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J/ApJ/445/280 ROSAT survey of the Orion nebula region (Gagne+ 1995)
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Deep ROSAT HRI observations of the Orion nebula region.
Gagne M., Caillault J.-P., Stauffer J.R.
<Astrophys. J. 445, 280 (1995)>
=1995ApJ...445..280G (SIMBAD/NED BibCode)
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ADC_Keywords: X-ray sources ; Nebulae
Keywords: ISM: individual (Orion Nebula) - star: pre-main-sequence -
X-rays: stars
Mission_Name: ROSAT
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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table6
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Bytes Format Units Label Explanations
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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)
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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
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Courtesy: Marc Gagne <marc@casa.Colorado.EDU>
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: <II/139>
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: <II/171>
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: <II/36>
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(End) Patricia Bauer [CDS] 19-Aug-1996