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J/ApJ/437/361       Einstein survey of the Orion nebula region (Gagne+ 1994)

The complete Einstein Observatory X-ray survey of the Orion nebula region. Gagne M., Caillault J.-P. <Astrophys. J. 437, 361 (1994)> =1994ApJ...437..361G (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Nebulae Mission_Name: Einstein Keywords: stars; pre-main sequence - X-rays: stars Description: We have analyzed archival Einstein Observatory images of a roughly 4.5 square degree region centered on the Orion Nebula. In all, 245 distinct X-ray sources have been detected in six High Resolution Imager (HRI) and 17 Imaging Proportional Counter (IPC) observations. An optical database of over 2700 stars has been assembled to search for candidate counterparts to the X-ray sources. Roughly half the X-ray sources are identified with a single Orion Nebula cluster member. The 10 main-sequence O6-B5 cluster stars detected in Orion have X-ray activity levels comparable to field O and B stars. X-ray emission has also been detected in the direction of four main-sequence late-B and early-A type stars. Since the mechanisms producing X-rays in late-type coronae and early-type winds cannot operate in the late-B and early-A type atmospheres, we argue that the observed X-rays, with LX∼3x1030ergs/s, are probably produced in the coronae of unseen late-type binary companions. Over 100 X-ray sources have been associated with late-type pre-main sequence stars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 96 245 Sources detected in the Orion Nebula Region by Einstein table3.dat 57 44 Einstein sources with multiple optical counterparts table6.dat 76 71 Optical and X-ray data for typed cluster members table7.dat 59 51 Optical and X-ray data for untyped cluster members table8.dat 58 31 Rotational and X-ray data for late-type cluster members notes.dat 104 30 Notes to tables 6 and 7 tables.tex 237 577 LaTeX version of the tables
See also: II/171 : Parenago Catalogue of stars in Orion Nebula area (1954) II/36 : Photometry of Orion OB1 Association (Warren+ 1977) J/ApJ/445/280 : ROSAT survey of the Orion nebula region (Gagne+ 1995) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NoX X-ray number 5- 6 I2 h RAh Right ascension (B1950) of the source 8- 9 I2 min RAm Right ascension (B1950) of the source 11- 14 F4.1 s RAs Right ascension (B1950) of the source 16 A1 --- DE- Declination sign 17 I1 deg DEd Declination (B1950) of the source 19- 20 I2 arcmin DEm Declination (B1950) of the source 22- 23 I2 arcsec DEs Declination (B1950) of the source 25- 31 F7.5 ct/s Rate1 ? IPC count rate 33- 39 F7.5 ct/s e_Rate1 ? rms uncertainty on Rate1 41- 47 F7.5 ct/s Rate2 ? HRI count rate 49- 55 F7.5 ct/s e_Rate2 ? rms uncertainty on Rate2 57- 59 I3 arcsec DRA ? Offset in right ascension 61- 63 I3 arcsec DDE ? Offset in declination 65- 71 A7 --- Name Star name 72 A1 --- n_Name [*] * indicates multiple optical counterpart. See table3 74- 75 I2 --- Prob ? Membership probability
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NoX X-ray number 5- 7 I3 arcsec oRA1 Offset in right ascension for star1 9- 11 I3 arcsec oDE1 Offset in declination for star1 13- 18 A6 --- Star1 Star1 name 20- 21 I2 --- Prob1 ? Membership probability for star1 23- 25 I3 arcsec oRA2 Offset in right ascension for star2 27- 29 I3 arcsec oDE2 Offset in declination for star2 31- 35 A5 --- Star2 Star2 name 37- 38 I2 --- Prob2 ? Membership probability for star2 40- 42 I3 arcsec oRA3 ? Offset in right ascension for star3 44- 46 I3 arcsec oDE3 ? Offset in declination for star3 48- 52 A5 --- Star3 Star3 name 54- 55 I2 --- Prob3 ? Membership probability for star3
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NoX X-ray number 5- 9 A5 --- Par Parenago (1954, Cat.II/171) designation 11- 16 A6 --- J+W Jones & Walker (1988) designation 18- 24 A7 --- GCVS GCVS designation 26- 34 A9 --- Sp Spectral type 36- 40 F5.3 [K] logTeff Effective temperature 42- 46 F5.2 mag Bmag ? B magnitude 48- 52 F5.2 mag Vmag ? V magnitude 54- 58 F5.2 mag Icmag ? Ic magnitude 60- 64 F5.2 [10-7W] logLX X-ray luminosity 66- 70 F5.2 --- log(LX/Lbol) ? X-ray luminosity versus bolometric luminosity ratio 72- 76 A5 --- Note Individual Notes (file notes.dat)
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NoX X-ray number 5- 9 A5 --- Par Parenago (1954, Cat.II/171) designation 11- 16 A6 --- J+W Jones & Walker (1988) designation 18- 23 A6 --- GCVS GCVS designation 24- 28 F5.2 mag Bmag ? B magnitude 30- 34 F5.2 mag Vmag ? V magnitude 36- 40 F5.2 mag Icmag ? Ic magnitude 42- 46 F5.2 [10-7W] logLX X-ray luminosity 47 A1 --- n_logLX [b] Note on LX (1) 49- 53 F5.2 --- log(fX/fbol) ? X-ray flux versus bolometric flux ratio 55- 59 A5 --- Note Individual Notes (file notes.dat)
Note (1): JW 315 may have been flaring during HRI exposure (see table2). Consequently, we have used IPC count rate to determine LX.
