Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....126..887m&link_type=abstract
The Astronomical Journal, Volume 126, Issue 2, pp. 887-892.
Astronomy and Astrophysics
Astronomy
10
Key Word: Ism: Planetary Nebulae: General, Stars: Agb And Post-Agb, Stars: Fundamental Parameters, Stars: Wolf-Rayet
Scientific paper
We present new spectroscopic data of 14 candidates for the weak emission-line type of central stars of planetary nebulae ([WELS]). With a medium resolution of about 2 Å, we confirmed the main spectral characteristics of these stars but found that two objects of our sample are in fact early-type [WC] ([WCE]) stars. The λ4650 and C IV λλ 5801, 5812 features are resolved, and they were used in a tentative classification. Based on the C IV lines the [WELS] stars of our sample can be divided qualitatively into two main groups: clear emission and very weak or no emission. We compared mean equivalent widths of carbon and oxygen lines of the [WELS] stars with those of the [WCE] and [WCL] types. The results are not conclusive but point in favor of an increase in temperature from [WCL] to [WCE], followed perhaps by a decrease from [WCE] to [WELS].
Based on observations made with the 1.52 m telescope at the European Southern Observatory (La Silla, Chile) under agreement with the Observatório Nacional, Brazil.
de Araújo Francisco Xavier
Marcolino Wagner L. F.
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