Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.2101s&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 107, no. 6, p. 2101-2107
Astronomy and Astrophysics
Astronomy
11
Cosmic Dust, Open Clusters, Stellar Evolution, Stellar Spectrophotometry, Charge Coupled Devices, Interstellar Extinction
Scientific paper
While performing galactic and extragalactic studies near the galactic plane in Cepheus Charge Coupled Device (CCD) frames in B, V, and R were taken of the faint (V greater than or equal to 16m) previously unstudied open star cluster Berkeley 93 (Be 93). Our results indicate that this object is the core of a larger aggregate, is slightly evolved, strongly reddened (EB - V approximately equal to 1.5), and shows a pronounced variable reddening that is probably due to the location of the cluster inside (near the border) a dust cloud. By far the reddest, and obviously most evolved star is a (variable) carbon star that -- because of its reddening and location -- appears to be a cluster member. We present arguments in favor of a large distance of more than 5 kpc for Be 93 which possibly belongs to the galactic warp. As an addendum, we present six star concentrations discovered on the POSS or European Southern Observatory (ESO) SERC atlas that might represent hitherto uncatalogued open star clusters of 'Berkeley type'.
Saurer W.
Seeberger Robert
Weinberger Ram
Ziener Rainer
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