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III/43 Luminous Stars in the Southern Milky Way (Stephenson+ 1971)
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Catalogue of Luminous Stars in the Southern Milky Way
Stephenson C.B., Sanduleak N.
<Publ. Warner & Swasey Obs. 1 (1971)>
=1971PW&SO...1....1S
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ADC_Keywords: Milky Way ; Stars, luminous ; Spectral types
Description:
This Catalogue represents an extension to the entire Southern Milky
Way of the objective-prism survey for intrinsically luminous stars in
the Northern Milky Way <III/76> that was carried out jointly by the
Hamburg and Warner and Swasey observatories.
The object has been to survey the Southern Milky Way with plates as
similar as possible to the plates used for the Northern Milky Way,
including similarity of limiting magnitude. To this end the objective
prism that was used with the Warner and Swasey Schmidt telescope for
the Northern survey was sent to Cerro Tololo, Chile, where it was used
by Sanduleak to photograph the Southern Milky Way with the Schmidt
telescope of the University of Michigan.
The survey was planned to have a minimum extent in galactic latitude
of +/-10deg. On each field three spectral plates were taken, all
intended to have spectral widening near 0.2 mm. One blue-region
(Kodak IIa-O) plate was given an exposure of 11 minutes, and another
was double-exposed for 3 minutes and 10 seconds. A red plate
(Kodak 103a-F plus Schott GG 14 filter) was also taken for the
detection of any appreciable Halpha emission, with three exposures
nominally 9 minutes, 1 minute and 10 seconds. The dispersion is
580 Angstroems/mm at Hgamma and about 1000 Angstroems/mm near Hlpha;
a Michigan objective prism of 4deg angle, was used to obtain the
Halpha plates.
The spectral classification system is that discussed by Slettebak and
Stock (1957) and Nassau and Stephenson (1960). An important result of
the generally excellent quality of the new survey plates is that the
ce stars (OB stars apparently having the Balmer continuum in emission)
are easily recognised.
The magnitudes are based upon eye estimates of image density on the
blue-region spectral plates, calibrated by published magnitude
sequences, and are generally characterised by a probable error of
1/3 to 1/4 mag.
The equatorial coordinates for the stars have been derived from
measurements of the objective-prism plates, using the SAO <I/131>
catalogue for reference stars. The positions derived in this way are
accurate to 1" to 2" of arc, providing spectral lines are visible for
measurement. When spectral lines are not visible, the coordinate
parallel to the spectral dispersion -- always the declination --
becomes 10" or somewhat more uncertain.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
main.dat 117 5132 The LSS Catalogue
rem.dat 80 357 Remarks and Notes
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Byte-by-byte Description of file: main.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Mod [*] Not blank if modifications have been
done to the original catalogue
4- 7 I4 --- LSS [1/5132]+ Designation in the catalogue
9- 16 A8 --- DM Durchmusterung (BD north of -22deg, or CD)
identification from the original catalogue
17- 18 A2 --- n_DM [NSFP ] Note (North, South, Following,
Preceding) about DM identification
19- 32 A14 --- SpType Spectral type from original catalogue (1)
34- 36 I3 0.1mag Pmag []? Photographic magnitude
37 A1 --- u_Pmag Uncertainty flag (:) on Pmag
38- 39 I2 h RAh Right Ascension 1950 (hours)
40- 41 I2 min RAm Right Ascension 1950 (minutes)
42- 44 I3 0.1s RAds Right Ascension 1950 (deci-seconds)
45 A1 --- u_RAds Uncertainty flag (:) on RA
46 A1 --- DE- Declination 1950 (sign)
47- 48 I2 deg DEd Declination 1950 (degrees)
49- 50 I2 arcmin DEm Declination 1950 (minutes)
51- 52 I2 arcsec DEs Declination 1950 (seconds)
53 A1 --- u_DEs Uncertainty flag (:) on DE
54- 82 A29 --- Rem Remarks (2)
83- 96 A14 --- DM1 DM identification from CSI (3)
97-110 A14 --- DM2 Second DM identification (3)
111-117 A7 --- HD Henry Draper Catalogue identification
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Note (1): spectral annotations (all reported in uppercase letters):
ce means that the Balmer continuum appears to be in emission;
le means that at least one emission line, nearly always a Balmer
line, is visible on a blue region plate;
h means that Halpha was noted in emission on an independently
scanned Halpha plate;
r means that the spectrum appears distinctly reddened;
rr means that the spectrum appears extremely reddened.
: a colon means that everything preceding it is uncertain,
() parentheses means that the data within the parentheses are
uncertain;
! an exclamation point denotes that the datum immediately preceding
it is exceptionally pronounced.
Ia+ A luminosity class of Ia+ indicates an apparent luminosity
brighter than Ia.
* Newer classifications by Reed and Beatty, 1995 =1995ApJS...97..189R
Note (2): the remarks include:
- Previously published spectral type given in the catalogue of
Jaschek et al (1964) for HD stars;
- designation in the 2d edition of the General Catalogue of
Variable Stars for stars for which a DM number is given;
- presence in the Catatogue of Stars Suspected of Variability
(indicated by "CSV"), for stars with a DM number;
- designation in the Innes double-star catalogue (SDS) or that
of Aitken (ADS), for stars with a DM number;
- designation in the Bright Star Catalogue.
- the notation "Hbeta wk" means that the Balmer decrement
(not merely Hbeta) is abnormal, suggesting that there is unseen
line emission in the blue region.
- the remark that the ultraviolet is steep or weak usually means
that there is a suspicion of a Balmer jump.
- "Flat continuum" refers to an OB star that is unusually intense
in the ultraviolet and exceptionally lacking in apparent space
reddening; such stars are sometimes white dwarfs, hot subdwarfs,
old novae, etc.
- "R" indicates further remarks in the notes (file "rem") to the
catalogue; these notes often contain information relevant to
identifying a star in a crowded region.
Note (3): designations from the Catalogue of Stellar Identifications
(CSI developed at CDS) are indicated .. as the first two letters;
the other designations in the first two letters are BD (Bonn),
CD (Cordoba), or CP (Cape Photographic)
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Byte-by-byte Description of file: rem.dat
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Bytes Format Units Label Explanations
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2- 5 I4 --- LSS [1/5132]+= Designation in the catalogue
7- 80 A74 --- Text Text of remarks; LSS is repeated when the
text is made of several lines
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See also:
III/76 : Luminous Stars in the Northern Milky Way.
J/ApJS/97/189 : A Spectroscopic Database for LSS stars by Reed and Beatty
References:
Jaschek, C., Conde, H., and Sierra, A.C., 1964, Obs. Astron.,
La Plata, Serie Astronomica, XXVIII (2).
Nassau, J.J., and Stephenson, C.B, 1960, Astrophys. J., 132, 131.
Slettebak, A,, and Stock, J. 1957, Zeitschr. Astroph., 42, 67.
Historical Notes:
* Errors in the "Luminous Stars in the Milky Way" reported by
Bischoff M. =1978BICDS..14...15B
* Version 25-Oct-1993: First electronic description.
* Version 14-Apr-1994: HD number of LSS 1969 reported by S. Nishimura
changed from 30562G to 305627
* 05-Oct-1995: Standardized the Documentation at CDS, and added the
Description and Notes in this file.
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(End) Francois Ochsenbein [CDS] 05-Oct-1995