منابع مشابه
Lick Spectral Indices for Super Metal-rich Stars
We present Lick spectral indices for a complete sample of 139 candidate super metal-rich stars of different luminosity class (MK type from V to I). For 91 of these stars we were able to identify, in an accompanying paper (Malagnini et al. 2000), the fundamental atmosphere parameters. This confirms that at least 2/3 of the sample consists of stars with [Fe/H] in excess of +0.1 dex. Optical indic...
متن کاملHigh-resolution IR and radio observations of AGB stars
Aims. We present the results of observations with interferometers of a sample of pulsating asymptotic giant branch (AGB) stars in the infrared and at radio wavelengths. The goal of these observations is to explore the extended stellar atmospheres and to establish links between the spatial scales of molecular envelopes and of the dust shell. This is the key to better understand the process of du...
متن کاملRadio observations of IRAS selected southern hemisphere classical Be stars
We present the first radio observations of a sample of 13 optically and IR bright southern hemisphere classical Be stars made from the Australian Telescope Compact Array at 3.5cm and 6.3cm simultaneously. One star, δ Cen was detected at 3.5cm and a second, µ Cen was also thought to have been detected; further observations of this source are required to confirm this detection. No sources were de...
متن کاملA spatial study of the mid-IR emission features in four Herbig Ae/Be stars
Context. Infrared (IR) spectroscopy and imaging provide a prime tool to study the characteristics of polycyclic aromatic hydrocarbon (PAH) molecules and the mineralogy in regions of star formation. Herbig Ae/Be stars are known to have varying amounts of natal cloud material present in their vicinity. Aims. Our aim is to study the characteristics of the mid-IR emission originating in Herbig Ae/B...
متن کاملSuperwind in evolved OH/IR stars
We report observations of 13CO (J=1–0) and (J=2– 1) emission towards 5 evolved OH/IR envelopes. Four of them are known to have very weak CO emission compared to their infrared flux, and an anomalously high (J=2–1)/(J=1–0) intensity ratio. Modeling of their 12CO and 13CO lines is used to test several possible explanations of this behaviour. We conclude that it is most likely due to the recent on...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1994
ISSN: 0074-1809
DOI: 10.1017/s0074180900215581