II/44 K-Line photometry of stars in Population I clusters (Hesser+ 1971)
K-line photometry of stars in Population I clusters,
Hesser J.E., Henry R.C.
<Astrophys. J. Suppl., 23, 453 (1971)>
=1971ApJS...23..453H 1971ApJS...23..453H
ADC_Keywords: Photometry, K-line; Clusters, open
Abstract:
Photoelectric photometry of the K-line of calcium has been performed
for the A stars of five open clusters (Hyades, Pleiades, IC 2391, IC
2602, and NGC 6475) and one association (Orion). All observations were
carried out simultaneously with the field stars measurements in Paper
II (II/43), with the 16-inch (40cm) and 36-inch (91cm) telescopes of
the Cerro Tololo Inter-American Observatory, between May 1969 and
January 1970.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
data.dat 127 168 Results (tables 1-6)
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See also:
II/42 : K-Line Photometry of A Stars (Henry, 1969)
II/43 : K-Line Photometry of Southern A Stars (Henry+ 1971)
Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cl Cluster name (1)
15- 20 I6 --- Star Star number in cluster (1)
22- 26 F5.2 mag Vmag V-band magnitude
28- 32 F5.2 mag B-V (B-V) color index
34- 39 F6.3 mag m1 m1 Stroemgren index
41- 46 F6.3 mag c1 ? c1 Stroemgren index
48- 53 F6.3 mag k Ca K-line index (3934Å)
55- 59 F5.3 mag e_k ? RMS error on k
61- 66 F6.3 mag dk Deviation of k-index from normal value
69 A1 --- Sg [EIL] Stroemgren's group (Early, Intermediate
or Late)
71- 76 F6.3 mag b-y ? (b-y) color index, reddening corrected
78- 83 F6.3 mag E(b-y) ? Reddening in (b-y)
85- 89 F5.3 mag beta ? Hβ Stroemgren index
91- 95 F5.3 mag [m1] ? reddening-independent metallicity index [m1]
97-102 F6.3 mag d[m1] ? Deviation of [m1] from normal
104-108 F5.3 mag [c1] ? reddening-independent luminosity index [c1]
111-114 F4.2 mag dV ? Deviation of V from main sequence
116-120 F5.3 mag u-b ? luminosity/temperature color index
122-127 F6.3 mag a ? Temperature parameter (2)
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Note (1): Star numbers refer to:
* NGC 6475: Koelbloed (1959BAN....14..265K 1959BAN....14..265K)
* Orion: number from Brun (1935POLyo...1...12B 1935POLyo...1...12B)
* Pleiades: number from Hertzsprung (1947AnLei..19a...1H 1947AnLei..19a...1H),
<Cl Melotte 22 NNN> in Simbad
* IC 2391: HD number
* IC 2602: HD(E) number, except star #57 is from Braes (1962BAN....16..297B 1962BAN....16..297B)
* Hyades: HD number
Note (2): temperature index:
* for stars of the early-group (E), the value is δ[m1],
calculated by the alternate method
* for stars of the intermediate group (early A stars), it is defined as:
a = (b-y) + 0.189[(u-b) - 1.36mag]
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History:
* the contents of tables 3 to 6 (NGC 6475 and Orion clusters excluded,
and without spectral classes) were originally keypunched at Institut
d'Astronomie de Lausanne (Switzerland) in October 1972,
* documentation, tables 1 and 2 were added in December 2016.
(End) Francois Ochsenbein [CDS] 30-Dec-2016