\documentstyle[epsf]{article}
\input {ibvs.sty}

\begin{document}
\IBVShead{4448}{4 March 1997}
\title{IDENTIFICATION OF DAHLMARK VARIABLES: I}

\begintext

     The amateur observer Lennart Dahlmark has published a useful series of
IBVS notes listing a number of candidate variable stars, most of which were
new.  Although adequate charts and reliable semi-accurate positions were
supplied, no other identifications were usually given.  If the stars are to be
recovered for further study and linkage within other surveys (IRAS, etc.), then
precise positions must be determined to make identification unambiguous within crowded galactic fields.

     Table 1  gives precise positions and identifications for the first
list of variables published by Dahlmark (1982).  The variable stars were
identified independently by the two authors.  Skiff compared Dahlmark's charts
against the Digitized Sky Survey (DSS) using the Goddard SkyView facility
(Scollick, 1995).  The identifications were found within SIMBAD (for the GSC)
and in the U.S. Naval Observatory's UJ1.0 and A0.9 star catalogues (Monet
{\it et al}., 1994; Monet {\it et al}., 1996).  Williams compared Dahlmark's
charts against the DSS, maintained as a service at the Center for Astrophysics
by the Computation Facility.  Positions are taken either from the GSC or
(preferably) from the USNO A1.0 (UA~1.0) catalogue.  For those objects not
found in these catalogues, positions were measured from the DSS, using 12--40
comparison stars from the UA~1.0 catalogue; the r.m.s.\ residuals of the
comparison stars were under 0{\farcs}3.


\begin{center}
{Table 1. Dahlmark Variables LD 8 -- LD 65\phantom{(}} \\
\begin{tabular}{lccccccl}
\hline
\\[-4mm]
Name & \multicolumn{2}{c}{RA\quad (2000)\quad Dec}& s & IRAS & GSC & n & Other ids. \\
\\[-4mm]
\hline
\\[-3mm]
LD 8       & 19 50 39.58 & +50 42 23.3 & U & 19492+5034 &            &   &              \\
LD 9       & 19 52 53.29 & +46 21 45.8 & G & 19513+4613 & 3558-01549 &   &              \\
LD 10      & 19 53 47.98 & +47 11 43.5 & D &            & 3562-01687 & * &              \\
LD 11      & 19 58 28.33 & +47 06 10.4 & D & 19569+4657 &            &   &              \\
LD 12      & 19 59 11.98 & +48 43 33.3 & G & 19577+4835 & 3562-00100 &   &              \\
LD 13      & 20 00 03.91 & +41 00 44.7 & U &            &            & * &              \\
LD 14      & 20 03 45.61 & +47 42 16.9 & D &            &            & * &              \\
LD 15      & 20 09 29.76 & +47 57 02.1 & G & 20079+4748 & 3563-00128 &   &              \\
LD 16      & 20 10 20.32 & +38 10 48.5 & G &            & 3151-02905 &   &              \\
LD 17      & 20 10 56.68 & +40 58 21.1 & U &            &            &   &              \\
LD 18      & 20 11 29.58 & +37 01 03.3 & U &            &            &   &              \\
LD 19      & 20 12 08.08 & +39 36 49.7 & G & 20103+3927 & 3155-02205 &   & V1633 Cyg    \\
LD 20      & 20 17 17.15 & +45 34 42.0 & U &            & 3572-00486 &   &              \\
LD 21      & 20 18 00.34 & +43 43 54.9 & U &            &            &   &              \\
LD 22      & 20 20 24.97 & +49 42 12.1 & U &            &            &   &              \\
LD 23      & 20 20 55.94 & +50 27 29.1 & G &            & 3580-00223 &   & V1774 Cyg    \\
\end{tabular}
\end{center}
\vfil\eject
\centerline{2}
\vskip 1mm

