II/127 Visual Double Stars with Early-Type Primaries. IV (Lindroos 1985)
A Study of Visual Double Stars with Early-Type Primaries.
IV. Astrophysical Data
Lindroos K.P.
<Astron. & Astrophys. Suppl., 60, 183, (1985)>
=1985A&AS...60..183L 1985A&AS...60..183L
ADC_Keywords: Photometry, uvby, beta ; Stars, double and multiple
Description:
Astrophysical parameters (MK class, colour excess, absolute magnitude,
distance, effective temperature, mass and age) are derived from
calibrations of the uvbybeta indices for the members of 253 double
stars with O or B type primaries and faint secondaries. The
photometric spectral classification is compared to the MK classes and
the agreement is very good. The derived data together with
spectroscopic and JHKL data indicate that these stars are likely to be
members of physical systems. For 90% of the physical pairs the
projected separations between the components is less than 25,000 AU. A
majority of the physical secondaries are late type stars and 50% of
them are contracting towards the zero-age main-sequence (ZAMS).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
data.dat 97 544 Data (table VI)
notes.dat 80 326 Notes on Individual Stars
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Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD *HD number
8- 11 A4 --- Comp *Component designation as given in Paper II
13- 21 A9 --- rel *Relation between secondary and primary
23- 31 A9 --- Sp1 MK class from Paper I or from literature
33 A1 --- --- [(] Parentheses
34- 41 A8 --- Sp2 *MK class estimated from photometric indices
42 A1 --- --- [)] Parentheses
44- 47 F4.2 mag E(b-y) ? Colour Excess: if negative, assumed to be 0
49- 53 F5.2 mag VMag ? Absolute magnitude
55- 59 F5.2 mag Dmag ? Height above zero-age main sequence
61- 65 F5.2 [solLum] lnLum ? Logarithm of the luminosity
67- 71 F5.3 [K] lnTeff ? Logarithm of the effective temperature
73 A1 --- l_Age [ <] Indicates upper limit of Age
74- 76 I3 Ma Age ? Age of the primary
78- 81 F4.1 solMass Mass ? Mass for primary
83- 86 I4 pc Dist ? Distance
88- 92 I5 AU Sep ? Projected separation between components
94- 95 A2 --- rem *[ CSB?] Remarks
97 A1 --- n_HD [ *] Indicates a note detailed in notes.dat
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Note on HD:
When data on several components is given, each component occupies a
separate record. The HD number is repeated for each component.
Note on Comp:
An asterisk (*) following the component designation of composite
primaries indicates that the magnitude difference is less than 4.0
Note on rel:
PH = Physical secondary
OPT = Optical secondary
? = Undecided
Uncertain cases are indicated by a "?" following the most likely
relation. Numbers refer to which of the criteria the classification is
based upon. A secondary is classified as an optical component if any
of the following criteria is fulfilled:
1 = The absolute magnitude Mv' places the star more than 0.5 mag below
the ZAMS at (b-y)', (or at the (b-y)0 corresponding to the
spectral type). Primaries noted to be spectroscopic binaries
have been corrected for equally bright components.
2 = Mv' is inconsistent with the MK classification.
3 = (b-y)' (or c' for B stars) inconsistent with the MK classification.
4 = For stars earlier than G0 the difference between Mv' and Mv(beta) or
Mv(c') is larger than 1.0 mag.
5 = The indices m', c' and beta are inconsistent with the MK class
corresponding to (b-y)' and Mv'.
6 = The components have different radial velocities in Paper III.
7 = Astrometric data show that the system is optical.
8 = Some secondaries which did qualify as physical companions by the
criteria above were still considered as optical if their
position in the HR diagram would be in serious conflict with
the evolutionary tracks and the assumption of coeval formation
of the primary and secondary.
Note on Sp2:
d = dwarf
g = giant
Note on rem:
C = According to Age the star is still contracting with respect to ZAMS.
SB = Spectroscopic binary
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD number of star
10- 13 A4 --- Comp Component(s)
15 A1 --- --- [:] in first record, blank for continuation
17- 80 A64 --- Text Text of note
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References:
I. Gahm G.F., Ahlin P., and Lindroos K.P. (1983A&AS...51..143G 1983A&AS...51..143G)
II. Lindroos K.P. (1983A&AS...51..161L 1983A&AS...51..161L)
III. Gahm G.F. (1982) Stockholm Obs. Rep. No. 20.
IV. Lindroos K.P. (1985A&AS...60..183L 1985A&AS...60..183L)
(End) Julie Anne Watko [SSDOO/ADC] 10-Apr-1996