J/A+A/359/113 X-ray and IR study of Rho Oph dark cloud (Grosso+, 2000)
X-rays and regions of star formation:
a combined ROSAT-HRI/near-to-mid IR study of the Rho Oph dark cloud
Grosso N., Montmerle T., Bontemps S., Andre P., Feigelson E.D.
<Astron. Astrophys. 359, 113 (2000)>
=2000A&A...359..113G 2000A&A...359..113G
ADC_Keywords: Molecular clouds ; X-ray sources ; Infrared sources
Keywords: (Galaxy:) open clusters and associations: individual:
rho Ophiuchi cluster - stars: pre-main sequence - stars: formation -
X-rays: stars - infrared: stars
Abstract:
We have obtained two deep exposures of the ρ Oph cloud core region
with the ROSAT High Resolution Imager. The improved position accuracy
(1"-6") with respect to previous recent X-ray observations (ROSAT
PSPC, and ASCA) allows us to remove positional ambiguities for the
detected sources. We also cross-correlate the X-ray positions with IR
sources found in the ISOCAM survey of the same region at 6.7 and
14.3µm, in addition to sources (optical and IR) known from
ground-based observations, which are young stars (T Tauri stars, with
and without circumstellar disks, and protostars). We thus obtain the
best-studied sample of X-ray emitting stars in a star-forming region
(63 X-ray sources detected, and 55 identified).
Objects:
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RA (2000) DE Designation(s)
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16 28 06.0 -24 32 30 Rho Oph dark cloud
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 102 63 HRI X-ray sources
tableb1.dat 102 63 HRI X-ray sources counterpart identifications in
the ρ Oph cloud cores A & F
notes.dat 79 66 Individual notes
tableb1.tex 282 188 LaTeX version of table 1
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See also:
IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 1999)
Table 1: Log of ROSAT HRI Observations:
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Begin End
Pointing Core Obs Date Hour Date Hour Time Exposure
ID ks ks
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201835h A 1 1995 Aug 29 18h31m30s 1995 Sep 12 22h35m47s 1224.3 51.3
201834h F 1 1995 Mar 09 00h51m03s 1995 Mar 14 05h16m43s 447.9 12.5
201834h-1 F 2 1995 Aug 18 19h29m21s 1995 Aug 20 14h52m05s 27.8 27.5
201834h-2 F 3 1996 Sep 07 23h12m46s 1996 Sep 11 13h46m23s 331.6 37.2
F 1+2+3 1995 Mar 09 00h51m03s 1996 Sep 11 13h46m23s 47739.3 77.2
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- ROXR ROXR designation
6- 7 I2 h RAh Right ascension (J2000) (1)
9- 10 I2 min RAm Right ascension (J2000) (1)
12- 15 F4.1 s RAs Right ascension (J2000) (1)
17 A1 --- DE- Declination sign (J2000) (1)
18- 19 I2 deg DEd Declination (J2000) (1)
21- 22 I2 arcmin DEm Declination (J2000) (1)
24- 25 I2 arcsec DEs Declination (J2000) (1)
28- 29 I2 h RA1950h Right ascension (B1950) (1)
31- 32 I2 min RA1950m Right ascension (B1950) (1)
34- 37 F4.1 s RA1950s Right ascension (B1950) (1)
39 A1 --- DE1950- Declination sign (B1950) (1)
40- 41 I2 deg DE1950d Declination (B1950) (1)
43- 44 I2 arcmin DE1950m Declination (B1950) (1)
46- 47 I2 arcsec DE1950s Declination (B1950) (1)
50 I1 arcsec e_Pos rms uncertainty on Position (1)
52- 57 F6.1 --- LH Likelihood of existence value (1)
59- 60 A2 --- l_ct1 [≤ ] Limit flag on ct1
61- 64 F4.1 ct/ks ct1 ? Count rate of observation 1
67- 69 F3.1 ct/ks e_ct1 ? rms uncertainty on ct1
71- 72 A2 --- l_ct2 [≤ ] Limit flag on ct2
73- 76 F4.1 ct/ks ct2 ? Count rate of observation 2
78- 80 F3.1 ct/ks e_ct2 ? rms uncertainty on ct2
82- 83 A2 --- l_ct3 [≤ ] Limit flag on ct3
84- 87 F4.1 ct/ks ct3 ? Count rate of observation 3
89- 91 F3.1 ct/ks e_ct3 ? rms uncertainty on ct3
93- 94 A2 --- l_ct1+2+3 [≤ ] Limit flag on ct
95- 98 F4.1 ct/ks ct1+2+3 ? Count rate of observation (1+2+3)
100-102 F3.1 ct/ks e_ct1+2+3 ? rms uncertainty on ct
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Note (1): For the core F field, the indicated positions and the LH values
correspond to observation (1, 2 or 3) where LH and the position
accuracy are the best, i.e. when the count rate is highest.
