نتایج جستجو برای: star catalogue
تعداد نتایج: 88057 فیلتر نتایج به سال:
We are conducting a large survey of star formation within ∼ 400 nearby spiral and irregular galaxies through imaging of the Hα emission. We present here some of our first results from 104 of the galaxies in our sample, investigating the variation of SFR and Hα EWs along the Hubble sequence for these galaxies. We find a strong dependence of SFR on Hubble type, peaking for Sbc galaxies, but with ...
We present and discuss the criteria for selecting potential target stars suitable for the search for Earth-like planets, with a special emphasis on the stellar aspects of habitability. Missions that search for terrestrial exoplanets will explore the presence and habitability of Earth-like exoplanets around several hundred nearby stars, mainly F, G, K, and M stars. The evaluation of the list of ...
We have observed a magnitude-limited sample of 78 galaxies chosen from the Revised Shapley-Ames Catalogue with ISOCAM at 10 m and with ISOPHOT at 60 m, 100 m, and 180 m. We have complemented these data with images at JHK. We will compare the normalized intensity and distribution of mid-infrared and far-infrared emission from these galaxies to investigate the correlation of infrared activity wit...
Stellar Aspects of Habitability – Characterizing Target Stars for Terrestrial Planet Search Missions
In this paper we present and discuss the criteria for selecting potential target stars suitable for the search for Earth like planets, with a special emphasis on the stellar aspects of habitability. Missions that search for terrestrial exoplanets will explore the presence and habitability of Earth-like exoplanets around several hundred nearby stars, mainly F, G, K, and M stars. The evaluation o...
We present a new catalogue of symbiotic stars. In our list we include 188 symbiotic stars as well as 28 objects suspected of being symbiotic. For each star, we present basic observational material: coordinates, V and K magnitudes, ultraviolet (UV), infrared (IR), X-ray and radio observations. We also list the spectral type of the cool component, the maximum ionization potential observed, refere...
We report the discovery of a population of nearby, blue early-type galaxies with high star formation rates (0.5 < SFR < 50 M⊙yr). They are identified by their visual morphology as provided by Galaxy Zoo for SDSS DR6 and their u − r colour. We select a volume-limited sample in the redshift range 0.02 < z < 0.05, corresponding to luminosities of approximately L and above, and with u − r colours s...
Context. Determining the parameters of massive stars is crucial to understand many processes in galaxies and the Universe, since these objects are important sources of ionization, chemical enrichment and momentum. 10m class telescopes enable us to perform detailed quantitative spectroscopic analyses of massive stars in other galaxies, sampling areas of different metallicity. Relating the stars ...
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