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\title{Catalogue of ages, metallicities, orbital elements and other
       parameters for nearby F stars}
\author{V.A. Marsakov, Yu.G. Shevelev\\
        Institute of Physics, Rostov University, 194, Stachki av.,\\
        344104 Rostov-on-Don, Russia}
\date{25 April, 1994}

\begin{document}

\maketitle

\begin{abstract}
Absolute magnitudes, metallicities, effective temperatures, surface gravities,
distances, and tangential velocities are calculated for 5489 F stars with
homogeneous data on uvby photometry and proper motion, and placed within 80 pc
from the Sun. Components of space velocities, eccentricities of galactic orbits,
 perigalactic and apogalactic distances, and maximal remotnes from galactic
plane are presented for 1787 stars. Isochrone ages are determined for 3405
slightly evolved stars proceeding from Revised Yale isochrones.
\end{abstract}

\section{Introduction}
The present sample is composed on the base of the Hauck and Mermilliod (1985)
compilative homogenious catalogue wich contains all $uvby$ photometrical
measurements being known up to the end of 1983. The coordinates, spectral
classification, visual magnitudes, proper motions and radial velocities have
been added into our sample from Ochsenbein (1980) catalogue. The radial
 velocities from some other sourses have also been added.

The temperature indices $(b-y)$ were corrected for blanketing and
luminosity effects, according to Crawford (1975) are following:
\[ (b-y)_{cor} = (b-y) + 0.05\delta c_{1} + [0.1 + 3.6(2.72 - \beta'_{st})]
  \delta m_{1}, \]
where preliminary value $\beta'_{st}$ has been founded from the observed
$(b-y)$ colour by means of the table of standard indices from the same
reference paper. Final values of colour excess $\delta m_{1}$, $\delta
c_{1}$, and index $\beta_{st}$ are determined from $(b-y)_{cor}$ for each
star. Absolute magnitude and metallicity are obtained by using the relations:
\[ M_{V}=M_{V,ZAMS}-[9+20(2.72-\beta_{st})]\delta c_{1}  \]
(Crawford,1975), and
\[ [Fe/H] = 0.16 - 0.66(2.72 - \beta_{st}) - [12.3 - 38(2.72 - \beta_{st})]
   \delta m_{1} \]
(Carlberg et al., 1985), where $M_{V,ZAMS}$ is the absolute magnitudes of
ZAMS obtained by Crawford (1975) for the stars of solar--composition.
Crawford has estimated that the standard deviation in $M_{V}$ for a single
disk F stars proceeding from $uvby$ data is $\pm0.25^{m}$.

The effective temperatures and surface gravities are calculated by using the
Moon's (1985) methodic. In accordance with Moon the standard deviations of
this parameters are: $T_{eff}=\pm 100 K$, and $\lg g=\pm 0.06$. The distances
to the stars are calculated on the basis of the absolute magnitude and visual
magnitude  from Ochenbein (1980) catalogue. Distance errors of the stars mainly
due to absolute magnitude errors are estimated as 11% (Perry et al., 1983).
Component of tangential velocities was calculated on the base of proper motions
and photometric distancies. The components of the space velocities ralative
to the Sun are calculated only for 178 stars with radial velocities. The
galactic orbital elements are calculated for the same stars proceeding from
the paper by Allen and Santillan (1991) containing bulge, disk, and massive
spherical halo.

The ages was found for 3405 slightly evolved ($\delta M_{V}>0.3^{m}$) stars
proceeding from Revised Yale isochrones (Green et al., 1987). The stellar
deviation from the theoretical $ZAMS$ ($\delta M_{V}$), determined as
$[9+20(2.72-\beta_{st})]\delta c_{1}$, was used in comparison with the
theoretical isochrones. The helium content was assumed Y=0.25. The mean
value of stellar age was determined in the vicinity of geometrical place of
turn-off points at the H-R diagram, where three (sometimes---two) isochrones
are crossing in earch point (so-called "hook-region"). The uncertainty in the
age of these stars is about 15\% (Shevelev,Marsakov,1993).