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- ROXR X-ray source number in this article
(ANN or FNN)
5- 6 I2 --- ROXR1 ? Casanova et al. (1995ApJ...439..752C 1995ApJ...439..752C)
X-ray source number (ROXR1)
7 A1 --- n_ROXR1 [* ou] Note (1)
9- 10 I2 --- ROXR2 ? Casanova (1994, Ph.D. thesis, Paris VI
University) X-ray source number (ROXR2)
11- 12 A2 --- n_ROXR2 [* ou] Note (1)
14- 15 A2 --- ASCA Kamata et al. (1997PASJ...49..461K 1997PASJ...49..461K)
X-ray source number
16 A1 --- n_ASCA [ou] Note (1)
18- 37 A20 --- Name Counterpart name
38 A1 --- n_Name [* ou] Note (1)
40- 43 A4 --- ISO IR excess from Bontemps et al.
(2000, A&A, submitted) (2)
44- 45 A2 --- n_ISO [* ou] Note (1)
47- 53 A7 --- ClassIR IR class (3)
54 A1 --- n_ClassIR [*] Note in notes.dat file
56- 59 F4.1 mag AV ? Visual extinction
60 A1 --- n_AV [*] Note in notes.dat file
62- 68 F7.2 solLum Lum ? Stellar luminosity
69 A1 --- n_Lum [*] Note in notes.dat file
71- 72 A2 --- l_logLx1 [≤ ] Limit flag on logLx1
73- 76 F4.1 [10-7W] logLx1 ? X-ray luminosity for d=140pc (obs. 1)
77 A1 --- u_logLx1 [?] Uncertainty flag on logLx1
79- 80 A2 --- l_logLx2 [≤ ] Limit flag on logLx2
81- 84 F4.1 [10-7W] logLx2 ? X-ray luminosity for d=140pc (obs. 2)
85 A1 --- u_logLx2 [?] Uncertainty flag on logLx2
87- 88 A2 --- l_logLx3 [≤ ] Limit flag on logLx3
89- 92 F4.1 [10-7W] logLx3 ? X-ray luminosity for d=140pc (obs. 3)
93 A1 --- u_logLx3 [?] Uncertainty flag on logLx3
95- 96 A2 --- l_logLxtot [≤ ] Limit flag on logLxtot
98-101 F4.1 [10-7W] logLxtot ? X-ray luminosity for d=140pc (obs. 1+2+3)
102 A1 --- u_logLxtot [?] Uncertainty flag on logLxtot
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Note (1): o = out of observation field
u = unobserved source
* = note in notes.dat file
Note (2): red = ISOCAM source with IR excess
blue = ISOCAM source without IR excess
Note (3): IR Class:
nII = new class II
nIII = new class III
? = X-ray detected source for which intrinsic X-ray luminosity
cannot be determined
II-III? = class II or class III candidate
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [ROXR]
5- 7 A3 --- ROXR ROXR number
9- 80 A72 --- Note Text of the note (1)
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Note (1): Acronyms used in the text:
B = Barsony et al. (1997, Cat. J/ApJS/112/109)
BBRCG = Barsony et al. (1989ApJ...346L..93B 1989ApJ...346L..93B)
DoAr = Dolidze and Arakelyan (1959AZh....36..444D 1959AZh....36..444D)
El = Elias (1978ApJ...224..453E 1978ApJ...224..453E)
GSS = Grasdalen et al. (1973ApJ...184L..53G 1973ApJ...184L..53G)
GY = Greene and Young (1992ApJ...395..516G 1992ApJ...395..516G)
HD = The Henry Draper catalogue (Draper, 1918, Cat. III/135)
IRS = Wilking et al. (1989ApJ...340..823W 1989ApJ...340..823W)
ROXC = Montmerle et al. (1983ApJ...269..182M 1983ApJ...269..182M)
ROXs = Bouvier and Appenzeller (1992A&AS...92..481B 1992A&AS...92..481B)
S = abbreviation for ``Source'' in
Grasdalen et al. (1973ApJ...184L..53G 1973ApJ...184L..53G)
SKS = Table 1 of Strom et al. (1995, Cat. J/ApJ/438/813)
SR = Struve and Rudkjoebing (1949ApJ...109...92S 1949ApJ...109...92S)
U = The PMM USNO-A1.0 Catalogue (Monet et al., 1996, Cat. I/243)
VSS = Vrba et al. (1976AJ.....81..958V 1976AJ.....81..958V)
VSSG = Vrba et al. (1975ApJ...197...77V 1975ApJ...197...77V)
WL = Wilking and Lada (1983ApJ...274..698W 1983ApJ...274..698W)
WSB = Wilking et al. (1987AJ.....94..106W 1987AJ.....94..106W)
YLW = Young et al. (1989ApJ...340..823W 1989ApJ...340..823W)
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Acknowledgements: Nicolas Grosso
History:
* 12-May-2000: first archived
* 09-Dec-2000: table A1 added, and ROXR name homogenized in the notes.
(End) Patricia Bauer [CDS] 12-May-2000