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J/AJ/110/2739 H-alpha emitting regions in M33 (Calzetti+ 1995)
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An atlas of H-alpha emitting regions in M33: a systematic search for
SS433 star candidates.
Calzetti D., Kinney A.L., Ford H., Doggett J., Long K.S.
<Astron. J. 110, 2739 (1995)>
=1995AJ....110.2739C (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, early-type ; Stars, emission
Description:
We report finding charts and accurate positions for 432 compact
H{alpha} emitting regions in the Local Group Galaxy M33 (NGC 598), in
an effort to isolate candidates for an SS433-like stellar system. The
objects were extracted from narrowband images, centered in the rest
frame H{alpha} ({lambda}6563A) and in the red continuum at 6100A. The
atlas is complete down to V=~20, and includes 279 compact H II regions
and 153 line emitting point-like sources. The point-like sources
undoubtedly include a variety of objects: very small H II regions,
early type stars with intense stellar winds, and Wolf-Rayet stars, but
should also contain objects with the characteristics of SS433. This
extensive survey of compact H{alpha} regions in M33 is a first step
towards the identification of peculiar stellar systems like SS433 in
external galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 153 H-alpha line emission candidates.
table2.dat 48 279 Halpha-embedded candidates
table4.dat 41 36 Cross-correlation between candidates
and known Supernova Remnant and X-ray sources.
table5.dat 17 50 Cross-correlation between candidates
and known Radio sources.
tables.tex 79 1080 LaTeX version of the tables
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number of the star in the table.
5 A1 --- Field Identification of the field in which the star
can be found.
7- 9 I3 --- No Identification number of the star in the field
10 A1 --- n_No [eb] "e": emission line candidate (table1)
"b": Halpha embedded candidate (table2)
12 I1 h RAh Right ascension (1950)
14- 15 I2 min RAm Right ascension (1950)
17- 22 F6.3 s RAs Right ascension (1950)
24- 25 I2 deg DEd Declination (1950)
27- 28 I2 arcmin DEm Declination (1950)
30- 34 F5.2 arcsec DEs Declination (1950)
36 A1 --- l_EW Limit flag on EW
37- 42 F6.1 0.1nm EW ? Equivalent width of the H-alpha line emission.
(only in table1)
44- 48 F5.2 mag Vmag ? V magnitude, calculated from the continuum
at 6100 A.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number from Tables 1 or 2.
5- 7 I3 --- No Identification number from Tables 1 or 2.
8 A1 --- n_No [eb] e: emission line; b: Halpha embedded
10- 16 A7 --- SNR Identification of the Supernova Remnant from
Long et al. 1990, and Gordon et al. 1995.
18- 21 F4.1 arcsec rhoSNR ? Separation between the candidate and the
Supernova Remnant.
23- 26 A4 --- PSPC Identification of the X-ray source detected
with the ROSAT PSPC (Long et al. 1990)
28- 31 F4.1 arcsec rhoPSPC ? Separation between the candidate and the
X-ray source.
33- 36 A4 --- HRI Identification of the X-ray source detected
with the ROSAT HRI (Schulman & Bregman 1995)
38- 41 F4.1 arcsec rhoHRI ? Separation between the candidate and the
X-ray source.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number from Tables 1 or 2.
5- 7 I3 --- No Identification number from Tables 1 or 2.
8 A1 --- n_No [eb] e: emission-line; b: Halpha embedded
10- 12 I3 --- IDradio Identification of the Radio source from
Gordon et al. 1995.
14- 17 F4.2 arcsec rho Separation between the candidate and the
Radio source.
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Table 3: Cross-correlations: Candidate Wolf-Rayet stars
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Seq No WR(a) RA (1950) DE (1950) rho(b)
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32 25e MC20 01 30 26.30 30 29 39.0 2.83
41 107e MCMS12 01 31 03.03 30 28 28.8 2.44
219 81b MC29 01 30 44.10 30 26 07.0 2.21
189 94b MC31 01 30 44.80 30 26 12.0 1.45
133 96b MCMS04 01 30 44.85 30 25 54.6 0.21
55 133b MC44 01 30 53.40 30 17 55.0 2.47
208 276b MCMS15 01 31 30.20 30 18 25.3 2.95
184 277b MCMS15 01 31 30.20 30 18 25.3 2.69
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a: Identification of the Wolf-Rayet star
MC: Massey & Conti 1983
MCMS: Massey , Conti, Moffat & Shara 1987
b: Separation, in arcseconds, between the candidate
and the Wolf-Rayet star
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Nomenclature Notes:
Objects from Table 1 are designated <[CKF95] Em NNN>
and those from Table 2 are designated <[CKF95] HII NNN>
Courtesy: D. CALZETTI@stsci.edu
References:
Gordon S.M. et al. 1995 (in prep.)
Long K.S. et al. 1990, ApJS 72, 61 =1990ApJS...72...61L
Massey P. & Conti P.S. 1983, ApJ 273, 576 =1983ApJ...273..576M
Massey P. et al. 1987, PASP 99, 816 =1987PASP...99..816M
Schulman E. & Bregman J.N., 1995, ApJ 441, 568 =1995ApJ...441..568S
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(End) Patricia Bauer [CDS] 08-Aug-1996