2011
DOI: 10.1051/0004-6361/201015493
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Gemini GMOS spectroscopy of HeII nebulae in M 33

Abstract: We have carried out a narrow-band survey of the Local Group galaxy, M 33, in the HeII λ4686 emission line, to identify HeII nebulae in this galaxy. With spectroscopic follow-up observations, we confirm three of seven candidate objects, including identification of two new HeII nebulae, BCLMP651, HBW673. We also obtain spectra of associated ionizing stars for all the HII regions, identifying two new WN stars. We demonstrate that the ionizing source for the known HeII nebula, MA 1, is consistent with being the ea… Show more

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Cited by 55 publications
(70 citation statements)
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References 94 publications
(140 reference statements)
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“…As with the BHGs, LPV is present and observed in the Hβ line of J013341.28+302237.2 and the He i lines of J013416.07+303642.1 6 . Discovery and subsequent follow up spectra of both stars extend the baseline of observations to ≥17 yr for the former (Monteverde et al 1996, Ma07) and ≥18 yr for the latter (Spiller 1992;Corral 1996;Kehrig et al 2011), but provide no evidence for (LBV driven) secular evolution during these intervals. For completeness we note that Urbaneja et al (2005) prefer a classification of B1 Ia + for J013341.28+302237.2 (=[HS80] 110A) which they find to be a highly luminous object with a high mass loss rate in comparison to Galactic examples (Clark et al 2012); we return to this point in Sect.…”
Section: P Cygni Starsmentioning
confidence: 68%
“…As with the BHGs, LPV is present and observed in the Hβ line of J013341.28+302237.2 and the He i lines of J013416.07+303642.1 6 . Discovery and subsequent follow up spectra of both stars extend the baseline of observations to ≥17 yr for the former (Monteverde et al 1996, Ma07) and ≥18 yr for the latter (Spiller 1992;Corral 1996;Kehrig et al 2011), but provide no evidence for (LBV driven) secular evolution during these intervals. For completeness we note that Urbaneja et al (2005) prefer a classification of B1 Ia + for J013341.28+302237.2 (=[HS80] 110A) which they find to be a highly luminous object with a high mass loss rate in comparison to Galactic examples (Clark et al 2012); we return to this point in Sect.…”
Section: P Cygni Starsmentioning
confidence: 68%
“…This temperature is higher than measured in other H  regions with He  emission, making S3 the hottest H  region currently known in the Local Group (see Kehrig et al 2011, for an overview of known He  nebulae). This electron temperature is indicative for both the high temperature of the ionizing source, and the low-metallicity environment.…”
Section: Nebular Spectrummentioning
confidence: 75%
“…Although no convincing explanation for the origin of the He II emission has been found so far, these objects have indeed similar properties to our narrow He II emitters, and we can not exclude that they are all powered by the same mechanism. The fact that these objects are quite rare in the local Universe (Kehrig et al 2011;Shirazi & Brinchmann 2012) and more frequent in our sample at high redshift (3-5% depending on the possible He II class, see below) may simply reflect the evolution of the star-formation rate density of the Universe (that is at its peak around the median redshift of our galaxies) and the evolution of the average metallicity of the Universe.…”
Section: Discussionmentioning
confidence: 87%
“…For many of these regions the spectra show the features typical of W-R stars, which are thought to be the source of the strong ionizing continuum (see Sect. 4.2), but some are not clearly associated with W-R stars, nor with O-B stars (Kehrig et al 2011).…”
Section: Peculiar Stellar Populationsmentioning
confidence: 91%
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