J/AN/283/109 Star positions in the region of alpha Per (Heckmann+, 1956)
Eigenbewegungen in der Umgebung von alpha Persei.
Heckmann O., Dieckvoss W., Kox H.
<Astron. Nachrichten, 283, 109-139 (1956)>
=1956AN....283..109H 1956AN....283..109H
ADC_Keywords: Clusters, open ; Positional data
Description:
This file contains 1221 stars observed for spectral type in the field
of the alpha Persei cluster. The types were published in the well
known proper-motion survey by Heckmann et al. (1956AN....283..109H 1956AN....283..109H),
and were determined by Wachmann with the equipment and methods used
for the Bergedorf selected areas surveys (BSD). In general the
brighter HD stars were not observed for spectral type, but most of
these have been classified on the MK system by Roman & Morgan
(1950ApJ...111..426R 1950ApJ...111..426R) and in later work.
Nearly all the stars are included in SIMBAD with the source positions,
and most also appear in WEBDA with these data as well. The positions
below are nearly all from UCAC2 (for both epoch and equinox J2000),
and thus differ by a few arcsec mainly from proper motion, but also
from the systematic shift between the FK3 to the ICRS. In general the
spectral types are not present in SIMBAD or WEBDA.
I worked from Alain Fresneau's compilation for the field, which is
based largely on the Heckmann data (Cat. I/68). I ran those
coordinates into VizieR looking at UCAC2, Tycho-2, and the Fabricius
Tycho double-star catalogue (Cat. I/276). Coordinates for two
crowded stars were obtained from 2MASS. With one exception all the
stars were found quite close to the predicted positions. Close pairs
are indicated in the notes, as are stars with substantial proper
motion (≫0.1"/year).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 79 1221 Coordinates for stars in alpha Persei cluster,
version 25 Sep 2004
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See also:
I/68 : Positions and Proper Motions in alpha Per cluster (Fresneau, 1980)
J/A+A/395/813 : Alpha Per faint stars photometry (Barrado y Navascues+, 2002)
J/A+A/416/125 : RI photometry in alpha Per and Pleiades (Deacon+, 2004)
J/AN/319/201 : Alpha Per cluster low-mass members. I. (Prosser+, 1998)
J/AN/319/215 : Alpha Per cluster low-mass members. II. (Prosser+, 1998)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- --- [Cl Melotte 20]
15- 18 I4 --- Seq Heckmann's running number
21- 22 I2 h RAh Right ascension (J2000.0)
24- 25 I2 min RAm Right ascension (J2000.0)
27- 31 F5.2 s RAs Right ascension (J2000.0)
33 A1 --- DE- Declination sign (J2000.0)
34- 35 I2 deg DEd Declination (J2000.0)
37- 38 I2 arcmin DEm Declination (J2000.0)
40- 43 F4.1 arcsec DEs Declination (J2000.0)
45 A1 --- r_Pos [MTU] Position source (1)
47- 50 F4.1 mag pgmag Photographic magnitude
53- 55 A3 --- SpType Spectral type
60- 79 A20 --- Rem Remarks (by B. Skiff)
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Note (1): Position sources as follows:
M = 2MASS (Cat. II/246)
T = Tycho-2 (2000A&A...357..367H 2000A&A...357..367H, Cat. I/259)
U = UCAC2 (2004AJ....127.3043Z 2004AJ....127.3043Z, Cat. I/289)
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Acknowledgements: Brian Skiff, Brian.Skiff(at)lowell.edu
(End) Francois Ochsenbein [CDS] 03-Oct-2004