The criteria for the selection of the sample were the following:
\begin{tabbing}
 \= $0.222\leq (b-y)_{cor}\leq 0.412$ \=(that coresponds approximately to F2-G2
                                    spectral interval);\\
 \> $-0.06\leq \delta c_{1}\leq 0.20$ \>(that excludes pecular and far evolved
stars);\\
 \> $R \leq 80 pc$ \> (that excluded reddened stars);\\
 \> $[Fe/H] > -1.0$ \> (interval, where the metallicity calibration is correct).
\\
\end{tabbing}

The final sample is practically full in the vicinity within 80 pc of the Sun
for stars with $(b-y)_{cor}$ \raisebox{-0.8ex}{$\stackrel{\textstyle{<}}
{\sim}$} 0.32, and completnes
equals about 60\% for the whole temperature interval. There is also some boundary
selection on the red end near 0.39 \raisebox{-1.0ex}{$\stackrel{\textstyle{<}}
{\sim}$}$ (b-y)_{cor} \leq 0.412$.

\section{File discription}
The present catalogue consists of 2 files:
\begin{tabbing}
 \=- File 1.      \=Description of the catalogue\\
 \>                 \>Record length: 80 bytes -- Number of records: ???.\\
 \>- File 2.      \=Catalogue of ages, metallicities, orbital elements and
 other\\ \>   \> parameters for nearby F stars.\\
 \>                 \>Record length: 142 bytes -- Number of records: 5498.\\
\end{tabbing}
A brief description of the data fields is given below. For earch field is
listed: mnemonic abbreviation of the data item; the position of the data in
File 2 (first--last byte or column number); a short description of the data
item.
%\linebreak
\begin{tabbing}
afshxvgjxbhjshs\=bhhihxjueigsh\=                               \kill
  HD           \>  1 - 6           \> HD number of the star\\
  D           \>   7       \> duplicity\\
  $(b-y)_{cor}$ \> 8 - 13   \> temperature index, corrected for blanketing and\\
              \>           \>        luminosity effects\\
  $\delta m_{1}$ \> 14 - 20 \> index of metallicity\\
  $\delta c_{1}$ \> 21 - 27 \> index of luminosity\\
  $[Fe/H]$     \>  28 - 33  \> metallicity\\
  $T_{eff}$   \> 34 - 38   \> effective temperature\\
  $\log g$     \> 39 - 43   \> gravity\\
  $M_{V}$     \> 44 - 48   \> absolute magnitude\\
  t           \> 49 - 54   \> age in billion years\\
  l           \> 55 - 61   \> galactic longitude\\
  b           \> 62 - 68   \> galactic latitude\\
  Sp          \> 69 - 79   \> MK spectral classification\\
  R           \> 80 - 83   \> distance from the star to the Sun in parsecs\\
  $V_{l}$     \> 84 - 90   \> components of tangential velocity in km/s relative\\
  $V_{b}$     \> 91 - 97   \> to the Sun in l- and b-derections respectively\\
  u           \> 98 -104   \> components of velocity in km/s relative to the Sun,\\
  v           \> 105 - 111 \> measured in a galactic frame and positive towards\\
  w           \> 112 - 118 \> the galactic anti-centre, in the direction galactic rota-\\
              \>           \> tion, and towards the north galactic pole respectively\\
  $R_{p}$    \> 119 - 124 \> perigalacticon in kpc\\
  $R_{a}$    \> 125 - 130 \> apogalacticon in kpc\\
  $Z_{max}$  \> 131 - 136 \> maximum remotness from galactic plane in kpc\\
  e          \> 137 - 142 \> eccentricity
\end{tabbing}
\section{References}
$[1]$ Allen C., Santillan A. 1991, Rev. Mexicana. Astron. Astrof. $\bf 22$, 255.\\
$[2]$ Carlberg A.G., Dawson P.C., Hsu T., Vandenberg D.A. 1985, Astrophys. J.
    $\bf  294$, 674.\\
$[3]$ Crawford D.L. 1975, Astron. J. $\bf 80$, 955.\\
$[4]$ Green E., Demarque P., King C. 1987, The revised Yale isochrones.
  Yale Univ. obs.,\vskip 0.1 mm  New Haven.\\
$[5]$ Hauck B., Mermilliod M. 1985, Astron. Astrophys. Suppl. Ser. $\bf 60$, 61.\\
$[6]$ Moon T.T. 1985, Com. Univ. London obs. $\bf 78$, 1.\\
$[7]$ Ochsenbein F. 1980, Bull. Inf. CDS $\bf 19$, 74.\\
$[8]$ Perry C.L., Johnston L., Crawford D.L. 1983, Astron. J. $\bf 87$.1751.\\
$[9]$ Shevelev Yu.G., Marsakov V.A. 1993, Astron. Zhurn. $\bf 70$, 1218.\\
\end{document}

