J/ApJ/445/280 ROSAT survey of the Orion nebula region (Gagne+ 1995) ================================================================================ Deep ROSAT HRI observations of the Orion nebula region. Gagne M., Caillault J.-P., Stauffer J.R. =1995ApJ...445..280G (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: X-ray sources ; Nebulae Mission_Name: ROSAT Keywords: ISM: individual (Orion Nebula) - star: pre-main-sequence - X-rays: stars Description: We present results from three deep ROSAT high-resolution imager observations of the Orion Nebula star-forming region. The X-ray images contain over 1500 catalogued stars in a roughly 0.8deg^2^ region centered on the Trapezium. In all, 389 distinct X-ray sources have been detected, at least two-thirds of which are associated with a single proper-motion cluster member. X-ray emission is detected from stars of all spectral types, from the massive O- and B-type components of the Trapezium to the coolest, low-mass pre-main-sequence (PMS) stars. In this paper, we focus primarily on X-ray emission from the late-type PMS stars. Of the ~100 late-type cluster members with measured spectral types, approximately three-fourths have been detected; we have derived X-ray luminosity upper limits for the remaining stars. We found coronal X-ray emission turns on around spectral type F6, with the upper envelope of activity increasing with decreasing effective temperature. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2 68 389 Orion Nebula X-ray sources table2.tex 194 439 LaTeX version of table2 table3 72 50 X-ray sources with multiple candidate optical counterparts table3.tex 229 93 LaTeX version of table3 table6 85 175 Optical and X-ray data for Group 1 stars table6.tex 192 257 LaTeX version of table6 -------------------------------------------------------------------------------- See also: II/171 : Parenago catalogue in the area of the Orion nebula (1954) II/36 : UBV & uvby-beta obs. of Orion OB1 Association (Warren+ 1977) J/ApJ/437/361 : Einstein survey of the Orion nebula region (Gagne+ 1994) Byte-by-byte Description of file: table2 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- NoX [1/389]+ X-ray number 5- 6 I2 h RAh Right ascension J2000 8- 9 I2 min RAm Right ascension J2000 11- 14 F4.1 s RAs Right ascension J2000 16 A1 --- DE- Declination sign 17 I1 deg DEd Declination J2000 19- 20 I2 arcmin DEm Declination J2000 22- 23 I2 arcsec DEs Declination J2000 25- 31 F7.5 ct/s Count Corrected ROSAT HRI count rate 33- 39 F7.5 ct/s e_Count rms uncertainty on Count 40 A1 --- Mult [*] * indicates multiple candidate optical counterparts. See table3 41- 45 A5 --- Par Parenago (1954) optical counterpart candidate designation 48- 52 A5 --- J&W Jones & Walker (1988) optical counterpart candidate designation 54- 58 A5 --- Var Variable optical counterpart candidate designation 60- 61 I2 --- Prob ? Membership probability 63- 64 I2 arcsec DRA ? Offset in right ascension 66- 67 I2 arcsec DDE ? Offset in declination -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- NoX [1/389]+ X-ray number 5- 9 A5 --- Par1 Parenago designation of the first candidate 11- 16 A6 --- J&W1 Jones & Walker (1988) name of the first candidate 18- 19 I2 --- Prob1 ? Membership probability of the first candidate 21- 22 I2 arcsec DRA1 Offset in right ascension of the first candidate 24- 25 I2 arcsec DDE1 Offset in declination of the first candidate 28- 32 A5 --- Par2 Parenago designation of the second candidate 34- 39 A6 --- J&W2 Jones & Walker (1988) name of the second candidate 41- 42 I2 --- Prob2 ? Membership probability of the second candidate 44- 45 I2 arcsec DRA2 Offset in right ascension of the second candidate 47- 48 I2 arcsec DDE2 Offset in declination of the second candidate 50- 54 A5 --- Par3 Parenago designation of the third third candidate 56- 61 A6 --- J&W3 Jones & Walker (1988) name of the third candidate 63- 64 I2 --- Prob3 ? Membership probability of the third candidate 66- 67 I2 arcsec DRA3 ? Offset in right ascension of the third candidate 69- 70 I2 arcsec DDE3 ? Offset in declination of the first candidate -------------------------------------------------------------------------------- Byte-by-byte Description of file: table6 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 A5 --- Name Star name 7- 9 I3 --- NoX [1/389]? X-ray number 11- 19 A9 --- Sp Spectral type 21- 25 