J/AJ/134/2474 Hα emission-line stars in 7 dwarfs galaxies (Massey+, 2007)
A survey of local group galaxies currently forming stars. III.
A search for luminous blue variables and other Hα emission-line stars.
Massey P., Mcneill R.T., Olsen K.A.G., Hodge P.W., Blaha C., Jacoby G.H.,
Smith R.C., Strong S.B.
<Astron. J., 134, 2474-2503 (2007)>
=2007AJ....134.2474M 2007AJ....134.2474M
ADC_Keywords: Galaxies, nearby ; Stars, emission ; Photometry, H-alpha
Keywords: catalogs - galaxies: stellar content - stars: early-type -
supergiants - surveys
Abstract:
We describe a search for Hα emission-line stars in M31, M33, and
seven dwarfs in or near the Local Group (IC 10, NGC 6822, WLM, Sextans
B, Sextans A, Pegasus, and the Phoenix dwarf) using interference
filter imaging with the KPNO and CTIO 4m telescopes and Mosaic
cameras. The survey is aimed primarily at identifying new luminous
blue variables (LBVs) from their spectroscopic similarity to known
LBVs, avoiding the bias toward photometric variability, which may
require centuries to manifest itself if LBVs go through long quiescent
periods. Follow-up spectroscopy with WIYN confirms that our survey
detected a wealth of stars whose spectra are similar to the known
LBVs.
Description:
The narrowband observations were made with the Mosaic cameras mounted
at the prime foci of the KPNO and CTIO 4m telescopes. The instruments
and basic reduction procedures are given in detail in Paper I (Cat.
J/AJ/131/2478).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables.dat 139 7158 Hα emission-line stars in 8 galaxies
(tables 8-15 of the paper)
table17.dat 68 126 New spectroscopic identifications
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See also:
J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)
J/AJ/133/2393 : UBVRI phot. in 7 Local Group dwarf galaxies (Massey+, 2007)
Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Gal Galaxy name
11- 29 A19 -- LGGS LGGS Designation (JHHMMSS.ss+DDMMSS.s)
31- 32 I2 h RAh Hour of Right ascension (J2000)
34- 35 I2 min RAm Minute of Right ascension (J2000)
37- 41 F5.2 s RAs Second of Right ascension (J2000)
43 A1 -- DE- Sign of the Declination (J2000)
44- 45 I2 deg DEd Degree of Declination (J2000)
47- 48 I2 arcmin DEm Arcminute of Declination (J2000)
50- 53 F4.1 arcsec DEs Arcsecond of Declination (J2000)
55- 59 F5.2 mag HAmag The Hα band magnitude
61- 65 F5.2 mag HA-S2 The (Hα-[SII]) color index
67- 71 F5.2 mag O3-c The ([OIII]-continuum) color index
73- 77 F5.2 mag Vmag The V band magnitude
79- 83 F5.2 mag B-V The (B-V) color index
85- 89 F5.2 mag U-B ?=99.99 The (U-B) color index
91- 95 F5.2 mag Qmag ?=99.99 reddening-free index
Q = U-B -0.72(B-V)
97-116 A20 -- SpType Spectral class (if available)
118-133 A16 -- CrossID Cross identification (if available)
135-139 A5 -- Ref References for spectral type (1)
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Note (1): References as follows:
1 = Paper I, Massey et al. 2006, Cat. J/AJ/131/2478
2 = This paper
3 = Massey et al. (1996, Cat. J/ApJ/649/629)
4 = Massey et al. (1995, Cat. J/AJ/110/2715)
5 = Monteverde et al. (1996A&A...312...24M 1996A&A...312...24M)
6 = Hubble & Sandage (1953ApJ...118..353H 1953ApJ...118..353H)
7 = Massey & Johnson (1998, Cat. J/ApJ/505/793) and references therein
8 = Corral (1996AJ....112.1450C 1996AJ....112.1450C)
9 = Viotti et al. (2007A&A...464L..53V 2007A&A...464L..53V) and references therein
10 = Bianchi et al. (1994A&A...292..213B 1994A&A...292..213B)
11 = Crowther et al (2003A&A...404..483C 2003A&A...404..483C)
12 = Massey & Armandroff (1995AJ....109.2470M 1995AJ....109.2470M)
13 = Westerlund et al (1983A&A...123..159W 1983A&A...123..159W)
14 = Bresolin et al. (2006ApJ...648.1007B 2006ApJ...648.1007B)
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Byte-by-byte Description of file: table17.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Gal Galaxy name
11- 29 A19 -- LGGS LGGS Designation
31- 60 A30 --- SpType Spectral classification
61 A1 --- Note Note (1)
63- 68 A6 --- Fig Figure number(s)
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Note (1): Notes as follows:
a = In a few cases where our fiber spectroscopy revealed only the
spectra of an H II region, previous long-slit spectra had
permitted a spectral type to be determined for the underlying
star. We include these here and retain the originals in Tables 8-11.
b = Previous spectral type is shown, but we adopt the new one
(given first) here.
c = Previously called WN by Massey & Conti (1983ApJ...273..576M 1983ApJ...273..576M); see text.
d = Previously called B0.5 Ia+WNE by Massey et al. (1996, Cat.
J/ApJ/469/629); see text.
e = Previously called B1 Ia (101-A) by Monteverde et al.
(1996A&A...312...24M 1996A&A...312...24M); see text.
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History:
From electronic version of the journal
References:
Massey et al., Paper I 2006AJ....131.2478M 2006AJ....131.2478M, Cat. J/AJ/131/2478
Massey et al., Paper II 2007AJ....133.2393M 2007AJ....133.2393M, Cat. J/AJ/133/2393
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 13-Feb-2010