identification is taken as 30" sources within
20' of the axis and 60" for sources between 30' and 50'. Sources
beyond 50' from the axis were not included.
Note on HR:
HR = (counts(0.2-0.9 keV))/(counts(0.9-2.01 keV))
Note on log_Lx:
Computed for assumed distance of 127 pc.
Note on mcpt:
Numbers indicate sources identified with more than one star or un
complexes of overlapping sources. Stars with the same number are
identified with the same X-ray source.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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2- 3 I2 --- RefNo [1,22]+= Reference number
5- 80 A76 --- Text Text of reference, starting by the bibcode
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History:
The units of oRA, in table 5, were corrected in arcsec on 30-Apr-2002
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(End) N. G. Roman [ADC/SSDOO] 21-Feb-1997, rev. F. Ochsenbein [CDS] 18-Jul-1998