F5.3 K logTeff ? Effective temperature 26 A1 --- u_logTeff Uncertainty flag on logTeff 28- 32 F5.2 mag Bmag ? B magnitude 34- 38 F5.2 mag Vmag ? V magnitude 40- 44 F5.2 mag Icmag ? Ic (Cousins system) magnitude 46- 49 F4.2 mag AV Visual extinction (1) 50 A1 --- n_AV [)] ')' when AV=0.25mag (1) 52 A1 --- l_vsini Limit flag on vsini 53- 55 I3 km/s vsini ? Spectroscopic rotation velocity 57- 61 F5.2 d Prot ? Rotational period 63 A1 --- l_logLX Limit flag on logLX 64- 68 F5.2 10-7J logLX X-ray luminosity 70 A1 --- l_logLX/Lbol Limit flag on logLX/Lbol 71- 75 F5.2 --- logLX/Lbol ? X-ray luminosity versus bolometric luminosity 76 A1 --- u_logLX/Lbol Uncertainty flag on logLX/Lbol 78- 84 A7 --- Note Notes (2) -------------------------------------------------------------------------------- Note (1): When accurate absorption values are available from published estimates, photometric E(B-V) measurements, or the C_Hbeta_ extinction map of the nebula, they are listed in this column. Otherwise we assume moderate absorption (A_V_~0.25mag) and indicate the value with a ')' in column n_AV Note (2): a: Position and proper-motion membership probability from McNamara et al. (1989) b: Position and proper-motion membership probability from Jones & Walker (1988) c: Position and proper-motion membership probability from van Altena et al. (1988) d: Proper-motion membership probability from McNamara & Huels (1983) e: Spectral type, V and Ic band photometry from Edwards et al. (1993) f: Spectral type from Strom (1993) g: Spectral type, B and V band photometry from Duncan (1993) h: Spectral type from Abt, Wang, & Cardona (1991) i: Spectral type from van Altena et al. (1988) j: Spectral type from the General Catalogue of Variable Stars (Kholopov et al. 1985) k: Spectral type from Walker (1983) l: Spectral type, B or V band photometry from Penston et al. (1975) or Penston (1973) m: Spectral type and V band photometry from Cohen & Kuhi (1979) n: Spectral type from Warren & Hesser (1977) o: Spectral type, B and V band photometry from Walker (1969) p: Spectral type from Parenago (1954) q: V and I_c_ band photometry from Prosser et al. (1994) r: V and I_c_ band photometry from Attridge & Herbst (1992) s: Position or spectral type, V and I_c_ band photometry from Herbig & Terndrup (1986) t: B and V band photometry from Duncan (1993) u: B and V band photometry from McNamara et al. (1989) v: B and V band photometry from van Altena et al. (1988) w: B, V, and I_c_ band photometry from Rydgren & Vrba (1984) x: B and V band photometry from Warren & Hesser (1977) y: I_c_ photographic magnitude from Jones & Walker (1988) z: Position, B and V photographic magnitudes from Andrews (1981) A: V photographic magnitude from Brun (1935) B: Position, B photographic or V photovisual magnitude from Parenago (1954) C: The bolometric luminosity of the late-type secondary cannot be determined D: Rotational period from Attridge & Herbst (1994) E: Rotational period from Attridge & Herbst (1992) F: Rotational period from Mandel & Herbst (1991) G: Rotational period from Walker (1990) H: Spectroscopic rotational velocity from Strom (1993) I: Spectroscopic rotational velocity from Duncan (1993) J: Spectroscopic rotational velocity from Abt et al. (1991) K: Spectroscopic rotational velocity from Walker (1990) L: Spectroscopic rotational velocity from Hartmann et al. (1986) M: One of two candidate optical counterparts. Upper limit corresponds to source flux N: Possible blend. Upper limit corresponds to half of source flux -------------------------------------------------------------------------------- Courtesy: Marc Gagne References: Abt et al. 1991 ApJ 367, 155 =1991ApJ...367..155A Andrews 1981 A Photometric atlas of the Orion Nebula (Belfadt: 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: Hartmann et al. 1986 ApJ 309, 275 =1986ApJ...309..275H Herbig & Terndrup 1986 ApJ 307, 609 =1986ApJ...307..609H 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: Penston 1973, ApJ 183, 505 =1973ApJ...183..505P Penston et al. 1975, MNRAS 171, 219 =1975MNRAS.171..219P Prosser et al. 1994, ApJ 421, 517 =1994ApJ...421..517P Rydgren & Vrba 1984 AJ 89, 399 =1984AJ.....89..399R Strom 1993 private comm. 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: ================================================================================ (End) Patricia Bauer [CDS] 19-Aug-1996