J/AJ/106/591 OP Survey of Halo early-type stars (Rodgers+ 1993)
Early-type stars in orthogonal halo fields. I. An objective-prism survey
Rodgers A.W., Roberts W.H., Walker I.
<Astron. J. 106, 591 (1993)>
=1993AJ....106..591R 1993AJ....106..591R
ADC_Keywords: Surveys; Stars, early-type; Spectroscopy; Spectral types
Abstract:
The results are reported of an objective-prism survey of stars, mostly
earlier than spectral type F5, for two fields at
(l;b) = (90 deg and 270 deg; -45 deg). The fields, each of approximately
70 square degrees, are examined on plates taken with the Schmidt Telescope
of the Anglo-Australian Observatory. The brightness range of the stars
classified is 10 < V < 15. The prism combination used provides a
dispersion of 600 A/mm at Hgamma. The spectral classification
presented is defined by the equality of equivalent widths of Ca II K
and Hdelta at type "F0" and the absence of Ca II K in stars with
significant Balmer lines at type "A0". Positions listed in the catalog
were measured on the Stromlo PDS microdensitometer. Most stars were
subsequently identified with objects in the ST ScI-NASA-ESO Hubble
Space Telescope Guide Star Catalog in which positions have an accuracy
of near ± 1.0 arcsec.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 85 435 Catalog of early-type stars
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See also:
J/AJ/106/1839 : Metal-rich halo A stars (Paper II.) (Rodgers+ 1993)
Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 9 A9 --- Object Object identifier
12- 13 I2 h RAh Right Ascension J2000.0
15- 16 I2 min RAm Right Ascension J2000.0
18- 22 F5.2 s RAs Right Ascension J2000.0
24 A1 --- DE- Declination sign
25- 26 I2 deg DEd Declination J2000.0
28- 29 I2 arcmin DEm Declination J2000.0
31- 34 F4.1 arcsec DEs Declination J2000.0
37- 43 A7 --- Sp Spectral type
44- 48 F5.1 mag Vmag magnitude
50- 85 A36 --- Comment Comments and other designations
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Note:
This table contains the results of the spectral classification discussed in
detail in section 3 of the printed paper. Twelve objective prism plates with
a prism giving a dispersion of 600 A/mm at Hgamma were obtained on request
by the staff of the Schmidt Telescope Unit of the Anglo-Australian
Observatory. The plates were examined visually with a low power microscope
and the spectra classified by A.W. Rodgers.
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References:
Rodgers A.W. & Roberts W.H., Paper III. =1993AJ....106.2294R 1993AJ....106.2294R
Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 27-Jun-1994