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 3 I3 --- NoX X-ray number 5- 9 A5 --- Par Parenago (1954, Cat.II/171) designation 11- 16 A6 --- J+W Jones & Walker (1988AJ.....95.1755J) designation 18- 21 A4 --- GCVS GCVS designation 23- 29 A7 --- Sp Spectral type 31- 35 F5.2 [10-7W] logLX X-ray luminosity 37- 40 F4.2 [mW/m2] logFX X-ray flux 41 A1 --- u_logFX Uncertainty flag on logFX 43 A1 --- l_vsini Limit flag on vsini 44- 46 I3 km/s vsini ? Rotational velocity 48- 52 F5.2 d Prot ? Period of rotation 54- 55 A2 --- Note Individual Notes (1)
Note (1): a: Rotational period from Attridge & Herbst 1994 b: Rotational period from Attridge & Herbst 1992ApJ...398L..61A c: Rotational period from Mandel & Herbest 1991ApJ...383L..75M d: Rotational period from Walker 1990PASP..102..726W e: Spectroscopic rotational velocity from Strom 1994ApJ...424..237S f: Spectroscopic rotational velocity from Duncan 1993ApJ...406..172D g: Spectroscopic rotational velocity from Walker 1990PASP..102..726W h: Spectroscopic rotational velocity from Hartmann et al. 1986ApJ...309..275H i: Spectroscopic rotational velocity from Smith et al. 1983ApJ...271..237S
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1 A1 --- Note Note symbol (tables 6 and 7) 3-104 A102 --- Text Text of note (includes the bibcode)
Courtesy: Marc Gagne History: * 07-Nov-2000: table2 has position in B1950, not in J2000. References: Abt et al. 1991 ApJ 367, 155 =1991ApJ...367..155A Andrews 1981 "A Photometric atlas of the Orion Nebula" (Belfast: Armagh Obs. Press) Attridge & Herbst 1992 ApJ 398, L61 =1992ApJ...398L..61A Attridge & Herbst 1994, in prep. Brun 1935 Pub. Obs. Lyon, 1, No 12 =1935POLyo...1...12B Cohen & Kuhi 1979 ApJS 41, 743 =1979ApJS...41..743C Duncan 1993 ApJ 406, 172 =1993ApJ...406..172D Edwards et al. 1993 AJ 106, 372 =1993AJ....106..372E General Catalogue of Variable Stars =CDS Catalogue: II/139 Hartmann et al. 1986 ApJ 309, 275 =1986ApJ...309..275H Herbig & Terndrup 1986 ApJ 307, 609 =1986ApJ...307..609H Herbst (1993) private comm. Jones & Walker 1988 AJ 95, 1755 =1988AJ.....95.1755J Mandel & Herbst 1991 ApJ 383, L75 =1991ApJ...383L..75M McNamara & Huels 1983 A&AS 54, 221 =1983A&AS...54..221M McNamara et al. 1989 AJ 97, 1427 =1989AJ.....97.1427M Parenago 1954 =CDS Catalogue: II/171 Parsamian & Chavira 1982 Bol. Inst. Tonantzintla 3, 69 =1982BITon...3...69P Rydgren & Vrba 1984 AJ 89, 399 =1984AJ.....89..399R Smith et al. 1983 ApJ 271, 237 =1983ApJ...271..237S Smith et al. 1983 ApJ 272, 163 =1983ApJ...272..163S Strom 1993 private comm. Strom 1994 ApJ 424, 237 =1994ApJ...424..237S Strom et al. 1990 ApJ 362, 168 =1990ApJ...362..168S van Altena et al. 1988 AJ 95, 1744 =1988AJ.....95.1744V Walker 1969 ApJ 155, 447 =1969ApJ...155..447W Walker 1983 ApJ 271, 642 =1983ApJ...271..642W Walker 1990 PASP 102, 726 =1990PASP..102..726W Warren & Hesser 1977 ApJS 34, 115 =CDS Catalogue: II/36
(End) Patricia Bauer [CDS] 14-Aug-1996
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

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