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- W3405327 abstract "Despite the great progress made in the last decade, the study of very massive stars remains hampered by the lack of statistics and only a few hundred stars with Minit≥30 M⊙ are known in our Galaxy. Low resolution, slitless spectral images were obtained at the Loiano Observatory in the wavelength window 3300–6420 A, in order to identify in extragalactic objects targets displaying the most prominent features that characterise the spectrum of bright hot stars, WR and Luminous Blue Variables (LBV), and of nebular regions as well. We present the results with the well studied galaxy M 101, where the previously known H ii regions with WR star signatures are easily identified. Polcaro & Viotti (1998) proposed at the ADASS VII Conference a simple slitless spectroscopic method that was effectively employed in the search of very massive stars, as well as in the identification of the optical counterparts of galactic X–ray sources (see e.g. Bernabei & Polcaro 2001a,b; Israel et al. 1999). In this regard, despite of the great progress made in the last decade, the study of the very massive stars remains hampered by the lack of statistics and only a few hundred stars with Minit≥30 M⊙ are known in our Galaxy. Actually, being short–living objects, the known very massive stars are associated with regions of large interstellar extinction, hence they are not easy to identify in our Galaxy. In fact, many the known objects of this category have been found in external galaxies and in the Magellanic Clouds. For instance, only one half of the LBVs known to date are Galactic objects. On the other hand, the new generation of optical telescopes makes the spectroscopy of bright extragalactic stars a relatively easy job: therefore, we can hope to increase our knowledge of very massive objects from the study of this class of stars in nearby external galaxies seen ‘face–on’, that is with a little interstellar matter interposed. However, the problem arises in the preliminary identification of the targets: very massive stars are difficult to identify on the base of photometric surveys alone, being their colours strongly affected by local and circumstellar reddening. Unfortunately, the method that we have employed to date for the search of galactic objects, is scarcely useful, being based on a combination of filters and grisms, suitable only for relatively bright objects (our sensitivity limits is of the order of V≈14). Because of these reasons, we developed a new slitless procedure, allowing the spectroscopic survey of a relatively wide sky region on a single image, using" @default.
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- W3405327 date "2004-07-01" @default.
- W3405327 modified "2023-09-24" @default.
- W3405327 title "Catch the Biggest Ones: Slitless Spectroscopy of Extragalactic Objects" @default.
- W3405327 hasPublicationYear "2004" @default.
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