\begin{center}
{Table 1: Dahlmark Variables LD 8 -- LD 65 (cont.)} \\

\begin{tabular}{lccccccl}
\hline
\\[-4mm]
Name & \multicolumn{2}{c}{RA\quad (2000)\quad Dec}& s & IRAS & GSC & n & Other ids. \\
\\[-4mm]
\hline
\\[-3mm]
LD 24      & 20 34 06.09 & +49 21 54.4 & U & 20325+4911 &            &   &              \\
LD 25      & 20 35 53.57 & +42 58 26.1 & G &            & 3161-00327 &   &              \\
LD 26      & 20 36 57.08 & +37 52 33.8 & U & 20350+3741 &            &   & V1828 Cyg    \\
LD 27      & 20 39 59.55 & +49 57 49.0 & U &            &            &   &              \\
LD 28      & 20 42 24.57 & +42 18 05.2 & U &            &            & * &              \\
LD 29      & 20 47 54.43 & +45 41 27.0 & D &            & 3574-00339 &   &              \\
LD 30      & 20 48 13.95 & +46 33 28.3 & U &            &            &   &              \\
LD 31      & 20 50 04.98 & +37 29 59.6 & U & 20481+3718 &            &   & V1864 Cyg    \\
LD 32      & 20 52 27.87 & +46 24 51.7 & G &            & 3575-04390 &   &              \\
LD 33      & 20 55 08.00 & +38 37 43.7 & U &            &            &   &              \\
LD 34      & 20 57 53.62 & +42 45 54.7 & G &            & 3175-00313 &   & V1891 Cyg    \\
LD 35      & 21 00 38.17 & +38 38 32.2 & D & 20586+3826 & 3168-00004 &   &              \\
LD 36      & 21 03 04.03 & +37 48 30.0 & G & 21011+3736 & 3168-00351 &   & V1800 Cyg    \\
LD 37      & 21 04 17.08 & +37 51 06.6 & G & 21023+3739 & 3168-00575 & * &              \\
LD 38      & 21 06 33.13 & +37 32 51.0 & U &            & 3168-00583 & * &              \\
LD 39      & 21 07 29.80 & +37 10 44.7 & G &            & 2713-00439 & * & V1804 Cyg    \\
LD 40      & 21 07 39.51 & +40 40 01.6 & G &            & 3172-01009 &   &              \\
LD 41      & 21 08 10.43 & +37 28 16.4 & U &            &            &   &              \\
LD 42      & 21 09 44.00 & +37 49 33.4 & G &            & 3168-02663 &   &              \\
LD 43      & 21 14 46.21 & +44 17 45.0 & G & 21128+4404 & 3181-03797 &   & V1554 Cyg    \\
LD 44      & 21 15 06.92 & +44 42 16.7 & D & 21132+4429 & 3181-01373 &   & EM* CGHA 73  \\
LD 45      & 21 17 17.59 & +50 45 10.4 & U & 21156+5032 & 3601-00623 &   &              \\
LD 46      & 21 18 50.64 & +39 54 13.2 & U &            &            &   &              \\
LD 47      & 21 19 41.11 & +50 40 42.3 & U &            &            &   &              \\
LD 48      & 21 19 45.03 & +49 41 59.0 & G & 21180+4929 & 3597-01643 &   & EM* VES 391  \\
LD 49      & 21 21 00.26 & +38 13 50.9 & G &            & 3182-00035 &   & V1903 Cyg    \\
LD 50      & 21 23 41.39 & +48 11 15.9 & D & 21219+4758 & 3594-00490 &   &              \\
LD 51      & 21 27 29.74 & +39 17 11.0 & U &            &            &   &              \\
LD 52      & 21 28 44.83 & +38 00 13.8 & D &            & 3182-04181 & * & V1724 Cyg    \\
LD 53      & 21 30 45.44 & +43 31 58.4 & G & 21288+4318 & 3195-01178 &   & V1566 Cyg    \\
LD 54      & 21 30 49.90 & +43 30 15.3 & D &            & 3195-01686 & * &              \\
LD 55      & 21 31 15.00 & +38 46 32.1 & U & 21292+3833 &            &   &              \\
LD 56      & 21 31 28.58 & +40 58 30.9 & U & 21294+4045 &            & * & V1614 Cyg    \\
LD 57      & 21 32 31.98 & +38 57 54.8 & G &            & 3183-01551 &   & V1910 Cyg    \\
LD 58      & 21 32 50.27 & +39 22 08.2 & U & 21308+3908 &            &   &              \\
LD 59      & 21 33 21.47 & +38 02 45.6 & U &            &            & * & V1615 Cyg    \\
LD 60      & 21 36 21.64 & +38 23 23.6 & G &            & 3183-01717 &   &              \\
LD 61      & 21 38 31.79 & +45 42 46.7 & U & 21366+4529 &            &   & V1568 Cyg    \\
LD 62      & 21 39 40.62 & +43 18 20.4 & U & 21377+4304 &            &   &              \\
LD 63      & 21 42 36.55 & +44 56 36.1 & G & 21406+4442 & 3196-02133 &   & V1571 Cyg    \\
LD 64      & 21 43 19.47 & +50 39 14.3 & U & 21415+5025 &            &   & V1734 Cyg    \\
LD 65      & 21 43 33.64 & +49 08 58.3 & G & 21417+4855 & 3599-02290 &   & CGCS 5431    \\
\\[-3mm]
\hline
\end{tabular}
\end{center}
\vfill \eject

