V/14 Estimated astrophysical parameters from uvby (Philip+ 1980)
uvby estimated astrophysical parameters
Philip A.G.D., Egret D.
<Astron. Astrophys. Suppl. Ser. 40, 199 (1980)>
=1980A&AS...40..199P 1980A&AS...40..199P
ADC_Keywords: Photometry, uvby, beta ; Effective temperatures ;
Keywords: Four-color photometry ; Early-type stars ; Astrophysical parameters
Description:
Observed values of the Stroemgren uvby colors were collected from the
literature. A computer program calculated the reddening for each star.
This value was used to compute the unreddened value of (b-v), c1, and
m1. These were then used to compute [c(1)], [m(1)], and [u-b] for the
star. Except for the H beta index, the observed quantities are not
included.
Introduction:
The stars were divided into groups by spectral types by means of the
bracket quantities. Stars which deviated too greatly from the standard
relations could not be dereddened. These include peculiar stars
and high luminosity stars and are listed in reject.dat. Various
discussions by Crawford were followed to deredden the other stars.
The zero point of the [Fe/H] relation was changed from 0.4 to 0.2 on
the basis of the study by Gustafsson and Nissen (1972A&A....19..261G 1972A&A....19..261G)
and some corrections were made to the effective temperature scale in
order to fit the new model by Kurucz (1979ApJS...40....1K 1979ApJS...40....1K). Otherwise,
the derivations followed the methods of Philip, Miller, and Relyea
(1976, Dudley Obs. Rep. No. 12, 1).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 131 9054 Estimated astrophysical parameter data
codes.txt 80 1079 Description of the LID designation scheme
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See also:
II/57 : A Catalog of uvby Measurements (Hauck+ 1980)
III/42 : Selected MK Spectral Types (Jaschek, 1978)
Byte-per-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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3- 12 A10 --- LID *Designation of the star (see "codes.txt" file)
13 A1 --- m_LID [1234DV] Multiplicity, variability or duplicity
15- 20 F6.3 mag (b-y)0 Dereddened Stroemgren index (b-y)
22- 27 F6.3 mag (c1)0 Dereddened Stroemgren index c1 = (u-v)-(v-b)
29- 34 F6.3 mag (m1)0 Dereddened Stroemgren index m1 = (v-b)-(b-y)
36- 41 F6.3 mag Hbeta ? Dereddened Stroemgren Hβ index
43- 48 F6.3 mag [c1] Extinction-independent Stroemgren index
50- 55 F6.3 mag [m1] Extinction-independent Stroemgren index
57- 62 F6.3 mag [u-b] Extinction-independent Stroemgren index
64- 69 F6.3 mag E(b-y) Derived color excess in (b-y)
71- 76 F6.3 mag dm1 Deviation of dereddened m1 index from ZAMS
78- 83 F6.3 mag dc1 ? Deviation of dereddened c1 index from ZAMS
85- 87 A3 --- SpG *Spectral group: B, A*, A, F, AM, AP
89- 97 A9 --- MKsp *Spectral classification of the star
99-103 F5.2 mag Mv ? Estimated visual absolute magnitude
106-109 F4.2 --- theta ? Estimated effective temperature (5040/T)
111-114 F4.2 [cm/s2] log.g ? Estimated gravity
116-119 F4.2 [Sun] [Fe/H] ? Estimated metallicity (relative to solar)
121-131 A11 --- Refs Bibliographical references to original data
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Note on LID:
Lausanne/Geneve coding system, see a full description in the
"codes.txt"
Note on SpG:
The spectral group is one of B, A*, A, F, AM, AP
Note on MKsp:
Selected MK Spectral Types classification by Jaschek M. (Cat. III/42)
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(End) Francois Ochsenbein [CDS] 15-Dec-1993, rev. 06-Nov-2006