Other
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ycatp018563300r&link_type=abstract
VizieR On-line Data Catalog: J/other/IBVS/5633. Originally published in: 2005IBVS.5633....1R
Other
Stars: Variable
Scientific paper
In the recent IBVS 5633, Roslund et al. give a list of new red variable stars. The work evidently was done in the early 1970s, but no effort was made to match the star-list with recent data available from modern on-line resources in this late publication. Johnson R magnitudes at maximum are shown for all stars and spectral classifications for about half. The authors warn that the magnitudes could have a systematic error, such that they are perhaps a magnitude too bright overall. Similarly, the coordinates, given to arcsecond precision, are noted as being poorly determined with "a simple, unpretentious plate-measuring machine of unproven accuracy." I confirm here both of these problems.
I have gone through the list to recover the stars in modern catalogues. I matched the source-list in the Strasbourg VizieR utility against UCAC2 and 2MASS, searching a 20" radius and assuming the brightest red star in the region is the variable (typical J-K>>1.0). There are no identification charts published, so misidentifications are possible. However, the candidates are all very similar in near-IR brightness (commonly 7two full magnitudes too bright even accounting for the large amplitudes of the variables---the zero-point is nearly that of the USNO-B1.0 or DENIS I-band magnitudes, rather than R.
Finally, I matched the stars with the MSX6C and IRAS catalogues and also GCVS v4.2. Most stars have an MSX link, but probably the bright IR background close to the galactic center precluded many IRAS detections. I also searched each position in SIMBAD (3' search radius): the stars with Terzan links are shown, but the rest of the stars are not present in the database.
Please note the following: where no reasonably bright red star appeared near the Roslund position on 2MASS J-band images, I used the identifications with the Terzan survey of the same region to obtain improved positions. This allowed all but one star to be recovered unambiguously.
(1 data file).
Larsson Anders
Radbo M.
Roslund Curt
Schalander P.
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