\centerline{3}
\vskip 1mm
\normalsize

Notes:

LD 10\quad\enskip Not visible on POSS-I O print, and R $\sim\!17$ on E print.
   GSC plate taken when V $\sim\!15$,\\
\hspace*{20mm}  blended with companion star to N with position end-figures 47\fss84/49\farcs9 (D).

LD 13\quad\enskip SE of two stars.

LD 14\quad\enskip Not IRAS 20021+4733.

LD 28\quad\enskip The brighter of two stars on DSS.

LD 37\quad\enskip Spectral type M5/7 (Dolidze 1975).

LD 38\quad\enskip Spectral type M5/7 (Dolidze 1975).

LD 39\quad\enskip Spectral type M7 (Dolidze 1975).

LD 52\quad\enskip ID verified against chart in Bychkov (1977b); SW star of two.

LD 54\quad\enskip Very close pair blended in GSC.  Position given is for
   brighter (on DSS) NW component.\\
\hspace*{20mm}  SE component has end figures 50{\fss}10/14{\farcs}1 (D).

LD 56\quad\enskip ID verified against chart in Bartunov (1977).

LD 59\quad\enskip ID verified against chart in Bychkov (1977a).
\vskip 5mm
\large

     The table lists the `LD' name followed by the J2000 position and its
source, coded in the table and notes as follows: U = UA~1.0; G = GSC~1.1;
D = measurement from DSS using UA~1.0 comparison stars.  The next two columns
give IRAS point-source and GSC designations.  An asterisk in the next column
indicates a note at the bottom of the table.  The final column contains
GCVS designations and other names from SIMBAD.

     The authors thank the following for their indispensable assistance in
completing this work: SIMBAD, maintained by the Centre de Donn\'{e}es
Astronomique, Strasbourg, France; and SkyView, maintained by Keith Scollick
at Goddard Space Flight Center.

\vskip 1cm

\beginauthors
Brian A. SKIFF
Lowell Observatory
1400 West Mars Hill Road
Flagstaff AZ 86001-4499
U.S.A.
e-mail: {\tt bas@lowell.edu}
\vskip 4mm
\authorsrightcol
Gareth V. WILLIAMS
Harvard-Smithsonian Center 
for Astrophysics
60 Garden Street
Cambridge MA 02138-1516
U.S.A
e-mail: {\tt gwilliams@cfa.harvard.edu}
\endauthors

\references

Bartunov, O.S.,  1977, {\it Astron. Tsirk.}, {\bf 943}, 7

Bychkov, S.M.,  1977a, {\it Astron. Tsirk}., {\bf 940}, 7

Bychkov, S.M.,  1977b, {\it Astron. Tsirk}., {\bf 959}, 7

Dahlmark, L.,  1982, {\it IBVS}, No.\,2157

Dolidze, M.V.,  1975, {\it Byull. Abastuman. Astrofiz. Obs.},
     {\bf 47}, 171

Monet, D., Canzian, B., and Henden, A.,  1994, {\it Bull. Amer. Astr. Soc.},
     {\bf 26}, 1314 (abstract); see also {\tt http://www.usno.navy.mil/pmm}

Monet, D.G., {\it et al}.  1996, ``USNO-A~V1.0,'' U. S. Naval Observatory,
Washington DC; see also {\tt http://www.usno.navy.mil/pmm}

Scollick, K.,  1995, {\tt http://skview.gsfc.nasa.gov/cgi-bin/v3.0/skyview\_advanced.pl}


\end{document}


