Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...332..523w&link_type=abstract
Astronomy and Astrophysics, v.332, p.523-525 (1998)
Astronomy and Astrophysics
Astrophysics
1
Galaxies: Individual Cas 1, Galaxies: Irregular, Galaxies: Ism, Galaxies: Dwarf
Scientific paper
In recent years several dwarf galaxies belonging to the highly obscured Maffei-IC 342 group have been discovered. Due to its shape, colour and the presence of a few possible Hii regions, one of these objects (l =3D 129fdg6 , b =3D +7fdg1 ) was suspected to be a dwarf irregular galaxy, named Cas 1. We have obtained optical spectra of the brightest Hii candidate in Cas 1. By using the H_alpha /H_beta emission line ratio we could, for the first time, determine a rather reliable foreground extinction of A_V =3D 2.5 mag and thus cannot support Tikhonov's (1996) view that Cas 1 is a member of the Local Group. For [Oiii](5007 Angstroms)/H_beta we obtained a ratio of 2.6, much higher than typical ratios for (galactic) Hii regions. The nature of the emitting nebula is unclear: a supernova remnant seems to be implausible (there is an IRAS counterpart), but we might deal with an Hii region, possibly excited by a WR star.
Saurer W.
Weinberger Ram
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