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[vsnet-id 55] Westerlund LF1 revision
- Date: Wed, 10 Mar 1999 14:24:42 -0700
- To: borde@dasgal1.obspm.fr, buscombe@nwu.edu, francois@simbad.u-strasbg.fr, vsnet-id@kusastro.kyoto-u.ac.jp
- From: bas@lowell.Lowell.Edu (Brian Skiff)
- Subject: [vsnet-id 55] Westerlund LF1 revision
- Sender: owner-vsnet-id@kusastro.kyoto-u.ac.jp
As part of work identifying variables in Aquila, I have gone over an
early list of mine that provides coordinates and IDs for 478 M giants found on
far-red plates by Westerlund in the Case LF1 region. The coordinates were
originally obtained by measuring photocopies of the source charts on our PDS
machine together with PPM stars as were available (about a dozen per field).
This yielded positions good to some arcseconds, from which I tried to make
IRAS IDs. It was not convenient at the time (and still isn't!) to examine
the POSS-I and POSS-II plates to verify the identification of each as a red
star; the USNO-A catalogues had not been built at that time (1994). Thus
some uncertainty remained about the results. Westerlund's charts are none too
clear, so this has not helped.
I have now checked the list against sky-survey images in doubtful cases,
and have replaced the positions with those on the ICRS as far as possible.
This leads to minor changes (less than 3") in most cases simply from the
different catalogues used. In a number of cases the stars have been positively
identified for the first time and substantial changes (in the 15"-30" range)
have been made. I have matched the list anew against the GCVS, IRAS, and ACT
using VizieR. There are still some ambiguous cases, given the Notes.
Column 's' gives the source of the positions as follows: A = USNO-A2.0,
G = GSC v1.2 (not v1.1), S = SkyView (+/- 2"), T = ACT. The column 'mi' shows
the infrared (roughly I band) magnitude estimates made by Westerlund. All the
stars will be variable to some degree of course. For instance, while verifying
the location of LF 1 B 132, by comparing the POSS-I and POSS-II images it was
easy to discern that it has a full amplitude of at least 2 magnitudes in the
red.
All the stars were added to SIMBAD using the original "soft" positions by
Francois Ochsenbein during my summer 1995 visit to the CDS-Strasbourg. The
data in this revision should be much more reliable.
A sample of the list is shown below; the complete version (35Kb) is at:
http://ftp.lowell.edu/pub/bas/starcats/lf1ir.fil
Among other things, the list will help nail down variables appearing in at
least two lists by Hoffmeister (AN 288 and 289) in these incredibly crowded
star fields.
\Brian
============================
source: 1959ApJ...130..178W
WESTERLUND B.
Astrophys. J., 130, 178-192 (1959)
An infrared survey of a region in Aquila.
version: 10 March 1999
LF 1 RA (2000) Dec s GSC IRAS mi spec Remarks
A 1* 19 33 07.8 +5 01 46 T 0486-5075 19306+0455 M3 V1293 Aql
A 2 19 33 35.0 +5 01 09 A 0486-3748 11.7 M2
A 3 19 31 15.2 +5 20 56 A 12.6 M4
A 4 19 31 26.8 +5 20 37 A 0486-0794 12.0 M3:
A 5 19 33 53.4 +5 01 16 A 13.0 M7: NSV 12147
A 6 19 31 04.8 +5 24 11 A 0486-1076 9.1 M6
A 7 19 34 19.3 +4 59 26 A 12.5 M3
A 8 19 32 05.2 +5 18 29 A 12.0 M4
A 9 19 31 13.5 +5 27 10 A 0486-0847 11.1 M6
A 10 19 32 23.0 +5 19 32 S 12.1 M4
A 11 19 32 04.4 +5 22 24 A 0486-2737 11.2 M2
A 12* 19 31 35.0 +5 28 04 G 0486-0890 11.7 S:
A 13 19 34 06.1 +5 09 19 A 12.5 M5
A 14 19 32 31.8 +5 25 24 A 19300+0518 11.0 M6.5 NSV 12120
A 15 19 33 26.7 +5 19 35 A 11.9 M7 NSV 12140
A 16 19 34 17.9 +5 13 32 A 11.0 M6
A 17* 19 33 44.3 +5 18 46 T 0486-2623 19312+0512 8.2 M3
A 18 19 32 53.7 +5 25 54 A 12.5 M2:
A 19 19 33 37.5 +5 20 42 A 0486-4208 9.9 M2
A 20 19 34 40.2 +5 12 55 S 12.6 M3
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