ING La Palma Technical Note no. 85
Standard Star lists available at the ING
This note provides a brief description of the sets of standard stars available for use with the Isaac Newton Group telescopes at the Roque de Los Muchachos Observatory on the island of La Palma. Lists of all the tables of standards are also given. This version refers to CMS generation 3 of SYSTEM.CAT.
Star Positions: All star positions given in these tables
are either extracted from astrometric catalogues or have been derived from
measurements of POSS glass plates. The equinox and epoch for each
position are identical unless otherwise stated.
Proper Motions: Catalogues were searched to provide proper
motions where available.
For any of the spectrophotometric standards which
might have a measurable proper motion, but were not in
any catalogue, plates were taken with
the 13-inch telescope at Herstmonceux in 1987, a position
measured, and compared with the position on the POSS plates.
Names: The name given to stars in the column LP name in the
tables can be entered directly at the control console of any one of the
WHT, INT or JKT and
the telescope will automatically set at the required position.
On the WHT the catalogues do not have to be read in
explicitly, but are accessed automatically by typing
GOCAT followed by the object name (eg SP2311-068)
given that an object of the same name does not
exist in the user's own catalogue.
On the INT and JKT, however, it is necessary to input the
catalogue, then request the object (eg INPUT FK5 followed by
NEXT N04+45 and then GO). On the INT and JKT
no more than 500 sources can be held in memory, so only the
catalogues required should be read in.
The catalogues available are:
|Catalogue Name||Table||No. of entries|
|FK5.CAT||(Table II and Table IX)||276|
|GEOM.CAT||(Table V and Table VI)||200|
Faint Pointing Grid:
Table I is a selection of AGK3, Perth70 and CPC2 stars forming
a grid over that part of the sky visible from La Palma.
CPC2 refers to the Cape Photographic Catalogue.
The plates for this were taken at SAAO, and measured using
the GALAXY automatic measuring machine at the RGO.
The accuracy of the catalogue is comparable with the AGK3.
All AGK3 stars have both equinox and epoch of 1950.0, Perth70 and
the CPC2 stars have equinox 1950.0 and epoch of date of the
second epoch plates.
The stars were selected to form a grid
at approximately one hour intervals
in Right Ascension and 15o in Declination,
with alternate hour zones offset in Declination.
Stars of approximately 9th magnitude and G0 to K0
spectral type range were chosen.
The positions in the files held in the computers on the INT
and JKT have been corrected to both equinox and epoch 1950.
Bright Pointing Grid:
Table II is a list of stars selected from the FK5 catalogue
on a grid similar to the faint pointing grid.
A diagrammatic version of this grid is given in Table IX.
These stars are all 6th magnitude or brighter.
For the +30o zone, two stars were selected at each
Right Ascension position, one north and the other south
of the La Palma zenith.
All the star names are given an N or S to indicate
whether the star is north or south of the zenith.
Stars which pass close to the zenith are useful for improving
the pointing coefficients of the Altazimuth WHT, and extra ones
are given at the end of this list.
Table III lists the photoelectric standard stars measured by
Landolt on the 16-inch and 36-inch telescopes at Kitt Peak (1973)
0.4m and 0.9m telescopes at the Cerro Tololo Observatory (1983).
Magnitudes as well as colours are given to help the observer
determine a suitable exposure.
The UBV photometry is based on the Landolt (1973) sytem which
was derived from Johnson and Morgan (1953).
The RI photometry is on the Cousins (1976)
system, which was derived from the Kron et al. (1953) data.
Cousins, A.W.J. 1976, Mem. R. Astron. Soc., 81, 25.
Johnson, H.L. & Morgan, W.W. 1953, Astrophys. J., 117, 313.
Kron, G.E., White, H.S. & Gascoigne, S.C.B. 1953 Astrophys. J, 118, 502.
Landolt, A.U., 1973, Astron. J., 78, 959.
Landolt, A.U., 1983, Astron. J., 88, 439.
Table IV is the list of Spectrophotometric standards of
Oke, Stone and Fillipenko & Greenstein.
A complete set of these data, with flux plots and finding charts,
is given in La Palma Technical Note 65 and Technical Note 100.
Fillipenko, A.V. & Greenstein, J.L., 1984, Publ. astron. Soc. Pacif., 96, 530.
Oke, J.B., 1974, Astrophys. J. Suppl., 27, 21.
Oke, J.B. and Gunn, J.E., 1983, Astrophys. J., 266, 713.
Stone, R.P.S., 1977, Astrophys. J., 218, 767.
Tables V and VI are lists of stars measured to arcsecond accuracy
to test the detector and focal plane geometry.
Table V has two fields (2 arcmin square) which are
useful for the acquisition TVs on all three telescopes and the
Cassegrain autoguider on the WHT.
Table VI has two fields (approximately 15 arcmin square) which
are suitable for the full focal planes.
Centres for these fields are given in the first line of each
list (eg F1), followed by positions for all the stars in
the field (eg F1-1).
Photometric sequences in compact fields:
Table VII is a list of photometric sequences for CCD fields.
The positions given are the field centres.
Vmax gives the magnitude of the brightest star and Vmin
give the magnitude of the faintest star measured in the field.
The final column gives the passbands for which photometry is available.
Christian, C.A., Adams, M., Barnes, J.V., Butcher, H., Hayes, D.S., Mould, J.R., & Siegel, M., 1985, Publ. astron. Soc. Pacif., 97, 363.
Schild, R.E., 1983, Publ. astron. Soc. Pacif., 95, 1021.
Stobie, R.S., Sagar, R. & Gilmore, G. 1985, Astron. Astrophys. Suppl. Ser., 60, 503.
Table VIII is a list of areas of sky in which there are
few stars. These are useful for flat fields and fringe frames.
Christian, C.A., Adams, M., Barnes, J.V., Butcher, H., Hayes, D.S., Mould, J.R., & Siegel, M., 1985, Publ. astron. Soc. Pacif., 97, 363. Users' Manual for the CCD Camera on the 0.9m telescope. K.P.N.O.