J/AJ/111/846 Orion HST survey (O'Dell+ 1996)
Hubble Space Telescope mapping of the Orion nebula.
I. A survey of stars and compact objects
O'Dell C.R., Wong S.K.
<Astron. J. 111, 846 (1996)>
=1996AJ....111..846O 1996AJ....111..846O
ADC_Keywords: Surveys ; Positional data ; Stars, pre-main sequence ; YSOs
Mission_Name: HST
Abstract:
We report on a survey of the brightest portions of the Orion Nebula
made with the Wide Field Planetary Camera 2 of the Hubble Space
Telescope. Fifteen paintings were made, each employing interference
filters isolating the principal emission lines of HI, [NII], and
[OIII] and another isolating an interval similar to the V bandpass. A
careful survey of compact objects of stellar and nearly stellar
appearance was made and astrometric solutions for individual fields
were used to determine positions accurate to about 0.1". 344 stars
were measured, down to about V=22. In addition to structures in
several of the previously known Herbig-Haro objects, 145 compact
sources that can be classified as proplyds were found. Proplyds are
young stars surrounded by circumstellar material which is rendered
visible by being in or near an HII region. In the central region,
where detection of proplyds is easiest, almost all of the low-mass
pre-main-sequence stars have obvious circumstellar material. The
fraction falls as one views areas away from the dominant photoionizing
star θ1C Ori. Six new dark disk proplyds are found, bringing
the total to seven. These are objects showing only in silhouette
against the bright background of the HII region. Most of these are
elliptical in form, indicating that they are circumstellar disks. In
addition to these compact sources, the new images allow detection of
numerous large structures previously unreported from ground-based
observations. These include shells and shocks apparently related to
Herbig-Haro objects and high velocity outflows from young stellar
objects.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 38 345 A listing of all objects in our field that
appeared entirely stellar
table2.dat 82 152 A listing of the Non-Stellar objects and the
principal information characterizing each object
table1.ps 72 658 PostScript version of table1
table2.ps 72 703 PostScript version of table2
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See also:
II/171 : Parenago Catalog of Stars in Orion Nebula (Parenago 1954)
J/ApJ/445/280 : ROSAT survey of the Orion nebula region (Gagne+ 1995)
J/ApJS/78/239 : Orion stars CO-added IRAS fluxes catalog (Weaver+, 1992)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- [OW94] Star designation
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 33 F5.2 arcsec DEs Declination (J2000)
35- 37 I3 --- JW ? Jones & Walker (1988AJ.....95.1755J 1988AJ.....95.1755J) number
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- [OW94] Object designation
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 33 F5.2 arcsec DEs Declination (J2000)
35- 58 A24 --- Names Other designations (1)
59 A1 --- n_Names [*] Note on F (Felli) names (2)
61 I1 --- Form [1/7] Form index (3)
62 A1 --- n_Form [*] *: semistellar objects
64- 78 A15 --- Size Size (4)
80- 82 A3 --- Notes Notes (5)
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Note (1): The abbreviation of a catalog is followed by the catalog number.
The abbreviations are :
F: Felli et al., 1993A&AS...98..137F 1993A&AS...98..137F
P: Prosser et al., 1994ApJ...421..517P 1994ApJ...421..517P
O: O'Dell, Wen & Hu, 1993ApJ...410..696O 1993ApJ...410..696O
J: Jones & Walker, 1988AJ.....95.1755J 1988AJ.....95.1755J
H: Herbig-Haro objects (Reipurth 1995, An electronic Catalog of
Herbig-Haro Objects, ftp, hd.eso.org in pub/Catalogs/Herbig-Haro,
see Cat. V/104)
M: McCullough, 1993ApJ...438..394M 1993ApJ...438..394M
MA: McCaughrean & Stauffer, 1994AJ....108.1382M 1994AJ....108.1382M
Note (2): Objects designation in Felli et al. (1993A&AS...98..137F 1993A&AS...98..137F)
FC : Object C
FK : Object K
FE : Object E
FO : Object O
FP : Object P
Note (3): the form index takes the following values:
1 = cusp with tail
2 = cusp without tail
3 = round head with tail
4 = elongated with diffuse boundary
5 = elongated with well-defined boundary
6 = circularly symmetric
7 = irregular
Note (4): the size are:
- For a cusp with tail object:
1st number is the long dimension of the cusp
2nd number is the short dimension of the cusp
3rd number is the length of the tail
- For a cusp without tail object: only the opening of the cusp is measured;
- For a round head with tail object:
1st number is the diameter of the head
2nd number is the length of the tail
- For an elongated with well-define boundary object:
1st number is the short dimension
2nd number is the long dimension
- For a circularly symmetric object: the number is the diameter.
Note (5): the symbols have the following meaning:
a = absent in [OIII]
b = dark and symmetric in [OIII] only
c = dark in Hα, [NII] and [OIII]
d = no tail in [OIII]
e = circularly symmetric in [OIII]
f = no tail in both Hα and [OIII]
g = dark and elongated with well-defined boundary in [OIII]
h = circularly symmetric in Hα
i = present in O'Deel & Wen (1994ApJ...436..194O 1994ApJ...436..194O)
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Acknowledgements: C. Robert O'Dell for PS versions
History: Ascii versions prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 05-Jan-1998